CN208366882U - A kind of microchannel nano-fluid enhanced heat exchange experiment test device - Google Patents
A kind of microchannel nano-fluid enhanced heat exchange experiment test device Download PDFInfo
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- CN208366882U CN208366882U CN201820976593.9U CN201820976593U CN208366882U CN 208366882 U CN208366882 U CN 208366882U CN 201820976593 U CN201820976593 U CN 201820976593U CN 208366882 U CN208366882 U CN 208366882U
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Abstract
The utility model discloses a kind of microchannel nano-fluid enhanced heat exchange experiment test device, the microchannel nano-fluid enhanced heat exchange experiment test device includes that fluid reservoir, coil heater, fluid supply control group, microchannel box group, DC power supply, DATA REASONING analysis group and liquid collecting fill.The different Thermal Performance of Micro Channels modules of microchannel box group, tested Thermal Performance of Micro Channels module can be mounted between two fin of upper cover plate between two fin of lower plate in advance, then front side board, back side panel, left plate and the right side plate of assembled microchannel box group, microchannel box group is constituted, reduces the inconvenience that assembles in short space of micro-structure and because assembling bring systematic error.
Description
Technical field
The utility model relates to a kind of test devices.Specifically a kind of microchannel nano-fluid enhanced heat exchange test is surveyed
Trial assembly is set.
Background technique
In recent years, with the development of science and technology the fields such as electronics, machinery are all developed towards the direction of miniaturization, micromation, just
Effects, the research and development of microchannel such as scale miniaturization, structure and the complicated condition of Mass and heat transfer process, which must be taken into consideration, to be become
Current hot spot.The problems such as influence of the nano-fluid to Thermal Performance of Micro Channels, influence of the microchannel structure to its heat transfer effect also by
Gradually receive the concern and attention of people.
People are to different nano-fluids to the heat exchange efficiency of different microchannel structure and size, the shadow of heat exchange amount at present
It rings and has carried out to study extensive.But since microchannel size is small, the connection mass transfer, temperature control, flow control, the detection and analysis dress that need
Set it is more, during the experiment, for variety classes, the nano-fluid of variable grain diameter, microchannel structure snd size, and
Repeated disassembled and assembled mass transfer, temperature control, flow control, detection and analysis device are wanted in the research of the parameters such as flow velocity, temperature, the concentration of nano-fluid,
Inconvenience is brought to the operation of experimenter, increases the uncertain factor of experiment condition, result of study is made to there is very big mistake
Difference has severely impacted the repeatability and consistency of test result.
Microchannel test is all to be prepared into single volume very by the method for etching and suppressing adhesion in previous test
Small integrated microchannel assembly (also with other complicated connection and sealing structures), is only used for a microchannel structure
Different tests condition verification experimental verification.If wanting repeated measurement or replacement core microchannel module, very high cost is needed.
Utility model content
For this purpose, the technical problem to be solved by the utility model is to provide a kind of microchannel nano-fluid reinforcingization heat examinations
Test detection device.
In order to solve the above technical problems, the utility model provides the following technical solutions:
A kind of microchannel nano-fluid enhanced heat exchange experiment test device, the microchannel nano-fluid enhanced heat exchange test
Test device includes fluid reservoir, coil heater, fluid supply control group, microchannel box group, DC power supply, DATA REASONING point
Analysis group and liquid collecting fill；In the coil heater is located in the fluid reservoir, the fluid reservoir, fluid supply control
Group, the microchannel box group and the liquid collecting fill between successively fluid communication；The DC power supply and microchannel box group electricity
Connection；The DATA REASONING analysis group includes optical data collection instrument, data collecting instrument, synchronizer, hydraulic pressure and temperature measurement member
Part and data analyzer, the hydraulic pressure and temperature-measuring element include inlet temperature sensor, import hydraulic pressure sensor, outlet temperature
Degree sensor, outlet hydraulic pressure sensor and for measure the flowmeter for flowing through the fluid and supplying control group fluid flow, it is described
The output end of inlet temperature sensor, the output end of the import hydraulic pressure sensor, the outlet temperature sensor output end,
The output end of the outlet hydraulic pressure sensor and the output end of the flowmeter connect with the input terminal of the data collecting instrument respectively
It connects；The inlet temperature sensor and the import hydraulic pressure sensor are located at the input end of the microchannel box group, the outlet
Temperature sensor and outlet hydraulic pressure sensor are located at the outlet end of the microchannel box group；The optical data collection instrument includes aobvious
Micro mirror, video camera and infrared thermal imager, the video camera are mounted on the microscope, the microscope and the infrared heat
Imager is located at the front and back of the microchannel box group；It is the time signal output end of the video camera, described infrared
The data output end of the time signal output end of thermal imaging system and the data collecting instrument input terminal with the synchronizer respectively
Connection, the image signal output end and the synchronizer of the image signal output end of the video camera, the infrared thermal imager
Data output end connect respectively with the input terminal of the data analyzer.
Above-mentioned microchannel nano-fluid enhanced heat exchange experiment test device, fluid supply control group include water pump,
First filter, regulating valve and the second filter, the water pump, the first filter, the regulating valve and second mistake
Successively fluid communication between filter；The flowmeter is arranged on the pipeline between the first filter and the regulating valve,
And the arrival end fluid communication with the outlet end of first filter and the regulating valve；The outlet end of the fluid reservoir and the water
The arrival end fluid communication of pump；The arrival end fluid communication of the outlet end of second filter and the microchannel box group.
Above-mentioned microchannel nano-fluid enhanced heat exchange experiment test device, the microchannel box group include upper cover plate, under
Bottom plate, left plate, right side plate, front side board and back side panel；The left plate and the right side plate respectively it is fixed be bonded in it is described under
The left and right side of bottom plate, the front side board and the back side panel fixed front side for bonding the lower plate and rear side respectively, it is described on
Cover board is located at the upper surface of the left plate, the right side plate, the front side board and the back side panel, and is detachably connected described
The upper surface of left plate, the right side plate, the front side board and the back side panel.
Above-mentioned microchannel nano-fluid enhanced heat exchange experiment test device, the bottom surface of the upper cover plate have upper left fin
With upper right fin；There are lower-left fin and bottom right fin in the upper surface of the lower plate, and the upper left fin is located at lower-left fin
Surface, the upper right fin are located at the surface of bottom right fin；The upper left fin and the upper right fin are in inverted concave knot
Structure, the lower-left fin and the bottom right fin present convex structure, the inverted concave structure of the upper left fin with it is described
The inverted concave structure of the convex-shaped structure male-female engagement of lower-left fin and the upper right fin and the bottom right fin
It is solid for the left fixed gap of microchannel structure of 1-2mm and the microchannel structure right side to be respectively formed height for convex-shaped structure male-female engagement
Determine gap.
