CN113959904A - Visual electric field enhanced microchannel boiling heat transfer experimental device - Google Patents
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Abstract
The invention provides a visual electric field enhanced microchannel boiling heat transfer experimental device, which comprises a microchannel boiling heat exchange testing device, a heat exchange working medium circulation loop device communicated with the microchannel boiling heat exchange testing device, an external electric field generating device electrically connected with the microchannel boiling heat exchange testing device, and a visual observation device for visually observing the testing process of the microchannel boiling heat exchange testing device; the microchannel boiling heat exchange testing device comprises a microchannel boiling heat exchanger, a single-end electric heating pipe which is detachably mounted on the microchannel boiling heat exchanger, and an adjustable power supply which is electrically connected with the single-end electric heating pipe. The invention utilizes the good light transmission and conductivity of the indium tin oxide conducting film, realizes the visual observation research on the boiling heat transfer of the electric field reinforced microchannel by means of the visual observation device, and has convenient operation and high test precision.
Description
Technical Field
The invention relates to the technical field of microchannel phase change enhanced heat transfer, in particular to a visual electric field enhanced microchannel boiling heat transfer experimental device.
Technical Field
In recent years, with the rapid development of microscale technology, very large scale integrated circuits increasingly receive wide attention in the fields of micro-electro-mechanical systems, aerospace, photoelectricity and the like, the rapid increase of the heat productivity of integrated circuit chips severely limits the performance of the integrated circuit chips, and thermally induced failure is the main failure form of microelectronic devices at present. Therefore, heat dissipation with high heat flux density is a major bottleneck to be broken through for efficient and stable operation of microelectronic devices, and is also one of the key technologies for development of the microelectronic industry.
Microchannel boiling heat exchangers combine the advantages of both microchannel heat exchangers and boiling cooling technologies: on one hand, the scale miniaturization can make up the defects that the traditional heat dissipation mode is large in equipment volume and difficult to efficiently cool in a limited space, so that the development trend of equipment miniaturization and compactness is met; on the other hand, the boiling heat transfer can effectively increase the heat exchange quantity and improve the temperature uniformity of the equipment, and the equipment is maintained at a proper working temperature, so that the efficient and stable operation of the equipment is ensured. With the increasing requirements of microelectronic devices on integration level, performance and reliability, many researchers are dedicated to develop enhanced heat transfer technologies suitable for microchannel boiling heat exchangers to further enhance the heat transfer performance thereof, thereby improving the effective utilization of energy. The electric field enhanced heat transfer technology has the advantages of good heat transfer enhancement effect, simplicity in operation, easiness in control, low power consumption, no moving parts and the like, can realize high-heat-flow-density heat dissipation, can adjust the heat dissipation capacity by controlling the electric field, and is an important way for solving the problem of efficient and stable operation of microelectronic devices.
The electric field enhanced boiling heat transfer mainly utilizes the electric field force to act on the bubble dynamics behaviors such as the formation, growth, separation, movement and the like of bubbles in the boiling process, improves the two-phase flow state in a channel and further achieves the effect of enhanced heat transfer. However, the influence mechanism and the heat exchange mechanism of the electric field enhanced microchannel flow boiling heat transfer are not described clearly, so that a visual electric field enhanced microchannel boiling heat transfer experimental device is needed to research the heat transfer and two-phase flow characteristics of the microchannel flow boiling under the action of an electric field.
The prior art is yet to be improved and developed.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a visual electric field enhanced microchannel boiling heat transfer experimental device which can systematically test and visually observe the heat transfer and two-phase flow characteristics of microchannel flow boiling under the action of an electric field.
The technical scheme of the invention is as follows:
a visual electric field enhanced microchannel boiling heat transfer experimental device comprises a microchannel boiling heat exchange testing device, a heat exchange working medium circulation loop device communicated with the microchannel boiling heat exchange testing device, an external electric field generating device electrically connected with the microchannel boiling heat exchange testing device, and a visual observation device for visually observing the testing process of the microchannel boiling heat exchange testing device; the microchannel boiling heat exchange testing device comprises a microchannel boiling heat exchanger, a single-end electric heating pipe which is detachably mounted on the microchannel boiling heat exchanger, and an adjustable power supply which is electrically connected with the single-end electric heating pipe.
