CN117619471A - Condensation experimental device based on array jet impact - Google Patents
Condensation experimental device based on array jet impact Download PDFInfo
- Publication number
- CN117619471A CN117619471A CN202310452881.XA CN202310452881A CN117619471A CN 117619471 A CN117619471 A CN 117619471A CN 202310452881 A CN202310452881 A CN 202310452881A CN 117619471 A CN117619471 A CN 117619471A
- Authority
- CN
- China
- Prior art keywords
- jet
- air
- air supply
- condensation
- channel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000005494 condensation Effects 0.000 title claims abstract description 61
- 238000009833 condensation Methods 0.000 title claims abstract description 61
- 239000003507 refrigerant Substances 0.000 claims abstract description 43
- 238000001816 cooling Methods 0.000 claims abstract description 27
- 238000012360 testing method Methods 0.000 claims abstract description 14
- 239000000110 cooling liquid Substances 0.000 claims description 16
- 230000000087 stabilizing effect Effects 0.000 claims description 12
- 230000001105 regulatory effect Effects 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 4
- 238000002474 experimental method Methods 0.000 abstract description 15
- 230000004044 response Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 9
- 239000002184 metal Substances 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 7
- 230000001965 increasing effect Effects 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 239000002826 coolant Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000005485 electric heating Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 239000000306 component Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L7/00—Heating or cooling apparatus; Heat insulating devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0003—Condensation of vapours; Recovering volatile solvents by condensation by using heat-exchange surfaces for indirect contact between gases or vapours and the cooling medium
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Clinical Laboratory Science (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The invention discloses a condensation experimental device based on array jet impact, which is mainly used for experimental study of local condensation heat exchange coefficients in a heat exchange tube and is characterized by comprising a test section, an air supply system and a refrigerant circulation system. The test section consists of a jet device, a tested channel and a sensor, the air supply system supplies required cooling air for the jet device, and the refrigerant circulation system supplies refrigerant in a required state for the tested channel. The jet plate in the jet device is utilized to generate uniform jet, cooling air is impacted to the wall surface of the channel to be tested, and heat exchange is carried out between the cooling air and the wall surface, so that the condensation of the vaporous refrigerant in the channel to be tested is realized. The air supply system is used for controlling the state of jet air, and the condensation experimental device can simulate different condensation working conditions. The invention meets the experimental conditions of the local condensation heat exchange coefficient, and meanwhile, the condensation experimental device has wide adjustment range, high response speed and simple control, and can effectively improve the stability of the condensation experiment and the reliability of data.
Description
Technical Field
The invention relates to a condensation experimental device, in particular to an array impact jet device and a working mode thereof, which can obtain a local condensation heat exchange coefficient in a detected channel and belong to the technical field of condensation experiments.
Background
In-line flow condensation is a common two-phase heat transfer process that often occurs in a variety of industrial applications, such as air conditioning systems and spacecraft thermal control systems. With the increasing thermal load of cooling systems, efficient heat removal is critical to maintaining reliable system performance. Wherein the condenser is required to have higher heat transfer efficiency under weight and size constraints as a core component in two-phase heat exchange. In order to further improve the performance of the condenser, methods for enhancing condensation heat exchange in the tube have been widely studied. Therefore, a condensation experimental device is needed, experimental researches are carried out on different reinforced pipes so as to know condensation heat exchange characteristics of the reinforced pipes, and in addition, the condensation experimental device can also verify design and provide guidance for design selection of heat exchange pipes in a condenser. The current most condensation experiments adopt a sleeve cooling device, which is generally used for measuring average condensation heat exchange coefficient in a pipe, and the research on the condensation heat exchange mechanism and the establishment of a condensation model need to obtain accurate local values of the condensation heat exchange coefficient in the pipe, but the traditional sleeve condensation experimental device in the present stage cannot meet the accurate measurement requirement of the local condensation heat exchange coefficient.