Above-mentioned microchannel nano-fluid enhanced heat exchange experiment test device, the upper cover plate left side, the lower plate
Left side, the left plate, the front side board left side, the back side panel left side, the upper left fin and lower-left fin it
Between surround the first cavity；The upper cover plate, the lower plate, the upper left fin, the upper right fin, the lower-left fin and
The second cavity is surrounded between the bottom right fin；The upper cover plate right side, the lower plate right side, front side board right side
Third cavity is surrounded between portion, the back side panel right side, the upper right fin, the bottom right fin and the right side plate；Institute
Outlet end, first cavity, second cavity, the third cavity and the liquid collecting filling for stating the second filter are successively flowed
Body conducting；Spoiler is provided in first cavity and the third cavity；First cavity and second cavity it
Between pass through the left fixed interstitial fluids conducting of the microchannel structure；By described between second cavity and the third cavity
The right fixed interstitial fluids conducting of microchannel structure.
Above-mentioned microchannel nano-fluid enhanced heat exchange experiment test device is provided in the plate face of the left plate described
The circular cross section inlet port of microchannel box group, circular cross section inlet port are threaded hole, and threaded hole nominal diameter is M8, the right side
The circular cross section outlet of the microchannel box group is provided in the plate face of plate, circular cross section outlet is threaded hole, threaded hole
Nominal diameter is M8, and the outlet end of second filter passes through the circular cross section inlet port and described first on the left plate
Cavity fluid communication, the circular cross section outlet on the right side plate fill fluid communication with the liquid collecting；The front side board just
To offering threaded hole in the plate face of first cavity, and the import hydraulic pressure sensing is installed in threaded hole screw-internal thread fit
Device, threaded hole nominal diameter are M12, and the plate face of the third cavity described in the front side board face offers threaded hole, and in spiral shell
Pit screw-internal thread fit installs the outlet hydraulic pressure sensor, and threaded hole nominal diameter is M12；Described in the front side board face
The plate face of two cavitys offers installation gap；The plate face of the first cavity described in the back side panel face offers threaded hole, and
The inlet temperature sensor is installed in threaded hole screw-internal thread fit, threaded hole nominal diameter is M12, the back side panel just
To offering threaded hole in the plate face of the third cavity, and the outlet temperature sensing is installed in threaded hole screw-internal thread fit
Device, threaded hole nominal diameter are M12；4 threaded holes, spiral shell are offered in the plate face of the second cavity described in the upper cover plate face
Pit nominal diameter is M12；4 threaded holes, threaded hole are offered in the plate face of the second cavity described in the lower plate face
Nominal diameter is M12.
Above-mentioned microchannel nano-fluid enhanced heat exchange experiment test device, a length of 136mm of the upper cover plate, width are
40mm；The upper cover plate plate face at the top of the upper cover plate board thickness, the third cavity at the top of first cavity is thick
Degree, the lower plate board thickness of first cavity bottom, the lower plate board thickness of the third cavity bottom,
The front side board board thickness, the back side panel board thickness, the left plate board thickness and the right side plate) board thickness
It is 8mm, the lower plate of the upper cover plate board thickness and second cavity bottom at the top of second cavity
Board thickness is 6mm；The fin of the upper left fin and the upper right fin is with a thickness of 8mm, the left side of the upper left fin
Face is 40mm at a distance from the left side of upper cover plate, the left side of the right side of the upper left fin and the upper right fin away from
From for 40mm, the right side of the upper right fin is 40mm at a distance from the right side of the upper cover plate；The inverted concave structure
Width with the convex-shaped structure be 20mm, the inverted concave structure depth be 6mm；The lower plate it is a length of
The fin of 120mm, width 40mm, the lower-left fin and the bottom right fin with a thickness of 8mm, lower-left fin left side with
The distance of the left side of the lower plate is 32mm, the left side of the right side of the lower-left fin and the bottom right fin away from
From for 40mm, the right side of the bottom right fin is 32mm at a distance from the lower plate right side；The left plate and right side
The height of plate is that the width of 30mm, the left plate and right side plate are 40mm, the center of circle of the circular cross section inlet port with
The center of circle of distance and the circular cross section outlet of the left plate bottom surface is at a distance from the right side plate bottom surface
19mm, the center of circle of the circular cross section inlet port are located at the transverse center of the left plate, the circle of the circular cross section outlet
The heart is located at the transverse center of the right side plate, a length of 136mm of the front side board and the back side panel, width 38mm；Installation institute
Import hydraulic pressure sensor (13) and the threaded hole center of circle for exporting hydraulic pressure sensor are stated at a distance from the front side board lower end surface
Be 19mm, install the inlet temperature sensor and the outlet temperature sensor the threaded hole center of circle and the back side panel
The distance of lower end surface is 19mm, installs the threaded hole center of circle of the import hydraulic pressure sensor and the left side of the front side board
Distance is 23mm, and the threaded hole center of circle for installing the outlet hydraulic pressure sensor is at a distance from the right side of the front side board
23mm, the threaded hole center of circle for installing the inlet temperature sensor is 23mm at a distance from the left side of the back side panel, installation
The threaded hole center of circle of the outlet temperature sensor is 23mm at a distance from the right side of the back side panel.
Above-mentioned microchannel nano-fluid enhanced heat exchange experiment test device, is equipped with microchannel in second cavity
The fluid inlet end of heat exchange module, the Thermal Performance of Micro Channels module is located in the left fixed gap of the microchannel structure, described micro-
The fluid inlet end of channel for heat exchange module is located in the right fixed gap of the microchannel structure；The Thermal Performance of Micro Channels module includes
Permanent wall temperature Thermal Performance of Micro Channels module and constant heat flow Thermal Performance of Micro Channels module.
Above-mentioned microchannel nano-fluid enhanced heat exchange experiment test device, the perseverance wall temperature Thermal Performance of Micro Channels module include
Microchannel structure and condensation head, the condensation head are located on the upper surface of the microchannel structure, the microchannel structure
Left end tight fit be mounted in the left fixed gap of the microchannel structure, the right end tight fit of the microchannel structure is mounted on
In the right fixed gap of microchannel structure.