The visual electric field enhanced microchannel boiling heat transfer experimental device comprises a microchannel boiling heat exchanger, a heat insulation body and a glass upper cover plate, wherein the microchannel boiling heat exchanger comprises a base heat insulation plate, the heat insulation body comprises an inlet and an outlet and the glass upper cover plate are stacked from bottom to top and are fixedly installed through fastening bolts and nuts; a red copper heat sink containing a micro-channel is arranged between the base heat insulation plate and the heat insulator containing the inlet and the outlet; a sealing gasket is arranged between the heat insulator with the inlet and the outlet and the red copper heat sink with the micro-channel; an indium tin oxide conducting film is arranged between the heat insulator with the inlet and the outlet and the glass upper cover plate, and a sealing ring is arranged between the indium tin oxide conducting film and the heat insulator with the inlet and the outlet.
The visual electric field enhanced micro-channel boiling heat transfer experimental device is characterized in that the indium tin oxide conducting film is used as an anode electrode and is electrically connected with the external electric field generating device, and the indium tin oxide conducting film is composed of a PET substrate and a high-resistance ITO thin film sputtered on the PET substrate.
The visual electric field enhanced microchannel boiling heat transfer experimental device is characterized in that the microchannel-containing red copper heat sink is used as a negative electrode and is electrically connected with the external electric field generating device, a microchannel is arranged at the top end of the microchannel-containing red copper heat sink, a temperature measuring hole for mounting a thermocouple is arranged in the middle of the microchannel-containing red copper heat sink, a boss for placing the sealing gasket is arranged on the position, between the microchannel and the temperature measuring hole, on the microchannel-containing red copper heat sink, and a heating hole for mounting the single-head electric heating pipe is arranged at the bottom of the microchannel-containing red copper heat sink; the microchannel consists of an array of 10-250 micro-boss structures.
The visual electric field enhanced microchannel boiling heat transfer experimental device comprises a heat insulation body and two flow stabilizing cavities, wherein the two flow stabilizing cavities are arranged at the left end and the right end of the heat insulation body; the top of the heat insulation body is provided with a groove for placing a sealing ring, and the middle of the heat insulation body is provided with a middle through body for placing the red copper heat sink containing the micro-channel.
The visual electric field enhanced microchannel boiling heat transfer experimental device comprises an optical moving platform for placing the microchannel boiling heat exchanger, an optical microscope and a high-speed camera, wherein the optical microscope and the high-speed camera are arranged above the microchannel boiling heat exchanger.
The visual electric field enhanced microchannel boiling heat transfer experimental device comprises an external electric field generating device and a visual electric field enhanced microchannel boiling heat transfer experimental device, wherein the external electric field generating device comprises a high-voltage amplifier and a signal generator electrically connected with the high-voltage amplifier, and the positive electrode and the negative electrode of the high-voltage amplifier are respectively and electrically connected with the indium tin oxide conducting film and the microchannel-containing red copper heat sink.
The visual electric field enhanced microchannel boiling heat transfer experimental device comprises a heat exchange working medium circulation loop device, a liquid storage tank, a filter, a circulation power device, a flowmeter and a preheating device, wherein the heat exchange working medium circulation loop device is sequentially communicated with the liquid storage tank through a pipeline and is used for cooling high-temperature heat exchange working media flowing out of a microchannel boiling heat exchanger, the liquid storage tank is used for storing the heat exchange working media, and the liquid injection device is communicated with the liquid storage tank through a pipeline.
The visual electric field enhanced micro-channel boiling heat transfer experimental device comprises a magnetic pump, a rotating speed regulator and a bypass needle valve, wherein the rotating speed regulator and the bypass needle valve are electrically connected with the magnetic pump.
The visual electric field enhanced microchannel boiling heat transfer experimental device further comprises a data acquisition device, wherein the data acquisition device comprises a thermocouple, a pressure sensor, a data acquisition unit and a computer.
Has the advantages that: the invention utilizes the good light transmission and conductivity of the indium tin oxide conducting film, and realizes the visual observation research of the electric field reinforced microchannel boiling heat transfer by means of the visual observation device; the provided visual electric field enhanced microchannel boiling heat transfer experimental device can be used for testing the two-phase flow characteristic and the heat transfer characteristic in the microchannel under the action of an external electric field in the boiling process, and has the advantages of convenient operation and high testing precision.
Drawings
Fig. 1 is a schematic structural diagram of a visual electric field enhanced microchannel boiling heat transfer experimental device.