Aiming at the defects of the condensation experimental technology, the invention provides a condensation experimental device based on array jet impact. As a high-efficiency cooling method, the air impact jet cooling has a strong heat transfer effect and can meet the cooling requirement in a condensation experiment. When experiments are carried out on the detected channels with different sizes, the single-hole impact jet cannot meet the uniform coverage of the target surface, so that the large-area cooling requirement can be met by adopting the multi-hole array jet impact. The impact jet flow of the porous array can uniformly cool the heat exchange surface, but the jet flow cooling effect needs to be researched and designed on the geometric parameters of the porous array. In addition, for the condensation experiment, the state of the cooling medium has an important influence on the stability of the condensation process, and each parameter of the cooling medium needs to be stable and respond quickly during adjustment.
Disclosure of Invention
In view of the limitations of condensation experimental technology, the invention provides a condensation experimental device based on array jet impact, and provides a new method for experimental study of local condensation heat exchange coefficients in a detected channel.
In order to achieve the aim, the invention provides a condensation experimental device based on array jet impact and a corresponding working method. The test section consists of a jet device, a tested channel and a sensor; in the jet device, the jet device is provided with a closed pressure stabilizing cavity, an air inlet flute type pipe is arranged above the pressure stabilizing cavity, the air inlet flute type pipe is connected with an air supply system, and air supply holes are uniformly formed in the air inlet flute type pipe positioned in the pressure stabilizing cavity; jet flow plates are arranged on the lower wall surface of the pressure stabilizing cavity, and jet flow holes are uniformly arranged on the jet flow plates; the jet hole is vertical to the wall surface of the channel to be measured and keeps a certain distance; limiting baffles are arranged on two sides of the jet flow plate, and a fixed jet flow area is formed between the jet flow plate and a channel to be tested by the limiting baffles; wall temperature sensors are uniformly arranged on the wall of the detected channel, and an inlet refrigerant temperature sensor, an inlet refrigerant pressure sensor, an outlet refrigerant temperature sensor and an outlet refrigerant pressure sensor are respectively arranged at the inlet and the outlet in the detected channel;
the cooling air provided by the low-temperature air source in the air supply system flows through the air heater and is divided into two paths, one path of cooling air enters the bypass flow regulating valve and is communicated with the atmosphere, the other path of cooling air enters the jet air inlet flute pipe in the jet device, the components are connected through an air supply pipeline, and the jet air supply mass flowmeter and the jet air supply temperature sensor are arranged on the air supply pipeline before entering the jet device and used for feeding back the jet air state;
the refrigerant circulation system is formed by sequentially connecting a liquid storage tank, a gear pump, a flowmeter, an evaporator, a detected channel and a condenser through pipelines, a circulation loop is formed, detected working medium is filled in the loop, a channel refrigerant temperature sensor and a channel refrigerant pressure sensor are arranged at the inlet of the evaporator, and the cooling unit provides cooling liquid for the condenser.
Further, the jet holes are uniformly arranged on the wall surface of the jet plate, the diameter range of the jet holes is 1-2 mm, the ratio range of the distance between adjacent jet holes and the diameter of the jet holes is 4-6, and the ratio range of the distance between the jet plate and the target surface and the diameter of the jet holes is 6-8, so that condensation jet flows of channels with different sizes can be effectively realized by adjusting jet hole parameters.
Further, the limiting baffle limits the detected channel to be right below the jet hole, a jet flow area with fixed jet flow height is formed between the jet flow plate and the detected channel, and the value of the jet flow height is 3-5 times of the diameter of the jet hole.
Further, the upper wall surface of the jet air inlet flute pipe is provided with uniform air supply holes, the diameter of each air supply hole is 4-6 mm, the ratio range of the axial distance of each air supply hole to the diameter of each air supply hole is 4-6, the radial angle range of each air supply hole is 45-60 degrees, uniform air inlet can be realized through adjustment of air supply hole parameters, and the flow field stability in the pressure stabilizing cavity is accelerated.
Further, the air heater is used for adjusting jet flow air inlet temperature, the bypass flow regulating valve is used for adjusting jet flow air supply flow, and the design realizes rapid adjustment of different jet flow working conditions and facilitates switching of condensation experimental working conditions.
Further, the wall temperature sensors are arranged in the jet flow area of the detected channel, and the ratio range of the interval between the wall temperature sensors to the diameter of the jet flow hole is 20-30, so that the wall temperature sensors are used for feeding back the local wall temperature of the detected channel.