Above-mentioned microchannel nano-fluid enhanced heat exchange experiment test device, the constant heat flow Thermal Performance of Micro Channels module include
Microchannel structure, Electric radiant Heating Film and plastic heat shield, the Electric radiant Heating Film are located at the upper surface of microchannel structure, the plastic heat shield
Positioned at the upper surface of the Electric radiant Heating Film；The left end tight fit of the microchannel structure is mounted on the left fixed seam of the microchannel structure
In gap, the right end tight fit of the microchannel structure is mounted in the right fixed gap of the microchannel structure；The Electric radiant Heating Film
Current output terminal and current input terminal are connected with the input terminal of DC power supply and output end respectively；The lower plate is located at the left side
Between side plate, the right side plate, the front side board and the back side panel, and the lower surface of the lower plate, the left plate
Lower end surface, the right side plate lower end surface, the front side board lower end surface are concordant with the back side panel lower end surface, the lower plate
Four sides and the inside plate face fluid-tight of the left plate, the right side plate, the front side board and the back side panel bond, institute
It states upper cover plate to be clamped between the front side board and the inside plate face of the back side panel, and the left end of the upper cover plate is pressed on
On the upper surface of the left plate, the right end of the upper cover plate is pressed on the upper surface of the right side plate；The upper left fin,
The width of the upper right fin, the lower-left fin and the bottom right fin is 40mm, the upper left fin, the upper right rib
Piece, the lower-left fin and the bottom right fin are clamped between the front side board and the inside plate face of the back side panel.
Beneficial effect
1. tested Thermal Performance of Micro Channels module can be mounted on by the different Thermal Performance of Micro Channels modules of microchannel box group in advance
Between two fin of cover board between two fin of lower plate, then front side board, back side panel, left plate and the right side of assembled microchannel box group
Plate constitutes microchannel box group, reduces the inconvenience that assembles in short space of micro-structure and because assembling bring systematic error, examination
Error analysis is carried out for coefficient of heat transfer h during testing, error is lower than 8.37%.
2. opening up fluted on the front side board of microchannel box group, multiple threaded holes are offered on upper cover plate and lower plate, it can
It is entire without dismounting to realize the debugging during testing to Thermal Performance of Micro Channels module by groove and multiple threaded holes
Microchannel box group, it is easy to operate, decrease shadow of the systematic error to test result of disassembly process bring microchannel box group
It rings.
3. the size and structure of fin on the upper cover plate for passing through change microchannel box group, thus it is possible to vary upper cover plate and lower plate
The gap of cooperation between fin, to cooperate the Thermal Performance of Micro Channels module of different sizes and various heat exchange mode.
4. the utility model microchannel nano-fluid enhanced heat exchange experiment test device is detachable, replaceable adjusting microchannel
Structure can be adapted for two kinds of test patterns of permanent wall temperature and constant heat flow and be applicable to the measurement of different microchannel structure, reduce
The cost of experiment；Compared to traditional integrated microchannel assembly that is made, the utility model can be by original each microchannel
Structured testing establishment of component and measurement cost are reduced to the 100 yuan or less (valences without microchannel structure itself by 500 yuan or more
Lattice).
Detailed description of the invention
The microchannel nano-fluid reinforcing of Fig. 1 the utility model microchannel nano-fluid enhanced heat exchange experiment test device is changed
Heat test schematic structural diagram of testing device；
The microchannel box group of Fig. 2 the utility model microchannel nano-fluid enhanced heat exchange experiment test device faces graph structure
Schematic diagram；
The microchannel box group of Fig. 3 the utility model microchannel nano-fluid enhanced heat exchange experiment test device overlooks graph structure
Schematic diagram；
The microchannel box group side view graph structure of Fig. 4 the utility model microchannel nano-fluid enhanced heat exchange experiment test device
Schematic diagram；
The microchannel box group upper cover plate side view of Fig. 5 the utility model microchannel nano-fluid enhanced heat exchange experiment test device
Figure structure schematic representation；
The microchannel box group lower plate side view of Fig. 6 the utility model microchannel nano-fluid enhanced heat exchange experiment test device
Figure structure schematic representation；
The permanent wall temperature Thermal Performance of Micro Channels module of Fig. 7 the utility model microchannel nano-fluid enhanced heat exchange experiment test device
Structural schematic diagram；
The constant heat flow Thermal Performance of Micro Channels module of Fig. 8 the utility model microchannel nano-fluid enhanced heat exchange experiment test device
Structural schematic diagram；
The front side of the microchannel box group of Fig. 9 the utility model microchannel nano-fluid enhanced heat exchange experiment test device is hardened
Structure schematic diagram；
The back side panel of the microchannel box group of Figure 10 the utility model microchannel nano-fluid enhanced heat exchange experiment test device
Structural schematic diagram；
The left plate of the microchannel box group of Figure 11 the utility model microchannel nano-fluid enhanced heat exchange experiment test device
Structural schematic diagram；
The upper cover plate of the microchannel box group of Figure 12 the utility model microchannel nano-fluid enhanced heat exchange experiment test device
Structural schematic diagram；
The lower plate of the microchannel box group of Figure 13 the utility model microchannel nano-fluid enhanced heat exchange experiment test device
Structural schematic diagram；
The different cross wall temperature of Figure 14 the utility model microchannel nano-fluid enhanced heat exchange testing method exchange heat Q
With the influence diagram of coefficient of heat transfer h；
The horizontal hot-fluid of difference of Figure 15 the utility model microchannel nano-fluid enhanced heat exchange testing method exchanges heat Q
With the influence diagram of coefficient of heat transfer h；
The nano-fluid difference entrance stream of Figure 16 the utility model microchannel nano-fluid enhanced heat exchange testing method
The influence diagram of speed exchange heat Q and coefficient of heat transfer h；
The nano-fluid different Reynolds number of Figure 17 the utility model microchannel nano-fluid enhanced heat exchange testing method
Exchange the influence diagram of heat Q and coefficient of heat transfer h；
The different nano-fluid heat exchangings of Figure 18 the utility model microchannel nano-fluid enhanced heat exchange testing method
Measure the influence diagram of Q and coefficient of heat transfer h；
The various concentration nano-fluid pair of Figure 19 the utility model microchannel nano-fluid enhanced heat exchange testing method
The influence diagram of heat exchange amount Q and coefficient of heat transfer h；
The microchannel number of Figure 20 the utility model microchannel nano-fluid enhanced heat exchange testing method exchanges heat Q
With the influence diagram of coefficient of heat transfer h；
The microchannel caliber heat exchanging amount Q of Figure 21 the utility model microchannel nano-fluid enhanced heat exchange testing method
With the influence diagram of coefficient of heat transfer h；
Appended drawing reference indicates in figure are as follows:
1: fluid reservoir, 2: coil heater, 3: microchannel box group, 4: DC power supply, 5: liquid collecting fills, 6 data collecting instruments,
7: data analyzer, 8: water pump, 9: first filter, 10: regulating valve, 11: the second filters, 12: inlet temperature sensor,
13: import hydraulic pressure sensor, 14: outlet temperature sensor, 15: outlet hydraulic pressure sensor, 16: flowmeter, 17: video camera, 18:
Infrared thermal imager, 19: microscope, 20: synchronizer, 3-1: upper cover plate, 3-2: lower plate, 3-3: left plate, 3-4: right side plate,
3-5: front side board, 3-6: back side panel, 3-7: upper left fin, 3-8: upper right fin, 3-9: lower-left fin, 3-10: bottom right fin, 3-
11: Thermal Performance of Micro Channels module, 3-12: microchannel structure；3-13: condensation head, 3-14: Electric radiant Heating Film, 3-15: plastic heat shield；
3-A: the first cavity, the 3-B: the second cavity, 3-C: third cavity；3-16: the left fixed gap of microchannel structure, 3-17: microchannel
The right fixed gap of structure, 3-18: installation gap, 3-19: inverted concave structure, 3-20: convex-shaped structure.