Fig. 2 is an exploded schematic view of a microchannel boiling heat exchanger of the present invention.
FIG. 3 is a schematic structural diagram of an ITO conductive film according to an embodiment of the invention.
Fig. 4 is a schematic side view of a copper heat sink with micro-channels according to an embodiment of the present invention.
Fig. 5 is a schematic top view of a copper heat sink with micro-channels according to an embodiment of the present invention.
FIG. 6 is a schematic structural diagram of a gasket seal according to an embodiment of the present invention.
Fig. 7 is a schematic perspective view of an insulator with an inlet and an outlet according to an embodiment of the present invention.
Fig. 8 is a schematic cross-sectional view of an insulator including an access opening according to an embodiment of the present invention.
Detailed Description
The invention provides a visual electric field enhanced micro-channel boiling heat transfer experimental device, and the invention is further described in detail below in order to make the purpose, technical scheme and effect of the invention clearer and more clear and definite. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a visual electric field enhanced microchannel boiling heat transfer experimental device, as shown in the figure, the device comprises a microchannel boiling heat transfer testing device, a heat exchange working medium circulation loop device communicated with the microchannel boiling heat transfer testing device, an external electric field generating device electrically connected with the microchannel boiling heat transfer testing device, and a visual observation device for visually observing a testing process of the microchannel boiling heat transfer testing device; the microchannel boiling heat exchange testing device comprises a microchannel boiling heat exchanger 1, a single-end electric heating pipe 2 which is detachably mounted on the microchannel boiling heat exchanger 1, and an adjustable power supply 3 which is electrically connected with the single-end electric heating pipe 2. In this embodiment, the single-ended electric heating tube 2 and the adjustable power supply 3 provide the heating power required by the boiling heat exchange test of the micro-channel together.
In the embodiment, as shown in fig. 2, the microchannel boiling heat exchanger 1 includes a base heat insulation plate 1-8, an inlet and outlet heat insulation body 1-5 and a glass upper cover plate 1-2, which are stacked from bottom to top and fixedly mounted through a fastening bolt 1-1 and a nut 1-9; a red copper heat sink 1-7 with a micro-channel is arranged between the base heat insulation board 1-8 and the heat insulator 1-5 with the inlet and the outlet; a sealing gasket 1-6 is arranged between the heat insulator 1-5 containing the inlet and the outlet and the red copper heat sink 1-7 containing the micro-channel; an indium tin oxide conducting film 1-3 is arranged between the heat insulator 1-5 containing the inlet and the outlet and the glass upper cover plate 1-2, and a sealing ring 1-4 is arranged between the indium tin oxide conducting film 1-3 and the heat insulator 1-5 containing the inlet and the outlet.
In this embodiment, as shown in fig. 1 to fig. 3, the ITO conductive films 1 to 3 are used as positive electrodes to be electrically connected to the external electric field generating device, and the ITO conductive films 1 to 3 are composed of PET substrates 1 to 32 and ITO thin films 1 to 31 with high resistance sputtered on the PET substrates 1 to 32. The total resistance of the ITO conductive films 1-3 is 100k Ω -10M Ω, but not limited thereto. The high-resistance ITO films 1-31 with different structures are processed by a coating technology, so that the indium tin oxide conductive films 1-3 with different resistances can be obtained, the electric field distribution can be optimized, and a better heat exchange enhancement effect can be achieved. In the embodiment, the indium tin oxide conductive films 1-3 have strong light transmittance, and the good light transmittance of the indium tin oxide conductive films 1-3 can be utilized, so that the two-phase flow characteristic in the microchannel under the action of an external electric field in the boiling process can be observed and tested by means of a visual observation device.
In some embodiments, as shown in fig. 4 to 5, the micro-channel-containing red copper heat sink 1 to 7 is electrically connected to the external electric field generating device as a negative electrode, the top end of the micro-channel-containing red copper heat sink 1 to 7 is provided with micro-channels 1 to 71, the middle part of the micro-channel-containing red copper heat sink 1 to 7 is provided with temperature measuring holes 1 to 72 for installing thermocouples, the position of the micro-channel-containing red copper heat sink 1 to 7 between the micro-channels 1 to 71 and the temperature measuring holes 1 to 72 is provided with bosses 1 to 74 for placing the sealing gaskets 1 to 6, and the bottom of the micro-channel-containing red copper heat sink 1 to 7 is provided with heating holes 1 to 73 for installing the single-headed electric heating pipe 2; the micro-channels 1-71 are composed of an array of 10-250 micro-boss structures. In the present embodiment, the shape of the micro-mesa structure is one or more of a rectangle, a cylinder and a diamond, but is not limited thereto. The red copper heat sink 1-7 containing the micro-channel has the whole length of 30-50mm, the width of 20-40mm and the height of 30-50mm, and is connected with the negative electrode of the external electric field generating device through a copper wire.