Further, the cooling unit can provide constant-temperature cooling liquid with adjustable temperature of-25 ℃ to 50 ℃ for the condenser, the temperature of the cooling liquid can be adjusted to control the condensation heat exchange temperature difference in the condenser, the adjustment of working pressure in a refrigerant circulation system is realized, and the temperature of the cooling liquid is fed back through a cooling liquid temperature sensor.
Compared with the prior art, the invention has the beneficial effects that:
(1) The invention provides a new method for experimental study of the local condensation heat exchange coefficient in the pipe, ensures that the surface of the measured channel has uniform jet impact heat exchange coefficient based on the heat exchange characteristic of the array jet impact, calculates the local condensation heat flow density according to the temperature difference between the collected jet air and the wall surface of the measured channel, solves the problem that the local heat flow density cannot be accurately measured, and further calculates the local condensation heat exchange coefficient in the measured channel based on the temperature difference.
(2) The condensation experimental device has the advantages of simple control logic, high system response speed, high working stability, convenient assembly of each component, easy replacement, and suitability for experimental study of condensation working condition range and different-size detected channels.
Drawings
FIG. 1 is a schematic diagram of a condensation experimental device based on array impact jet flow;
FIG. 2 is a connection assembly diagram of the test section of the present invention;
FIG. 3 is a cross-sectional view of a fluidic device of the present invention;
FIG. 4 is a bottom view of the fluidic device of the present invention;
FIG. 5 is a perspective view of the wall temperature sensor of the present invention;
FIG. 6 is a schematic view of a jet plenum flute tube in a test section of the present invention;
FIG. 7 is a schematic diagram of an air supply system of the present invention;
FIG. 8 is a schematic diagram of the calibration experiment system of the present invention;
FIG. 9 is a perspective view of a target plate assembly of the present invention;
figure 1-test section:
11-jet device, 12-tested channel, 13-jet air inlet flute pipe, 14-air feed hole, 15-pressure stabilizing cavity, 16-jet plate, 17-jet hole, 18-limit baffle, 19-wall temperature sensor, 110-inlet refrigerant temperature sensor, 111-inlet refrigerant pressure sensor, 112-outlet refrigerant temperature sensor and 113-outlet refrigerant pressure sensor;
2-air supply system: 21-a low-temperature air source, 22-an air heater, 23-a bypass flow regulating valve, 24-an air supply pipeline, 25-a jet air supply mass flowmeter and 26-a jet air supply temperature sensor;
3-refrigerant cycle system: 31-a liquid storage tank, 32-a gear pump, 33-a flowmeter, 34-an evaporator, 35-a condenser, 36-a cooling unit and 37-a cooling liquid temperature sensor;
4-fluidic device calibration system: 41-metal target plate, 42-metal target plate wall surface temperature sensor, 43-heating film, 44-adjustable direct current power supply.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The invention provides a condensation experimental device based on array jet impact, which comprises a test section 1, an air supply system 2 and a refrigerant circulation system 3, wherein the air supply system 2 provides required jet air for the test section 1, and the refrigerant circulation system 3 provides required refrigerant for the test section 1 as shown in figure 1. The cooling air flows through the jet device 11 to impact the wall surface of the detected channel 12, and the cooling air exchanges heat with the wall surface to take away the heat of the refrigerant, so that the condensation of the vaporous refrigerant in the detected channel 12 is realized.