Specific embodiment
As shown in figures 1 and 3, a kind of microchannel nano-fluid enhanced heat exchange experiment test device is described micro- logical
Road nano-fluid enhanced heat exchange experiment test device includes fluid reservoir 1, coil heater 2, fluid supply control group, microchannel
Box group 3, DC power supply 4, DATA REASONING analysis group and liquid collecting fill 5；The coil heater 2 is located in 1 in the fluid reservoir,
The fluid reservoir 1, fluid supply control group, the microchannel box group 3 and the liquid collecting fill between 5 successively fluid communication；
The DC power supply 4 is electrically connected with the microchannel box group 3；The DATA REASONING analysis group includes optical data collection instrument, number
According to Acquisition Instrument 6, synchronizer 20, hydraulic pressure and temperature-measuring element and data analyzer 7, the hydraulic pressure and temperature-measuring element include
Inlet temperature sensor 12, outlet temperature sensor 14, exports hydraulic pressure sensor 15 and for measuring at import hydraulic pressure sensor 13
Flow through the flowmeter 16 of fluid supply control group fluid flow, the output end of the inlet temperature sensor 12, it is described into
The output end of saliva pressure sensor 13, the outlet temperature sensor 14 output end, it is described outlet hydraulic pressure sensor 15 it is defeated
The output end of outlet and the flowmeter 16 is connect with the input terminal of the data collecting instrument 6 respectively；The inlet temperature sensing
Device 12 and the import hydraulic pressure sensor 13 are located at the input end of the microchannel box group 3,14 He of outlet temperature sensor
Outlet hydraulic pressure sensor 15 is located at the outlet end of the microchannel box group 3；The optical data collection instrument includes microscope 19, takes the photograph
As instrument 17 and infrared thermal imager 18, the video camera 17 is mounted on the microscope 19, the microscope 19 and described red
Outer thermal imaging system 18 is located at the front and back of the microchannel box group 3；The time signal output end of the video camera 17,
The data output end of the time signal output end of the infrared thermal imager 18 and the data collecting instrument 6 respectively with it is described synchronous
The input terminal of device 20 connects, and the image signal output end of the video camera 17, the picture signal of the infrared thermal imager 18 are defeated
The data output end of outlet and the synchronizer 20 is connect with the input terminal of the data analyzer 7 respectively.
The fluid supply control group includes water pump 8, first filter 9, regulating valve 10 and the second filter 11, the water
Pump 8, the first filter 9, successively fluid communication between the regulating valve 10 and second filter 11；The flow
Meter 16 is arranged on the pipeline between the first filter 9 and the regulating valve 10, and the outlet end with first filter 9
With the arrival end fluid communication of the regulating valve 10；The outlet end of the fluid reservoir 1 and the arrival end fluid of the water pump 8 are led
It is logical；The arrival end fluid communication of the outlet end of second filter 11 and the microchannel box group 3.
As shown in Figures 2 to 4, the microchannel box group 3 includes upper cover plate 3-1, lower plate 3-2, left plate 3-3, right side
Plate 3-4, front side board 3-5 and back side panel 3-6；Fixation is bonded in the bottom to the left plate 3-3 and right side plate 3-4 respectively
The left and right side of plate 3-2, the front side board 3-5 and back side panel 3-6 fix the front side for bonding the lower plate 3-2 with after respectively
Side, the upper cover plate 3-1 are located at the left plate 3-3, the right side plate 3-4, the front side board 3-5 and the back side panel 3-6
Upper surface, and be detachably connected the left plate 3-3, the right side plate 3-4, the front side board 3-5 and the back side panel 3-6
Upper surface.
The bottom surface of the upper cover plate 3-1 has upper left fin 3-7 and upper right fin 3-8；The upper table of the lower plate 3-2
There are lower-left fin 3-9 and bottom right fin 3-10 in face, and the upper left fin 3-7 is located at the surface of lower-left fin 3-9, the upper right
Fin 3-8 is located at the surface of bottom right fin 3-10；The upper left fin 3-7 and upper right fin 3-8 is in inverted concave structure
3-19, the lower-left fin 3-9 and the bottom right fin 3-10 present convex structure 3-20；The upper left fin 3-7's is described
The convex-shaped structure 3-20 male-female engagement and the upper right fin 3-8 of inverted concave structure 3-19 and the lower-left fin 3-9
The inverted concave structure 3-19 and the bottom right fin 3-10 convex-shaped structure 3-20 male-female engagement, be respectively formed height be
The left fixed gap 3-16 of the microchannel structure of the 1-2mm and right fixed gap 3-17 of microchannel structure.
The left side the upper cover plate 3-1, the left side the lower plate 3-2, the left plate 3-3, the front side board 3-5 are left
The first cavity 3-A is surrounded between side, the left side the back side panel 3-6, the upper left fin 3-7 and lower-left fin 3-9；Institute
State upper cover plate 3-1, the lower plate 3-2, the upper left fin 3-7, the upper right fin 3-8, the lower-left fin 3-9 and institute
It states and surrounds the second cavity 3-B between the fin 3-10 of bottom right；The right side the upper cover plate 3-1, the right side the lower plate 3-2, institute
State the right side front side board 3-5, the right side the back side panel 3-6, the upper right fin 3-8, the bottom right fin 3-10 and described
Third cavity 3-C is surrounded between right side plate 3-4；Spoiler is provided in the first cavity 3-A and the third cavity 3-C；
The outlet end of second filter 11, the first cavity 3-A, the second cavity 3-B, the third cavity 3-C and institute
State the successively fluid communication of liquid collecting filling 5；Spoiler is provided in the first cavity 3-A and the third cavity 3-C；Described first
Pass through the left fixed gap 3-16 fluid communication of the microchannel structure between cavity 3-A and the second cavity 3-B；Described second
Pass through the right fixed gap 3-17 fluid communication of the microchannel structure between cavity 3-B and the third cavity 3-C.