In some embodiments, as shown in fig. 6, the sealing gaskets 1-6 are hollow rectangular gaskets made of silica gel, the length and width of the inner rectangle with respect to the length and width of the microchannel 1-71 are 0-0.5mm, the length and width of the outer rectangle with respect to the length and width of the boss 1-74 are 0.5-1mm, and the thickness of the sealing gasket 1-6 is 1-2 mm. In this embodiment, the fastening bolt 1-1 and the nut 1-9 are used for connecting the glass upper cover plate 1-2, the heat insulator 1-5 with the inlet and outlet and the base heat insulating plate 1-8, and the sealing gasket 1-6 arranged between the heat insulator 1-5 with the inlet and outlet and the heat sink 1-7 with the micro-channel copper is combined with the sealing ring 1-4 arranged between the indium tin oxide conductive film 1-3 and the heat insulator 1-5 with the inlet and outlet, so as to ensure the sealing performance of the micro-channel boiling heat exchanger.
In some embodiments, as shown in fig. 7-8, the heat insulator 1-5 with an inlet and an outlet includes a heat insulating body, and two current stabilizing cavities 1-51 disposed at the left and right ends of the heat insulating body, wherein one current stabilizing cavity is provided with a heat exchange working medium inlet 1-52, the other current stabilizing cavity is provided with a heat exchange working medium outlet 1-521, and the current stabilizing cavity 1-51 is further provided with a temperature measuring port 1-53 for mounting thermocouples 9-1 and 9-2 and a pressure measuring port 1-54 for connecting pressure sensors 10-1 and 10-2; the top of the heat insulation body is provided with grooves 1-55 for placing sealing rings 1-4, and the middle of the heat insulation body is provided with a middle through body 1-57 for placing the red copper heat sink 1-7 with the micro-channel, a sealing boss 1-58 and a heat insulation body temperature measurement hole 1-56 corresponding to the temperature measurement hole 1-72; the whole heat insulator 1-5 with the inlet and the outlet is integrally printed by a 3D printer and is made of high-temperature resin.
In some embodiments, the specific installation steps of the microchannel boiling heat exchanger 1 are as follows:
firstly, mounting a sealing gasket 1-6 on a boss 1-74 of a red copper heat sink 1-7 with a micro-channel; then installing the red copper heat sink 1-7 with the micro-channel and provided with the sealing gasket 1-6 into the middle through body 1-57 in the heat insulator 1-5 with the inlet and the outlet; then placing the installation body on a base heat insulation plate 1-8, and aligning the installation body with an inlet and outlet heat insulation body 1-5 and eight bolt holes on the base heat insulation plate 1-8;
then installing a sealing ring 1-4 on a groove 1-55 in the heat insulator 1-5 with the inlet and the outlet; then, an indium tin oxide conducting film 1-3 is placed on a heat insulator 1-5 with an inlet and an outlet and a sealing ring 1-4, and a flow channel of the micro-channel 1-71 is aligned with a high-resistance ITO film 1-31, so that the high-resistance ITO film 1-31 is not contacted with a metal part of the micro-channel 1-71;
then placing the organic glass upper cover plate 1-2 on the indium tin oxide conducting film 1-3 and the heat insulator with the inlet and the outlet 1-5, and aligning the organic glass upper cover plate 1-2 and the eight bolt holes on the heat insulator with the inlet and the outlet 1-5; finally, a fastening bolt 1-1 is installed in a bolt hole of the installation body and is screwed with a nut 1-9, wherein a groove 1-55 on the heat insulator 1-5 with an inlet and an outlet is sealed with a sealing ring 1-4 and an indium tin oxide conducting film 1-3 in a squeezing mode, a boss 1-74 on the red copper heat sink 1-7 with the micro-channel is sealed with a sealing gasket 1-6 and a sealing boss 1-58 on the heat insulator 1-5 with the inlet and the outlet in a squeezing mode, and therefore the overall sealing of the micro-channel boiling heat exchanger 1 is achieved.