The assembly relation of the test section 1 is shown in fig. 2, the fluidic device 11 is arranged above the tested channel 12, and an inlet refrigerant temperature sensor 110, an inlet refrigerant pressure sensor 111, an outlet refrigerant temperature sensor 112 and an outlet refrigerant pressure sensor 113 are respectively arranged at the inlet and outlet of the tested channel 12; in the jet device 11, as shown in fig. 3, jet air provided by the air supply system 2 flows through the jet air inlet flute pipe 13, enters the pressure stabilizing cavity 15 through the air supply hole 14 on the upper wall surface of the jet air inlet flute pipe 13, and then the jet air is impacted to the wall surface of the channel 12 to be tested through the jet hole 17 on the jet plate 16; limiting baffles 18 arranged on two sides of the jet plate are shown in fig. 4, the limiting baffles are used for limiting the detected channel 12 to be right below the jet hole 17, and limiting a jet area with fixed jet height between the jet plate and the detected channel, the jet height can be changed to meet the requirements of different jet areas by adjusting the limiting baffles 17, and the jet height is 3-5 times of the diameter of the jet hole; wall temperature sensors 19 are uniformly arranged on the wall surface of the detected channel 12, as shown in fig. 5, the arrangement area of the wall temperature sensors 19 is consistent with the jet flow area, and the ratio of the interval between the wall temperature sensors 19 to the diameter of the jet hole 17 ranges from 20 to 30.
In order to realize uniform array jet impact, as shown in fig. 4, jet holes 17 are uniformly arranged on the wall surface of a jet plate 16, the diameter range of the jet holes is 1-2 mm, the ratio range of the distance between adjacent jet holes to the diameter of the jet holes is 4-6, and the ratio range of the distance between the jet plate and the target surface to the diameter of the jet holes is 6-8, so that condensation jet flows of channels to be measured with different sizes can be effectively realized by adjusting jet hole parameters. As shown in fig. 3 and 6, the upper wall surface of the jet air-feeding flute pipe 13 is provided with uniform air-feeding holes 14, the diameter of each air-feeding hole is 4-6 mm, the ratio range of the axial distance of each air-feeding hole to the diameter of each air-feeding hole is 4-6, the radial angle of each air-feeding hole is 45-60 degrees, uniform air-feeding can be realized through adjusting the parameters of each air-feeding hole, the flow field in the pressure stabilizing cavity 15 is accelerated to be stable, and the uniform jet of the jet plate is ensured.
The air supply system 2 consists of a low-temperature air source 21, an air supply pipeline 22, an air heater 23, a bypass flow regulating valve 24, a jet air supply mass flowmeter 25 and a jet air supply temperature sensor 26, wherein as shown in fig. 7, the air provided by the low-temperature air source 21 is divided into two paths after flowing through the air heater 23, one path is connected with the bypass flow regulating valve 24, and the outlet of the bypass flow regulating valve 24 is communicated with the environment; the other path is connected with the test section 1, and a jet air supply mass flowmeter 25 and an air supply temperature sensor 26 are respectively used for monitoring the air supply flow and the air supply temperature of the path. The air heater 23 is in a non-heating state, the bypass flow regulating valve 24 is in a normally closed state, when the jet impact cooling intensity needs to be reduced, the opening of the bypass flow regulating valve 24 is preferentially increased, and the jet air supply flow is reduced; when the opening of the bypass flow regulating valve 24 is maximum, but the jet impact cooling intensity still needs to be reduced, the heating power of the air heater 23 is increased, and the jet air supply temperature is increased.
The refrigerant circulation system 3 provides the required refrigerant for the tested channel 12, and as shown in fig. 1, the liquid storage tank 31, the gear pump 32, the flowmeter 33, the evaporator 34, the tested channel 12 and the condenser 35 are sequentially connected through pipelines to form a circulation loop. The evaporator 34 adopts a parallel flow porous flat tube heat exchanger, an electric heating film is arranged on the wall surface of the heat exchanger, and the superheat degree of the refrigerant at the inlet of the detected channel 12 can be quickly adjusted by controlling the electric heating power. The cooling unit 36 can provide constant-temperature cooling liquid with adjustable temperature of-25 ℃ to 50 ℃ for the condenser 35, the condensation heat exchange temperature difference in the condenser 35 is controlled by adjusting the temperature of the cooling liquid, the adjustment of the working pressure in the refrigerant circulation system is realized, and the temperature of the cooling liquid is fed back through the cooling liquid temperature sensor 37.