The circular cross section inlet port of the microchannel box group 3, circular cross section are provided in the plate face of the left plate 3-3
Import is threaded hole, and threaded hole nominal diameter is M8, is provided with the microchannel box group 3 in the plate face of the right side plate 3-4
Circular cross section outlet, circular cross section outlet are threaded hole, and threaded hole nominal diameter is M8, and second filter 11 goes out
Mouthful end passes through circular cross section inlet port on the left plate 3-3 and the first cavity 3-A fluid communication, the right side plate 3-
Circular cross section outlet on 4 fills 5 fluid communications with the liquid collecting；The first cavity 3-A described in the front side board 3-5 face
Plate face on offer threaded hole, and the import hydraulic pressure sensor 13 is installed in threaded hole screw-internal thread fit, threaded hole is public
Diameter is referred to as M12, and the plate face of third cavity 3-C described in the front side board 3-5 face offers threaded hole, and in threaded hole
It is threadedly engaged the installation outlet hydraulic pressure sensor 15, threaded hole nominal diameter is M12；Described in the front side board 3-5 face
The plate face of two cavity 3-B offers installation gap 3-18；The plate face of the first cavity 3-A described in the back side panel 3-6 face is opened
The inlet temperature sensor 12 is installed equipped with threaded hole, and in threaded hole screw-internal thread fit, threaded hole nominal diameter is
M12 offers threaded hole in the plate face of third cavity 3-C described in the back side panel 3-6 face, and is equipped in threaded hole
The outlet temperature sensor 14, threaded hole nominal diameter are M12；The second cavity 3-B described in the upper cover plate 3-1 face
Plate face on offer 4 threaded holes, threaded hole nominal diameter is M12；The second cavity described in the lower plate 3-2 face
4 threaded holes are offered in the plate face of 3-B, threaded hole nominal diameter is M12.
As shown in Fig. 9 to Figure 13, a length of 136mm of the upper cover plate 3-1, width 40mm；At the top of the first cavity 3-A
The upper cover plate 3-1 board thickness, the upper cover plate 3-1 board thickness at the top of the third cavity 3-C, first chamber
The lower plate 3-2 board thickness of the bottom body 3-A, the lower plate 3-2 board thickness of the bottom third cavity 3-C,
The front side board 3-5 board thickness, the back side panel 3-6 board thickness, the left plate 3-3 board thickness and the right side plate
3-4 board thickness is 8mm, the upper cover plate 3-1 board thickness and second chamber at the top of the second cavity 3-B
The lower plate 3-2 board thickness of the bottom body 3-B is 6mm；The rib of the upper left fin 3-7 and the upper right fin 3-8
Piece is 40mm, the left side with the left side distance d1 of upper cover plate 3-1 with a thickness of 8mm, the left side of the upper left fin 3-7
The right side of upper fin 3-7 is 40mm, the right side of the upper right fin 3-8 with the left side distance d2 of the upper right fin 3-8
Side is 40mm with the right side distance d3 of the upper cover plate 3-1；The inverted concave structure 3-19 and the convex-shaped structure
The width of 3-20 be 20mm, the inverted concave structure 3-19 depth be 6mm；A length of 120mm of the lower plate 3-2, it is wide
For 40mm, the lower-left fin 3-9 and the bottom right fin 3-10 fin with a thickness of 8mm, the left side lower-left fin 3-9
Left side distance d4 with the lower plate 3-2 is 32mm, the right side of the lower-left fin 3-9 and the bottom right fin 3-
The distance d5 of 10 left side be 40mm, the right side of the right side and lower plate 3-2 of the bottom right fin 3-10 away from
It is 32mm from d6；The height of the left plate 3-3 and right side plate 3-4 is 30mm, the left plate 3-3 and right side plate 3-4
Width is 40mm, and the center of circle of the circular cross section inlet port is at a distance from the left plate 3-3 bottom surface and rounded cross section
The center of circle of face outlet and the right side plate 3-4 bottom surface distance d7 are 19mm, the center of circle position of the circular cross section inlet port
It is located in the transverse direction of the right side plate 3-4 in the center of circle of the transverse center of the left plate 3-3, the circular cross section outlet
The heart；A length of 136mm of the front side board 3-5 and the back side panel 3-6, width 38mm；The import hydraulic pressure sensor 13 is installed
It is 19mm with the threaded hole center of circle of the outlet hydraulic pressure sensor 15 and the lower end surface front side board 3-5 distance d8, installation
The lower end surface in the threaded hole center of circle of the inlet temperature sensor 12 and the outlet temperature sensor 14 and the back side panel 3-6
Distance d9 be 19mm, the threaded hole center of circle of the import hydraulic pressure sensor 13 and the left side of the front side board 3-5 are installed
Distance d10 be 23mm, the threaded hole center of circle of the outlet hydraulic pressure sensor 15 and the right side of the front side board 3-5 are installed
Distance d11 is 23mm, install the threaded hole center of circle of the inlet temperature sensor 12 and the left side of the back side panel 3-6 away from
It is 23mm from d12, the threaded hole center of circle of the outlet temperature sensor 14 is installed at a distance from the right side of the back side panel 3-6
D13 is 23mm.
As shown in Figure 7 and Figure 8, tight fit is equipped with Thermal Performance of Micro Channels module 3-11 in the second cavity 3-B, described
The fluid inlet end of Thermal Performance of Micro Channels module be located at the left fixed gap 3-16 of the microchannel structure in, the Thermal Performance of Micro Channels
The fluid inlet end of module is located in the right fixed gap 3-17 of the microchannel structure；The Thermal Performance of Micro Channels module 3-11 includes
Permanent wall temperature Thermal Performance of Micro Channels module and constant heat flow Thermal Performance of Micro Channels module.
The perseverance wall temperature Thermal Performance of Micro Channels module includes microchannel structure 3-12 and condensation head 3-13, the condensation head
3-13 is located on the upper surface of the microchannel structure 3-12, and the left end tight fit of the microchannel structure 3-12 is mounted on institute
It states in the left fixed gap 3-16 of microchannel structure, the right end tight fit of the microchannel structure 3-12 is mounted on the microchannel
In the right fixed gap 3-17 of structure.