In some embodiments, as shown in fig. 1, the visual observation device comprises an optical moving platform 4 for placing the microchannel boiling heat exchanger 1, an optical microscope 5 and a high-speed camera 6 arranged above the microchannel boiling heat exchanger 1. In this embodiment, the optical moving platform 4 can perform fine adjustment of displacement in three directions of the xyz axis. By combining the optical microscope 5 and the high-speed camera 6, the two-phase flow characteristic of the micro-channel flow boiling under the action of an external electric field can be observed in real time through the upper glass cover plate 1-2 of the micro-channel boiling heat exchanger 1.
In some embodiments, as shown in fig. 1, the external electric field generating device includes a high voltage amplifier 8 and a signal generator 7 electrically connected to the high voltage amplifier 8, wherein the positive and negative electrodes of the high voltage amplifier 8 are electrically connected to the indium tin oxide conductive films 1-3 and the copper heat sink 1-7 containing micro-channels, respectively. In this embodiment, a dc or ac low voltage signal is output through the signal generator 7, and then the low voltage signal is amplified into a desired high voltage signal through the high voltage amplifier 8, thereby providing a high voltage electric field in the micro-channel 1-71.
In some embodiments, as shown in fig. 1, the heat exchange working medium circulation loop device includes a cooling device for cooling the high-temperature heat exchange working medium flowing out of the microchannel boiling heat exchanger 1, a liquid storage tank 13 for storing the heat exchange working medium, a filter 14, a circulation power device, a flow meter 15, a preheating device, and a liquid injection device communicated with the liquid storage tank 13 through a pipeline. Wherein, the circulating power device comprises a magnetic pump 24, a rotating speed regulator 25 and a bypass needle valve 26 which are electrically connected with the magnetic pump 24; the preheating device comprises a preheater 27, an electric heating pipe 28 and an adjustable power supply 29; the liquid injection device comprises a vacuum pump 16, a liquid injection tank 17 and liquid injection ball valve groups 18-1-18-3; the cooling device comprises a condensing coil 19, a cooling water tank 20, a water cooler 21, an electric heating pipe 22 and an adjustable power supply 23.
In some embodiments, as shown in fig. 1, the visual electric field enhanced microchannel boiling heat transfer experimental apparatus further includes a data acquisition device, where the data acquisition device includes thermocouples 9-1 to 9-6, pressure sensors 10-1 to 10-3, a data acquisition unit 11, and a computer 12.
In some embodiments, before experimental tests, a heat exchange working medium is injected into the circulation loop through the liquid injection device, the ball valve 18-1 on the branch of the liquid injection tank in the liquid injection valve group is closed, the other valves 18-2 and 18-3 in the liquid injection valve group and the bypass needle valve 26 in the circulation power device are opened, and the vacuum pump 16 is opened to vacuumize the heat exchange working medium circulation loop; and closing the ball valve 18-2, and slowly opening the ball valve 18-1, so that the heat exchange working medium in the liquid injection tank 17 is filled in the circulation loop finally. During experimental tests, the liquid injection ball valve group 18-1-18-3 is closed, the magnetic pump 24 is started, so that heat exchange working medium flow in the liquid storage tank 13 enters the preheater 27 through the filter 14 and the flowmeter 15, the heat exchange working medium is heated in the preheater 27 to the measured inlet temperature and then enters the microchannel boiling heat exchange testing device for boiling heat transfer tests, the working medium after heat exchange enters the condensing coil 19 to exchange heat with cooling water in the cooling water tank 20 for condensation, and the condensed heat exchange working medium flows back to the liquid storage tank 13 for next circulation; the flow of the heat exchange working medium entering the boiling heat exchange testing device of the micro-channel can be comprehensively controlled by adjusting the rotating speed of the magnetic pump 24 and the opening degree of the bypass needle valve 26 through the rotating speed regulator 25; the heating quantity of the electric heating pipe 28 is adjusted by the adjustable power supply 29, so that the temperature of a heat exchange working medium inlet entering the microchannel boiling heat exchange testing device can be controlled; the heating quantity of the electric heating pipe 22 and the cooling quantity of the cooling water in the cooling water tank 20 are adjusted by the water cooler 21 through the adjustable power supply 23, and the pressure in the circulating loop can be comprehensively controlled.