The experimental method comprises the following steps:
step one, the size of the measured channel 12 is determined (e.g. jet impact area A air Heat exchange area A of inner wall of detected channel h ) A condensation experimental condition range (such as minimum saturation temperature T sat,min ) Calculate the required maximum condensing load Q cold.max The method comprises the steps of carrying out a first treatment on the surface of the Confirming the state range (supply flow rate m and supply temperature T) of the supply system 2 supplying jet air air ) The method comprises the steps of carrying out a first treatment on the surface of the Referring to the existing related condensation research results, the condensation heat exchange coefficient h in the detected channel is estimated according to the selected experimental working condition tp,pre (for example, for a flat microchannel, let h tp,pre ＝3000kW/m 2 K) According to formula Q cold，max ＝h tp,pre A h (T w,pre -T sat,min ) Estimated wall temperature T w,pre Then according to the formulaEstimating the minimum jet impact heat exchange coefficient value h j,pre (air supply temperature T) air Take the minimum value).
Step two, according to the estimated minimum jet impact heat exchange coefficient h j,pre And the maximum value of the air supply flow m, designing the jet height defined by the parameters of the air supply hole 14 on the upper wall surface of the jet air inlet flute type pipe 13, the jet hole 17 on the jet plate 16 and the limit baffle 18 in the jet device 11, and verifying the design through CFD simulation, wherein the requirement h is that j,CFD ≥1.2h j,pre And iteratively selecting a design scheme meeting the requirements, machining a required part, and assembling the jet device.
Step three, constructing a calibration experiment system, as shown in fig. 8, wherein the calibration experiment system comprises a jet device calibration system 4 and a gas supply system 2, and aims to verify whether the gas supply system 2 and the jet device 11 meet the condensation experiment requirement and complete the calibration of jet impact heat exchange coefficients in the full jet working condition range; in the calibration experiment, the metal target plate 41 has the same external dimension as the channel 12 to be tested, and the S-shaped electric heating film 43 is stuck on the back of the metal target plate for providing uniform heat flow q h As shown in fig. 9, the heating film region coincides with the jet region, and a metal target plate wall surface temperature sensor 42 is arranged at the gap between the heating films, and the metal target plate wall surface temperature is transmittedThe ratio of the distance between the sensors 42 to the diameter of the jet hole 17 ranges from 20 to 30;
step four, verifying 1: jet uniformity verification of the jet device is carried out by comparing the local wall surface temperature T of the metal target surface w,i The difference between the two wall temperatures is detected by the detection standard that the difference between the local wall temperatures does not exceed the measurement uncertainty of the temperature sensor;
step five, verifying 2: whether the jet device meets the requirement of condensation experimental working conditions or not is judged by comparing the actual jet impact heat exchange coefficient h j And the minimum jet impact heat exchange coefficient h estimated in the step 1 j,pre The test standard is h j ≥h j,pre (jet flow condition: air supply flow rate mMax, air supply temperature T) air Lowest). Actual jet impact heat exchange coefficient h j According to formula h j ＝q h /(T wm -T air )(T wm Is T w,i Average value of (d).
Step six, after verification, carrying out a plurality of groups of jet impact experiments in the full jet working condition range, and completing experimental calibration of the jet device to obtain an actual jet impact heat exchange coefficient h j Relationship with jet air Re and Pr: h is a j ＝aRe b Pr 1/3 The constant coefficients a and b in the formula are determined by fitting according to the calibration experimental result, and jet air Re is defined as:(m is jet air mass flow, d is jet hole equivalent diameter, A is total flow cross section of all jet holes, mu is dynamic viscosity), and jet air Pr is physical parameter and is determined by jet air temperature.
Step seven, obtaining the actual jet impact heat exchange coefficient h j After the calculation formula, as shown in fig. 1, a condensation experiment system is built to develop a condensation experiment. Q according to the formula k ＝h j (T w,k -T air )(q k To the local condensation heat flow density, h j For jet impact heat exchange coefficient, T air Is jet air temperature, T w,k Local wall temperature of the detected channel) can obtain the corresponding local position k in the current stateCondensing heat flow density according to(h tp,k Is the local condensation heat exchange coefficient T sat,k Is the local saturation temperature of the refrigerant) can obtain the condensation heat exchange coefficient corresponding to the local position k in the tube of the detected channel (14) in the current state, and the local saturation temperature T of the refrigerant sat,k There are 4 calculation methods, determined by the local saturation pressure: the method comprises the steps of import-export average assumption, linear distribution assumption, pressure drop model prediction and direct measurement of absolute pressure, and is specifically selected according to actual conditions.