The constant heat flow Thermal Performance of Micro Channels module includes microchannel structure 3-12, Electric radiant Heating Film 3-14 and plastic heat shield 3-
15, the Electric radiant Heating Film 3-14 are located at the upper surface microchannel structure 3-12, and the plastic heat shield 3-15 is located at the Electric radiant Heating Film 3-
14 upper surface；The left end tight fit of the microchannel structure 3-12 is mounted on the left fixed gap 3-16 of the microchannel structure
Interior, the right end tight fit of the microchannel structure 3-12 is mounted in the right fixed gap 3-17 of the microchannel structure；The electricity
The current output terminal and current input terminal of hotting mask 3-14 is connected with the input terminal of DC power supply 4 and output end respectively.
The lower plate 3-2 as shown in Figure 2 to Figure 3 is located at the left plate 3-3, the right side plate 3-4, the front side board
Between 3-5 and the back side panel 3-6, and the lower surface of the lower plate 3-2, the lower end surface the left plate 3-3, the right side
The lower end surface plate 3-4, the lower end surface the front side board 3-5 are concordant with the lower end surface the back side panel 3-6, the lower plate 3-2's
The inside plate face of four sides and the left plate 3-3, the right side plate 3-4, the front side board 3-5 and the back side panel 3-6
Fluid-tight bonding, the upper cover plate 3-1 is clamped between the front side board 3-5 and the inside plate face of the back side panel 3-6, and institute
The left end for stating upper cover plate 3-1 is pressed on the upper surface of the left plate 3-3, and the right end of the upper cover plate 3-1 is pressed on described
On the upper surface of right side plate 3-4；The upper left fin 3-7, the upper right fin 3-8, the lower-left fin 3-9 and the bottom right
The width of fin 3-10 is 40mm, the upper left fin 3-7, the upper right fin 3-8, the lower-left fin 3-9 and described
Bottom right fin 3-10 is clamped between the front side board 3-5 and the inside plate face of the back side panel 3-6.
Working principle:
Embodiment 1
The nano-fluid for preparing various concentration, is placed in fluid reservoir 1, opens coil heater 2 to the nanometer of fluid reservoir 1
Fluid is heated, and after being heated to certain temperature, opens water pump 8, in fluid reservoir 1 nano-fluid by first filter 9 into
Row filters for the first time, filtered nano-fluid, and the flow velocity of nano-fluid is adjusted by regulating valve 10, subsequently into the second filtering
Device 11, the nano-fluid after secondary filter, into microchannel box group 3, from the import of 3 left plate 3-3 of microchannel box group into
Enter the first cavity 3-A, the import hydraulic pressure sensor 13 being mounted on the front side board 3-5 of the first cavity 3-A detects the water of input end
Pressure, the inlet temperature sensor 12 being mounted on the back side panel 3-6 of the first cavity 3-A detect the temperature of input end；Flow into first
The nano-fluid of cavity 3-A enters Thermal Performance of Micro Channels module 3-11 by the left fixed gap 3-16 of microchannel structure, is changed
Heat, at this point, being arranged on the microscope 19 at 3 rear of infrared thermal imager 18 and microchannel box group in 3 front of microchannel box group
Heat exchange situation in 17 start recording Thermal Performance of Micro Channels module 3-11 of video camera；Nano-fluid after heat exchange is changed from microchannel
The outlet of thermal modules 3-11 is flowed out, and is entered in third cavity 3-C by the right fixed gap 3-17 of microchannel structure, is mounted on the
Outlet hydraulic pressure sensor 15 on the front side board 3-5 of three cavity 3-C detects the hydraulic pressure of outlet end, is mounted on third cavity 3-C's
Outlet temperature sensor 14 on back side panel 3-6 detects the temperature of outlet end；Then in third cavity 3-C nano-fluid from the right side
The outlet of side plate 3-4 is flowed out, and is filled 5 into liquid collecting, is completed the mass transport process of nano-fluid.
At the same time, data collecting instrument 6 collects the flow q of the nano-fluid of flowmeter 16m, inlet temperature sensor 12 survey
Temperature t of the nano-fluid obtained in microchannel box group input endin, the nano-fluid that measures of import hydraulic pressure sensor 13 is in microchannel
The temperature P of box group input endin, outlet temperature sensor 14 microchannel box group input end temperature tout, outlet hydraulic pressure sensing
Temperature P of the device 15 in microchannel box group input endout, optical data collection instrument collection 3 front infrared thermal imager of microchannel box group
Video camera 17 on 2 rear microscope 19 of 18 imaging contexts and microchannel box group records the flowing in Thermal Performance of Micro Channels module 3-11
Image.The number of the time signal output end of video camera 17, the time signal output end of infrared thermal imager 18 and data collecting instrument 6
Connect respectively with the input terminal of synchronizer 20 according to output end, the image signal output end of the video camera 17, it is described it is infrared heat at
As the image signal output end of instrument 18 and the data output end input terminal with the data analyzer 7 respectively of the synchronizer 20
Connection.The heat exchange of the time output signal of video camera 17, the time output signal of infrared thermal imager 18 and data collecting instrument 6
Data-signal enters synchronizer 20 and synchronizes, and reduces error, then the picture signal, infrared thermal imager 18 of video camera 17
The time output signal of the time output signal of the video camera 17 being synchronized in picture signal and synchronizer, infrared thermal imager 18
It with the heat exchange data-signal of data collecting instrument 6, is transmitted to data analyzer 7 and is analyzed, and then calculate the heat exchange effect of microchannel
Rate and heat exchange amount.
When Thermal Performance of Micro Channels module 3-11 is permanent wall temperature Thermal Performance of Micro Channels module, the upper surface of microchannel structure 3-12
Condensation head 3-13 inlet end and an outlet end need open and be connected to by ebuillition of heated generate excess steam, pass through control
The wall temperature of the corresponding fixed condensation point control microchannel structure 3-12 of the ingredient coagulated components of steam is constant, obtains tw。
When Thermal Performance of Micro Channels module 3-11 is constant heat flow Thermal Performance of Micro Channels module, the upper surface microchannel structure 3-12
Electric radiant Heating Film 3-14 is heated by external DC power supply 4, and the voltage U and ammeter shown by voltmeter on DC power supply 4 is aobvious
The electric current I shown, the electrical heating power of available Electric radiant Heating Film 3-14, DC power supply 4 are connected with slide rheostat, are flowed by changing
The electric current of Electric radiant Heating Film 3-14 is crossed, the electrical heating power of Electric radiant Heating Film 3-14 is changed.
Spoiler is installed in the first cavity 3-A and the second cavity 3-C, makes to enter Thermal Performance of Micro Channels module 3-11 entrance
Temperature uniformly, the ingredient of nano-fluid it is uniform.
The material of microchannel box group 3 is poor thermal conductivity, such as transparent acrylic or glass that translucency is strong.It is considered that
Microchannel box group 3 is insulation, and 3 interior temperature distribution of microchannel box group that infrared thermal imager 18 is shot is exactly: microchannel is changed
The temperature on the surface thermal modules 3-11, it is unrelated with the temperature of microchannel box group 3 itself.