When a boiling heat transfer test is carried out in the microchannel boiling heat exchange test device, a heat exchange working medium flows in the microchannel boiling heat exchanger 1 through the inlets 1-52 of the heat insulators 1-5, enters the microchannels 1-71 through the inlet flow stabilizing cavities 1-51, absorbs heat in the microchannels 1-71, then passes through the outlet flow stabilizing cavities 1-51, and finally flows out of the microchannel boiling heat exchanger 1 through the outlets 1-521. The heating quantity of the single-end electric heating pipe 2 is adjusted through the adjustable power supply 3, and the heat exchange quantity of a heat exchange working medium in the micro-channel boiling heat exchanger 1 can be controlled; the temperature of the inlet and the outlet of the heat exchange working medium in the micro-channel boiling heat exchanger 1 can be measured through thermocouples 9-1 and 9-2 arranged at the temperature measuring ports 1-53; the pressure sensors 10-1 and 10-2 are connected through pressure measuring ports 1-54, and the inlet and outlet pressures of the heat exchange working medium in the micro-channel boiling heat exchanger 1 can be measured; through a thermocouple 9-3 arranged at a temperature measuring hole 1-72 in the middle of a micro-channel red copper heat sink 1-7, the heat flux density and the wall surface temperature of a heat exchange working medium in the micro-channel boiling heat exchanger 1 can be calculated and obtained by utilizing the Fourier heat conduction law; indium tin oxide conductive films 1-3 and red copper heat sinks 1-7 in the microchannel boiling heat exchanger 1 are respectively connected with the positive electrode and the negative electrode of a high-voltage amplifier 7, a signal generator 8 is used for outputting direct current or alternating current low-voltage signals, and then the low-voltage signals are amplified into required high-voltage signals through the high-voltage amplifier 7, so that a high-voltage electric field is provided in the microchannels 1-71; the two-phase flow characteristic of the microchannel flowing and boiling under the action of an external electric field can be shot in real time through the upper glass cover plate 1-2 of the microchannel boiling heat exchanger 1 by combining the optical microscope 5 and utilizing the high-speed camera 6, and the microchannel boiling heat exchanger 1 is placed on the optical moving platform 4, so that the displacement in three directions of the xyz axis can be precisely adjusted.
In the experimental process, temperature, pressure and flow signals respectively measured by thermocouples 9-1 to 9-6, pressure sensors 10-1 to 10-3 and a flow meter 15 which are arranged on a microchannel boiling heat exchange testing device and a heat exchange working medium circulation loop device are collected by a data collector 11 and recorded and displayed on a computer 12; the video signal of the high-speed camera 6 and the voltage signal of the external electric field generating device are directly recorded and displayed on the computer 12.
In conclusion, the invention utilizes the good light transmittance and conductivity of the indium tin oxide conducting films 1-3, and realizes the visual observation research on the boiling heat transfer of the electric field enhanced microchannel by means of the visual observation device; the provided visual electric field enhanced micro-channel boiling heat transfer experimental device can be used for testing the two-phase flow characteristics and the heat transfer characteristics in the micro-channels 1-71 under the action of an external electric field in the boiling process, and is convenient to operate and high in testing precision.
It should be understood that the above-described embodiments of the present invention are illustrative of the present invention for clarity of description, and that various other changes and modifications may be suggested to one skilled in the art based on the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A visual electric field enhanced microchannel boiling heat transfer experimental device is characterized by comprising a microchannel boiling heat exchange testing device, a heat exchange working medium circulation loop device communicated with the microchannel boiling heat exchange testing device, an external electric field generating device electrically connected with the microchannel boiling heat exchange testing device, and a visual observation device for visually observing the testing process of the microchannel boiling heat exchange testing device; the microchannel boiling heat exchange testing device comprises a microchannel boiling heat exchanger, a single-end electric heating pipe which is detachably mounted on the microchannel boiling heat exchanger, and an adjustable power supply which is electrically connected with the single-end electric heating pipe.