Step eight, switching condensation working conditions, which can be obtained by changing jet air parameters (jet air temperature or jet air supply flow); when the condensing heat flux density is reduced (the jet air temperature is increased or the jet air supply flow is decreased), the coolant temperature supplied by the cooling unit 36 needs to be appropriately reduced, whereas the coolant temperature needs to be increased to maintain the stability of the operating pressure in the refrigerant cycle.
The foregoing is merely a preferred embodiment of the invention, and it should be noted that modifications could be made by those skilled in the art without departing from the principles of the invention, which modifications would also be considered to be within the scope of the invention.
Claims (7)
1. The experimental device for the condensation heat exchange coefficient based on array jet impact is characterized by comprising a test section (1), an air supply system (2) and a refrigerant circulation system (3); wherein the test section (1) comprises a jet device (11), a channel to be tested (12) and a sensor; the jet device (11) comprises a closed pressure stabilizing cavity (15), an air inlet flute type pipe (13) is arranged above the pressure stabilizing cavity (15), the air inlet flute type pipe (13) is communicated with the air supply system (2), and air supply holes are uniformly formed in the air inlet flute type pipe (13) positioned in the pressure stabilizing cavity (15); jet flow plates (16) are arranged on the lower wall surface of the pressure stabilizing cavity (15), and jet flow holes (17) are uniformly arranged on the jet flow plates (16); the jet hole (17) is vertical to the wall surface of the channel (12) to be measured and keeps a certain distance; limit baffles (18) are arranged on two sides of the jet plate (16), and a fixed jet area is formed between the jet plate (16) and the channel (12) to be tested by the limit baffles (16); wall temperature sensors (19) are uniformly arranged on the wall of the detected channel (12), and an inlet refrigerant temperature sensor (110), an inlet refrigerant pressure sensor (111), an outlet refrigerant temperature sensor (112) and an outlet refrigerant pressure sensor (113) are respectively arranged at the inlet and outlet of the detected channel (12);
the cooling air provided by the low-temperature air source (21) in the air supply system (2) flows through the air heater (22) and is divided into two paths, one path of cooling air enters the bypass flow regulating valve (23) and is communicated with the atmosphere, the other path of cooling air enters the jet air inlet flute type pipe (13) in the jet device (11), the components are connected through the air supply pipeline (24), and the jet air supply mass flowmeter (25) and the jet air supply temperature sensor (26) are arranged on the air supply pipeline before entering the jet device and used for feeding back the jet air state;
the refrigerant circulation system (3) comprises a liquid storage tank (31), a gear pump (32), a flowmeter (33), an evaporator (34), a detected channel (12) and a condenser (35) which are sequentially connected through pipelines to form a circulation loop, and detected working medium is filled in the loop; a channel refrigerant temperature sensor (37) and a channel refrigerant pressure sensor (38) are arranged at the inlet of the evaporator (34); the cooling unit (36) supplies cooling liquid to the condenser (35), and a cooling liquid temperature sensor (37) is arranged before entering the condenser (35).
2. The experimental device according to claim 1, wherein the jet holes (17) are uniformly arranged on the wall surface of the jet plate (16), the diameter range of the jet holes (17) is 1-2 mm, the diameter ratio range of adjacent jet holes (17) is 4-6, and condensation jet flows of channels to be measured with different sizes are effectively realized by adjusting parameters of the jet holes (17).
3. The experimental device according to claim 1, wherein the upper wall surface of the jet air inlet flute type pipe (13) is provided with uniform air supply holes (14), the diameter of the air supply holes (14) is 4-6 mm, the ratio of the axial distance of the air supply holes (14) to the diameter of the air supply holes (14) is 4-6, and the radial angle of the air supply holes (14) is 45-60 degrees.
4. The experimental device according to claim 1, wherein the limiting baffle (18) limits the detected channel (12) to be right below the jet hole (17), a jet area with a specific jet height is limited between the jet plate (16) and the detected channel (12), and the jet height takes a value which is 3-5 times the diameter of the jet hole (17).