The resistance very little of Electric radiant Heating Film 3-14, therefore when external when in use DC power supply 4 heats, circuit should use electric current
Off-balancesheet connection, and ignore the electric current for flowing through voltmeter.
The cavity for condensing head 3-13 is copper, and material heating conduction is very strong and structure size is small, therefore the temperature of edge
Degree is also similar to the wall temperature temperature t of microchannel structure 3-12w。
Embodiment 2
In order to study varigrained nano-fluid in the Thermal Performance of Micro Channels module 3-11 of different structure and different pore size
Heat exchange efficiency and heat exchange amount, it is thus only necessary to microchannel nano-fluid strengthen heat test detection device in microchannel box group 3 into
Row adjustment.
1. changing Thermal Performance of Micro Channels module 3-11
It is required for the difference in test, needs to change the size of Thermal Performance of Micro Channels module 3-11 microchannel structure 3-12
And the Thermal Performance of Micro Channels module 3-11 of structure and different heat transfer mode.It, can be individually to micro- in the device of the utility model
Channel for heat exchange module 3-11 is assembled, and is then opened up by the plate face of the second cavity 3-B described in the front side board 3-5 face
Thermal Performance of Micro Channels module 3-11 is installed in microchannel box group 3 in second cavity 3-B by groove, during the installation process, Ke Yitong
4 holes crossed on upper cover plate 3-1 and lower plate 3-2 are adjusted Thermal Performance of Micro Channels module 3-11, so that Thermal Performance of Micro Channels mould
The left fixed gap 3-16 of the input end and microchannel structure of block 3-11 is fitted close, and prevents the exudation of nano-fluid, microchannel is changed
The outlet end of thermal modules 3-11 and the right fixed gap 3-17 of microchannel structure are fitted close, and prevent the exudation of nano-fluid.Very
Facilitate operation.
2. changing gap between fin
Upper cover plate 3-1 can be removed from left plate 3-3, right side plate 3-4, front side board 3-5 and back side panel 3-6, pass through tune
The lower-left fin 3-9 and bottom right fin on upper left fin 3-7 and upper right fin 3-8 and lower plate 3-2 on whole upper cover plate 3-1
The left fixed gap 3-16 of the microchannel structure of the male-female engagement of the 3-10 and right fixed gap 3-17 of microchannel structure is micro- logical to adapt to
The size of road heat exchange module 3-11.Upper cover plate 3-1 and lower plate 3-2, left plate 3-3, right side plate 3-4, front side board 3-5 and rear side
The split-type design of plate 3-6 can be convenient the replacement during testing to upper cover plate 3-1.
Embodiment 3
Microchannel nano-fluid is used for using the microchannel nano-fluid enhanced heat exchange experiment test device of the utility model
In enhanced heat exchange test, specific test result is as follows.
Thermal balance type:
Q=hA Δ tm=qmcp(tin-tout)
Wherein, Q is the heat exchange amount of liquid, unit W, h are convection transfer rate, unit W/m2K, A be heat exchange area,
Unit m2, Δ tmFor the arithmetic mean temperature difference, unit K, qmFor the liquid mass flow in heat convection, units/kg/s, cpFor liquid
Specific heat at constant pressure, unit J/ (kgK), tinInlet temperature, unit K for liquid-inlet microchannel box group, toutFor liquid outflow
Outlet temperature, the unit K of microchannel box group.
According to thermal balance type, the inlet temperature that nano-fluid enters microchannel box group is measured by inlet temperature sensor 12
tin, outlet temperature sensor 14 measure nano-fluid disengaging microchannel box group outlet temperature tout, the measurement of flowmeter 16 is by micro-
The mass flow q of channel box groupm；Then different in flow rate, insoluble wall temperature, different hot-fluids, different nano-fluids, difference is calculated
The heat exchange amount Q and coefficient of heat transfer h of nano-fluid concentration, different microchannel structure, to obtain relevant influence factor.This system
In, due to the concentration very little of nano-fluid, nano-fluid specific heat at constant pressure cpIt is approximately the specific heat at constant pressure that atmospheric pressure is lauched.
By measurement import hydraulic pressure sensor 13 and the measurement nano-fluid of hydraulic pressure sensor 15 is exported in the pressure change of microchannel box group
Situation, can exchange heat and the coefficient of heat transfer is modified.
1. the influence of wall temperature exchange heat and the coefficient of heat transfer
Shown in table 1 and Figure 14, as wall temperature increases, the heat exchange amount Q of wall surface and water, nano-fluid is respectively increased to 0.9kJ
And 1.1kJ；In the case where water and nano-fluid are respectively adopted under identical structure, coefficient of heat transfer h is respectively in 40000W/ (m2·K)
With 50000W/ (m2K near), not with difference variation；Under identical wall temperature setting, the nano-fluid coefficient of heat transfer is significantly greater than water
The coefficient of heat transfer.Nano-fluid is SiO2, SiO2Volume ratio be 0.03, i.e. VSiO2/(VSiO2+VH2O)=0.03.
The coefficient of heat transfer does not change the reason is that system structure does not change, and heat-exchange working medium does not change；Nanometer stream
When body and water compare, in contrast heat-exchange working medium is different, and the solid particle coefficient of heat transfer in nano-fluid is significantly greater than fluid, by force
The heat exchange of mixed flow is changed.
Table 1
2. the influence of hot-fluid exchange heat and the coefficient of heat transfer
As shown in table 2 and Figure 15, as wall temperature increases, wall surface and water, nano-fluid heat exchange amount Q be respectively increased to
2.189kJ and 2.199kJ；In the case where water and nano-fluid are respectively adopted under identical structure, the coefficient of heat transfer is respectively in 39600W/
(m2) and 40000W/ (m K2K near), not with difference variation；Different from Fig. 1, nano-fluid and water changes under identical hot-fluid
Heat, coefficient of heat transfer difference are smaller.Nano-fluid is SiO2, SiO2Volume ratio be 0.03, i.e. VSiO2/(VSiO2+VH2O)=
0.03。
The coefficient of heat transfer does not change the reason is that system structure does not change, and heat-exchange working medium does not change；Nanometer stream
When body and water compare, in contrast heat-exchange working medium is different, and the solid particle coefficient of heat transfer in nano-fluid is significantly greater than fluid, by force
The heat exchange of mixed flow is changed, but different from permanent wall temperature, the loading method of energy makes metal wall surface temperature be gradual change, reduces
The influence of fluid heat transfer ability, therefore the coefficient of heat transfer and heat exchange amount difference are smaller.
Table 2
3. the influence of inlet flow rate exchange heat and the coefficient of heat transfer
As shown in table 3 and Figure 16, as inlet flow rate u is increased, the heat exchange amount Q of wall surface and water, nano-fluid is respectively increased
To 0.633kJ and 0.777kJ；The coefficient of heat transfer is increased with flow velocity, is significantly improved；Under identical flow velocity, nano-fluid is obvious
Greater than the coefficient of heat transfer and heat exchange amount of water.Nano-fluid is SiO2, SiO2Volume ratio be 0.03, i.e. VSiO2/(VSiO2+VH2O)
=0.03.
As flow velocity increases, the heat load of fluid is improved, and is improved with the relative velocity of wall surface, although inlet and outlet temperature difference drop
It is low, but the raising of flow increases the exchange capability of heat of system, so that the coefficient of heat transfer and heat exchange amount have obvious variation.
Table 3
4. the influence of reynolds number Re exchange heat and the coefficient of heat transfer
As shown in chart 4 and Figure 17, as Re is increased, heat exchange amount is increased；Meanwhile water is respectively adopted under identical structure
And under the different conditions of nano-fluid, the coefficient of heat transfer increases with Re and is increased；Under identical Re, the coefficient of heat transfer of nano-fluid with change
Heat is significantly greater than water, and rule is almost the same with the influence of Figure 16 variable-flow.Nano-fluid is SiO2, SiO2Volume ratio be
0.03, i.e. VSiO2/(VSiO2+VH2O)=0.03.
Reynolds number is influenced by flow velocity, equivalent diameter and kinematic viscosity, and wherein equivalent diameter is determined by system structure, is not occurred
Change；Since fluid temperature variations are smaller, kinematic viscosity influence factor is also unobvious, therefore to the most apparent influence factor of Reynolds number
The flow velocity in channel, thus with Reynolds number variation figure line with it is quite similar with change in flow.
Table 4
5. the influence of variety classes nano particle exchange heat and the coefficient of heat transfer
As shown in table 5 and Figure 18, as nano-fluid changes, water, SiO2Nano-fluid and Al2O3The heat exchange of nano-fluid
Amount is respectively 0.633kJ, 0.777kJ and 0.971kJ；Meanwhile water, SiO being respectively adopted under identical structure2And Al2O3In the case of,
The coefficient of heat transfer has significant change；Under identical operating condition, using SiO2The coefficient of heat transfer and heat exchange amount are significantly less than using Al2O3The case where.
SiO2The volume ratio of nano-fluid is 0.03, i.e. VSiO2/(VSiO2+VH2O)=0.03, Al2O3The volume ratio of nano-fluid is 0.03,
That is VAl2O3/(VAl2O3+VH2O)=0.03.
Relative to water, the solid particle coefficient of heat transfer in nano-fluid is significantly greater than fluid, enhances the heat exchange of mixed flow；
The thermal conductivity of different nano-particle materials is different, Al2O3Thermal coefficient is significantly greater than SiO2, cause the coefficient of heat transfer equal with heat exchange amount
There is larger gap.
Table 5
6. the influence of various concentration nano particle exchange heat and the coefficient of heat transfer
As shown in table 6 and Figure 19, improved with nano-fluid volume ratio, heat exchange amount and the coefficient of heat transfer be respectively increased to
0.3157kJ and 22711W/ (m2·K).It is Al in table 62O3The volume ratio of nano-fluid, i.e. VAl2O3/ (VAl2O3+VH2O)。
The increase of volume ratio improves the quantity of nano particle, total exchange capability of heat of mixed flow is enhanced, to improve
The coefficient of heat transfer and heat exchange amount.
Table 6
7. the influence of microchannel number exchange heat and the coefficient of heat transfer
As shown in table 7 and Figure 20, in the case that channel velocity is constant, with the increase of port number, water and SiO2Nanometer stream
Body heat exchange amount is respectively increased to 0.674kJ and 0.642kJ；In addition to individual fluctuations, increasing with port number, total heat exchange area increases,
The coefficient of heat transfer of unit heat exchange area reduces, water and SiO2Nano-fluid changes coefficient and is reduced to 48988W/ (m respectively2K) and
46572W/(m2·K)。SiO2The volume ratio of nano-fluid is 0.03, i.e. VSiO2/(VSiO2+VH2O)=0.03.
Port number increase so that fluid flow it is more uniform with it is gentle, reduce the exchange capability of heat with wall surface, therefore change
Hot coefficient reduces, and the increase of flow is so that total heat exchange amount improves.
Table 7
8. the influence of microchannel caliber heat exchanging amount and the coefficient of heat transfer
As shown in table 8 and Figure 21, in the case that channel velocity is constant, with the increase of channel caliber, the coefficient of heat transfer with change
Heat increases, and slope gradually decreases, after caliber increases to 0.8mm from 0.3mm, water and SiO2The heat exchange amount of nano-fluid is distinguished
It improves to 0.741KJ and 0.748KJ, the coefficient of heat transfer is respectively increased to 46461W/ (m2) and 46879W/ (m K2·K)。SiO2
The volume ratio of nano-fluid is 0.03, i.e. VSiO2/ (VSiO2+VH2O)=0.03.
When flow velocity is constant, the caliber increase of microchannel causes flow to increase, and the heat load of fluid increases, the coefficient of heat transfer with change
Heat increases accordingly；Since nano-fluid exchange capability of heat is better than water, the coefficient of heat transfer and heat exchange amount are above the latter.
Table 8
Global analysis, the result obtained under the conditions of different wall temperatures is more significant, microchannel structure and flow velocity and fluid type
Determine the coefficient of heat transfer, when importing and exporting the temperature difference reduces, Composite Walls may be because the increase of flow instead and improve.
Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And it is extended from this it is obvious variation or
It changes among the protection scope created still in the utility model.
Claims (10)
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| CN108802090A (en) * | 2018-06-22 | 2018-11-13 | 内蒙古工业大学 | A kind of microchannel nano-fluid enhanced heat exchange experiment test device |
| CN111504854A (en) * | 2020-04-13 | 2020-08-07 | 中国矿业大学 | Temperature difference type measuring device and method for viscosity of Newton fluid |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108802090A (en) * | 2018-06-22 | 2018-11-13 | 内蒙古工业大学 | A kind of microchannel nano-fluid enhanced heat exchange experiment test device |
| CN108802090B (en) * | 2018-06-22 | 2023-07-28 | 内蒙古工业大学 | A microchannel nanofluid enhanced heat transfer test device |
| CN111504854A (en) * | 2020-04-13 | 2020-08-07 | 中国矿业大学 | Temperature difference type measuring device and method for viscosity of Newton fluid |
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