2. The visual electric field enhanced microchannel boiling heat transfer experimental device as claimed in claim 1, wherein the microchannel boiling heat exchanger comprises a base heat insulation plate, a heat insulation body containing an inlet and an outlet, and a glass upper cover plate, which are stacked from bottom to top and fixedly mounted through fastening bolts and nuts; a red copper heat sink containing a micro-channel is arranged between the base heat insulation plate and the heat insulator containing the inlet and the outlet; a sealing gasket is arranged between the heat insulator with the inlet and the outlet and the red copper heat sink with the micro-channel; an indium tin oxide conducting film is arranged between the heat insulator with the inlet and the outlet and the glass upper cover plate, and a sealing ring is arranged between the indium tin oxide conducting film and the heat insulator with the inlet and the outlet.
3. The experimental apparatus for boiling and heat transfer of the visual electric field enhanced micro-channel according to claim 2, wherein the indium tin oxide conductive film is electrically connected to the external electric field generating device as a positive electrode, and the indium tin oxide conductive film comprises a PET substrate and a high-resistance ITO thin film sputtered on the PET substrate.
4. The visual electric field enhanced microchannel boiling heat transfer experimental device according to claim 2, wherein the microchannel-containing red copper heat sink is electrically connected with the external electric field generating device as a negative electrode, the top end of the microchannel-containing red copper heat sink is provided with a microchannel, the middle part of the microchannel-containing red copper heat sink is provided with a temperature measuring hole for installing a thermocouple, a boss for placing the sealing gasket is arranged on the position between the microchannel and the temperature measuring hole on the microchannel-containing red copper heat sink, and the bottom of the microchannel-containing red copper heat sink is provided with a heating hole for installing the single-head electric heating pipe; the microchannel consists of an array of 10-250 micro-boss structures.
5. The visual electric field enhanced microchannel boiling heat transfer experimental device as claimed in claim 2, wherein the heat insulator with the inlet and the outlet comprises a heat insulation body, and two flow stabilizing cavities arranged at the left and right ends of the heat insulation body, wherein one flow stabilizing cavity is provided with a heat exchange working medium inlet, the other flow stabilizing cavity is provided with a heat exchange working medium outlet, and the flow stabilizing cavity is further provided with a temperature measuring port for mounting a thermocouple and a pressure measuring port for connecting a pressure sensor; the top of the heat insulation body is provided with a groove for placing a sealing ring, and the middle of the heat insulation body is provided with a middle through body for placing the red copper heat sink containing the micro-channel.
6. The experimental device for the boiling and heat transfer of the visual electric field enhancement microchannel as claimed in claim 1, wherein the visual observation device comprises an optical moving platform for placing the microchannel boiling heat exchanger, an optical microscope and a high-speed camera which are arranged above the microchannel boiling heat exchanger.
7. The visual electric field enhanced microchannel boiling heat transfer experimental device of claim 2, wherein the external electric field generating device comprises a high voltage amplifier and a signal generator electrically connected with the high voltage amplifier, and the positive and negative electrodes of the high voltage amplifier are electrically connected with the indium tin oxide conductive film and the copper heat sink containing the microchannel respectively.
8. The visual electric field enhanced microchannel boiling heat transfer experimental device as claimed in claim 1, wherein the heat exchange working medium circulation loop device comprises a cooling device, a liquid storage tank, a filter, a circulation power device, a flowmeter and a preheating device, which are sequentially communicated through a pipeline and used for cooling the high-temperature heat exchange working medium flowing out of the microchannel boiling heat exchanger, and further comprises a liquid injection device communicated with the liquid storage tank through a pipeline.
9. The experimental device for boiling and heat transfer of the visual electric field enhanced microchannel according to claim 8, wherein the circulation power device comprises a magnetic pump, and a rotation speed regulator and a bypass needle valve which are electrically connected with the magnetic pump.
10. The experimental apparatus for boiling and heat transfer of the visual electric field enhanced microchannel according to claim 1, further comprising a data acquisition device, wherein the data acquisition device comprises a thermocouple, a pressure sensor, a data acquisition unit and a computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202111289748.4A CN113959904A (en) | 2021-11-02 | 2021-11-02 | Visual electric field enhanced microchannel boiling heat transfer experimental device |
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| CN202111289748.4A CN113959904A (en) | 2021-11-02 | 2021-11-02 | Visual electric field enhanced microchannel boiling heat transfer experimental device |
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| CN202111289748.4A Pending CN113959904A (en) | 2021-11-02 | 2021-11-02 | Visual electric field enhanced microchannel boiling heat transfer experimental device |
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2021
- 2021-11-02 CN CN202111289748.4A patent/CN113959904A/en active Pending
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