5. The experimental device according to claim 1, characterized in that the air heater (22) is used for adjusting jet air intake temperature, and the bypass flow regulating valve (23) is used for adjusting jet air supply flow.
6. The experimental device according to claim 1, wherein the wall temperature sensors (19) are arranged in the jet flow area of the detected channel (12), and the ratio of the interval between the wall temperature sensors (19) to the diameter of the jet holes (17) ranges from 20 to 30, so as to feed back the local wall temperature of the detected channel (12).
7. The experimental device according to claim 1, wherein the cooling unit (36) can provide constant-temperature cooling liquid with adjustable temperature of-25 ℃ to 50 ℃ for the condenser (35), the condensation heat exchange temperature difference in the condenser (35) is controlled by adjusting the temperature of the cooling liquid, the control of the working pressure of the refrigerant in the refrigerant circulation system (3) is realized, and the temperature of the cooling liquid is fed back through the cooling liquid temperature sensor (37).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310452881.XA CN117619471A (en) | 2023-04-25 | 2023-04-25 | Condensation experimental device based on array jet impact |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310452881.XA CN117619471A (en) | 2023-04-25 | 2023-04-25 | Condensation experimental device based on array jet impact |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117619471A true CN117619471A (en) | 2024-03-01 |
Family
ID=90022341
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310452881.XA Pending CN117619471A (en) | 2023-04-25 | 2023-04-25 | Condensation experimental device based on array jet impact |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117619471A (en) |
-
2023
- 2023-04-25 CN CN202310452881.XA patent/CN117619471A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103884220B (en) | Be applicable to the oval fin with circular hole of fin tube type refrigerated heat exchanger under frozen condition | |
| Zhang et al. | Experimental investigation on the geometric structure with perforated baffle for thermal stratification of the water tank | |
| Siddiqui et al. | Experimental investigation of air side heat transfer and fluid flow performances of multi-port serpentine cross-flow mesochannel heat exchanger | |
| Park et al. | An experimental study on the effect of vertical header geometry on the two-phase refrigerant distribution and performance of a microchannel heat exchanger | |
| Matos et al. | Performance comparison of tube and plate-fin circular and elliptic heat exchangers for HVAC-R systems | |
| CN107729600B (en) | Evaporator simulation calculation method | |
| Yoshioka et al. | Performance evaluation and optimization of a refrigerant distributor for air conditioner | |
| CN117619471A (en) | Condensation experimental device based on array jet impact | |
| CN104374591A (en) | Capacity measuring device of electronic expansion valve | |
| JP5562649B2 (en) | Heat transfer device | |
| CN217179925U (en) | Jet flow micro-channel radiator test system | |
| CN110955984A (en) | Simulation method and system of plate heat exchanger | |
| CN113656967B (en) | Low-temperature helium tank radiation cold screen cooling optimization design method | |
| Hong et al. | Measurements of Frost Growth on Louvered Folded Fins of Microchannel Heat Exchangers, Part 1: Experimental Methodology. | |
| CN104374590A (en) | Capacity measuring device for four-way reversing valve | |
| CN109357873B (en) | Application method of heat exchanger and engine multi-state air inlet simulation test method | |
| Pamuk | CFD Simulation of a Shell and Tube Heat Exchanger | |
| Tang et al. | Thermal performance of a single-row fin-and-tube heat exchanger | |
| Liu et al. | Design and performance optimization of microchannel condensers for electric vehicles | |
| CN108956692B (en) | Dryness jump type evaporator thermodynamic performance calculation method and dryness measurement device thereof | |
| Glazar et al. | Experimental analysis of air-water heat exchanger with microchannel coil exposed to different working parameters | |
| CN204302018U (en) | A kind of ability measurement device of electric expansion valve | |
| CN204302017U (en) | A kind of ability measurement device of four-way change-over valve | |
| Denizli et al. | Modeling and Experimental Analysis of Interlaced Hot Glycol Defrost System | |
| Taler et al. | Inverse heat transfer problem in digital temperature control in plate fin and tube heat exchangers |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |