CN112113995B - Low-pressure micro-channel gas-liquid two-phase flow heat dissipation test system and method - Google Patents
Low-pressure micro-channel gas-liquid two-phase flow heat dissipation test system and method Download PDFInfo
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- 239000007788 liquid Substances 0.000 title claims abstract description 133
- 230000005514 two-phase flow Effects 0.000 title claims abstract description 120
- 230000017525 heat dissipation Effects 0.000 title claims abstract description 103
- 238000012360 testing method Methods 0.000 title claims abstract description 74
- 238000000034 method Methods 0.000 title abstract description 13
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims abstract description 50
- 229910052731 fluorine Inorganic materials 0.000 claims abstract description 50
- 239000011737 fluorine Substances 0.000 claims abstract description 50
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 31
- 238000004088 simulation Methods 0.000 claims abstract description 24
- 238000006243 chemical reaction Methods 0.000 claims abstract description 22
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- 230000003139 buffering effect Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
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- 230000006641 stabilisation Effects 0.000 description 3
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Abstract
The invention discloses a low-pressure micro-channel gas-liquid two-phase flow heat dissipation test system and a method. The system comprises a micro-channel gas-liquid two-phase flow heat radiating device, an internal reaction environment simulation part arranged at an inlet and an outlet environment simulation part arranged at an outlet. The internal reaction environment simulation part comprises a pressure gauge, a third ball valve, a transparent fluorine-filled tube, a second ball valve, an airtight vacuum tank provided with the pressure gauge, a first ball valve, the transparent fluorine-filled tube and a vacuum pump which are sequentially connected forward at an inlet; the outlet environment simulation part comprises a constant-pressure one-way valve, a transparent fluorine filling pipe, a fourth ball valve, a pressure stabilizing tank, a fifth ball valve, a transparent fluorine filling pipe, a sixth ball valve, an airtight vacuum tank with a pressure gauge, a seventh ball valve, a transparent fluorine filling pipe and a vacuum pump which are sequentially connected at the outlet. After the test system is built, two modes of switching are simulated and parameterized according to the actual working environment. The invention has simple structure, high test efficiency and strong controllability and universality.
Description
Technical Field
The invention belongs to the technical field of temperature control research of high-power missile-borne electronic equipment, and particularly relates to a low-pressure micro-channel gas-liquid two-phase flow heat dissipation test system and method.
Background
With the daily and monthly variation of functions and modeling of electronic devices in various industries, the heat flux density of the electronic devices is rapidly increased, the heat dissipation problem is related to the running stability and reliability of related equipment, the heat dissipation problem of the electronic devices is increasingly prominent, and the more mature heat dissipation technology comprises air cooling and liquid cooling heat dissipation, but the two heat dissipation modes have limited capabilities under certain conditions, the air cooling has poorer effect on the problem of high heat flux density, the liquid cooling equipment system is complex, and the space requirement is more. In particular, in the technical field of aerospace electronics, when a certain high-power missile-borne electronic device is studied, space, size and weight restrictions are strict, and the device cannot be provided with heat dissipation modes such as air cooling, water cooling and the like.
The liquid working medium absorbs heat, can instantaneously absorb a large amount of heat during gasification phase change, has high heat exchange efficiency, can absorb a large amount of heat in a short time by using less working medium, and provides a phase change heat dissipation mode by using the physical phenomenon, wherein the micro-channel gas-liquid two-phase flow heat dissipation mode can be well applied to cooling of electronic equipment with small size, light weight and high heat flow density.
The micro-channel gas-liquid two-phase flow heat dissipation comprises a circulating gas-liquid two-phase flow heat dissipation mode and a non-circulating gas-liquid two-phase flow heat dissipation mode, and the heat dissipation problem can be solved due to the fact that the missile-borne equipment is high in power consumption, short in working time, strict in weight requirement, high in heat exchange efficiency when the non-circulating gas-liquid two-phase flow heat dissipation mode is short, and light in weight. However, the heat absorption phase change process of the liquid working medium is complex, the relationship with the physical characteristics of the working medium, the ambient temperature, the ambient pressure and the like is close, the design of the existing scheme is mostly based on the simulation calculation of an empirical formula, great errors exist in precision, a large number of tests are needed to study the performances of each aspect of the micro-channel gas-liquid two-phase flow heat dissipation device, so that the engineering use risk is reduced, and the integral reliability of the device is improved. The test systems of the commonly used low-pressure micro-channel gas-liquid two-phase flow heat dissipation device mainly comprise two main types: 1. the circulation test system comprises a condenser and a compressor, and the pump drives working medium to flow; 2. and a test system for simulating the high-altitude atmospheric environment by utilizing the vacuum experimental cabin. There are a number of disadvantages to these two types of test systems available:
1. the device has single function, can only realize a certain function in real environment simulation or parameterization research, and is easy to leak working medium and contact with equipment for live working, and has poor use environment friendliness and safety;
2. the system has complex structure and low test efficiency, and complex parameter adjustment and control procedures and complicated operation are realized for multi-parameter research;
3. the vacuum cabin test system has the advantages that equipment is expensive, special personnel are required to operate, parameter adjustment is time-consuming and labor-consuming, repeated tests are required to consume a large amount of manpower and material resources, and the vacuum cabin test system is generally installed in a specific place.
Disclosure of Invention
The invention provides a low-pressure micro-channel gas-liquid two-phase flow heat dissipation test system and a method with low cost, complete functions, high efficiency, convenience, safety and environmental protection.
The technical solution for realizing the purpose of the invention is as follows: a low-pressure microchannel gas-liquid two-phase flow heat dissipation test system comprises a microchannel gas-liquid two-phase flow heat dissipation device, an internal reaction environment simulation part arranged at an inlet of the microchannel gas-liquid two-phase flow heat dissipation device, and an outlet environment simulation part arranged at an outlet; the whole test system forms a closed flow channel;
the micro-channel gas-liquid two-phase flow heat dissipation device is used as a tested piece, and the internal reaction environment simulation part comprises a second pressure gauge, a third ball valve, a second transparent fluorine-filled pipe, a second ball valve, a first large-volume airtight vacuum tank provided with a first pressure gauge, a first ball valve, a first transparent fluorine-filled pipe and a first vacuum pump which are sequentially connected forward at an inlet; the outlet environment simulation part comprises a constant-pressure one-way valve, a third transparent fluorine-filled pipe, a fourth ball valve, a pressure stabilizing tank, a fifth ball valve, a fourth transparent fluorine-filled pipe, a sixth ball valve, a second large-volume airtight vacuum tank provided with a third pressure gauge, a seventh ball valve, a fifth transparent fluorine-filled pipe and a second vacuum pump which are sequentially connected at the outlet.
Further, an electric heating plate and a temperature sensor are arranged on a bottom runner flat plate of the micro-channel gas-liquid two-phase flow heat dissipation device; the electric heating sheet is connected with a voltage regulator through an electric wire and then connected to a 220V power supply; the temperature sensor is connected to the data acquisition instrument through a data line and then transmitted to the computer software through a network cable.
Further, the diameters of the first to fifth transparent fluorine filling pipes and the first to seventh ball valves are equal and are all 5mm.
Further, absorbing liquid which is compatible with the working medium is filled in the pressure stabilizing tank, the working medium is discharged to the pressure stabilizing tank to be contacted with the absorbing liquid after absorbing heat and phase, and is dissolved and absorbed, so that the outlet environment pressure is stabilized, and the outlet two-phase flow working medium is isolated from an electrified instrument and an external environment.
Further, the micro-channel gas-liquid two-phase flow heat dissipation device is fixed on the tool support.
A low-pressure micro-channel gas-liquid two-phase flow heat dissipation test method comprises the following steps:
step 1, connecting a second pressure gauge at an inlet of a micro-channel gas-liquid two-phase flow heat radiating device, connecting a second ball valve through a third ball valve and a second transparent fluorine filling pipe, installing the second ball valve at an outlet end of a first large-volume airtight vacuum tank provided with a first pressure gauge, installing a first ball valve at an inlet end, and finally connecting a first vacuum pump through the first transparent fluorine filling pipe;
step 2, the outlet of the micro-channel gas-liquid two-phase flow heat dissipation device is firstly connected with a constant pressure one-way valve, the opening and closing of the outlet of the device are controlled, the fourth ball valve is connected with a fourth ball valve through a third transparent fluorine filling pipe, the fourth ball valve is arranged at the inlet end of a pressure stabilizing tank, the outlet end of the pressure stabilizing tank is provided with a fifth ball valve, the fourth ball valve is connected with a sixth ball valve through a fourth transparent fluorine filling pipe, the sixth ball valve is arranged at the inlet end of a second large-volume airtight vacuum tank provided with a third pressure gauge, the outlet end of the second large-volume airtight vacuum tank is provided with a seventh ball valve, and finally the fourth ball valve is connected with a second vacuum pump through a fifth transparent fluorine filling pipe;
step 3, attaching an electric heating sheet to a bottom runner flat plate of the micro-channel gas-liquid two-phase flow heat dissipation device through heat conduction silicone grease, and connecting the electric heating sheet to a voltage regulator through an electric wire and then to a 220V power supply; a temperature sensor is arranged on a bottom runner flat plate of the micro-channel gas-liquid two-phase flow heat radiating device by using a high-temperature adhesive tape, is connected to a data acquisition instrument by a data line and is transmitted to computer software by a network cable; finally, fixing the micro-channel gas-liquid two-phase flow heat dissipation device on the tool support;
and 4, after the test system is built, switching between two functional modes according to the requirement, wherein the two functional modes comprise an actual working environment simulation mode of the micro-channel gas-liquid two-phase flow heat dissipation device and a parameterized research mode of the micro-channel gas-liquid two-phase flow heat dissipation device.
Further, the actual working environment simulation mode of the micro-channel gas-liquid two-phase flow heat dissipation device is as follows:
after the pressure of the reaction environment in the tested piece, namely the micro-channel gas-liquid two-phase flow heat radiator is regulated to a value required by a test, closing a third ball valve at the inlet; the outlet of the micro-channel gas-liquid two-phase flow heat dissipation device is communicated with the pressure stabilizing tank and the second large-volume airtight vacuum tank, and after the internal pressure is regulated to a value required by a test, the ambient pressure of the outlet of the micro-channel gas-liquid two-phase flow heat dissipation device is simulated; regulating the voltage of the voltage regulator, and controlling the heat consumption of the electric heating sheet; and (3) observing the temperature value transmitted to a computer by the data acquisition instrument, and monitoring the temperature of the heat source and the jet time of the gas-liquid two-phase flow.
Further, the parameterized research mode of the microchannel gas-liquid two-phase flow heat dissipation device is as follows:
the method comprises the steps of adjusting the internal reaction environment pressure of a tested piece, namely a micro-channel gas-liquid two-phase flow heat-dissipating device to a value required by a test, communicating a first large-volume airtight vacuum tank control inlet pressure parameter, adjusting the outlet pressure of the micro-channel gas-liquid two-phase flow heat-dissipating device to a value required by the test, communicating a pressure stabilizing tank and a second large-volume airtight vacuum tank control outlet pressure parameter, adjusting the voltage of a voltage regulator, and controlling the heat consumption of an electric heating sheet; and observing the temperature value transmitted to the computer by the data acquisition instrument, and monitoring the temperature change of the heat source.
Compared with the prior art, the invention has the remarkable advantages that:
(1) The functionality is strong, and the security and the environmental protection are good: the local device combination achieves the modularization function, and comprises the steps of simulating different pressure environments, simulating heat consumption of electronic devices, data acquisition and absorption voltage stabilization, so that parameterization research is guaranteed, a real air pressure environment can be simulated, and meanwhile, phase change working mediums in the micro-channel air-liquid two-phase flow heat dissipation device are effectively prevented from contacting an electrified working instrument and an external environment, and are discharged randomly to pollute the environment;
(2) Reasonable in design is orderly, and simple structure is compact, and the commonality is strong: the key test conditions are grasped, the test system is formed by constructing a micro-channel gas-liquid two-phase flow heat dissipation device from the inlet and the outlet to the two sides from the middle, the conditions of all devices can be controlled independently, the adjustment method is simple and convenient, the test system can be applied to test tests of different gas-liquid two-phase flow heat dissipation devices in an expanding mode, and the test system has good universality;
(3) The test efficiency is high, the cost is low, and the controllability is good: compared with a vacuum cabin laboratory, the test equipment is simple, common and low in cost, the test operation is easy to carry out, the repeated multi-parameter study can be rapidly realized, and the test equipment can be built in a common scientific research place and has strong controllability.
Drawings
FIG. 1 is a schematic diagram of a low pressure microchannel gas-liquid two-phase flow heat dissipation test system according to the present invention.
FIG. 2 is a schematic diagram of the principle of the invention for stabilizing the absorption liquid.
FIG. 3 is a heat source temperature versus time graph of an embodiment of the present invention.
FIG. 4 is a heat source temperature versus time graph of an embodiment of the present invention.
Detailed Description
The invention relates to a low-pressure microchannel gas-liquid two-phase flow heat dissipation test system, which comprises a microchannel gas-liquid two-phase flow heat dissipation device 1, an internal reaction environment simulation part arranged at the inlet of the microchannel gas-liquid two-phase flow heat dissipation device 1, and an outlet environment simulation part arranged at the outlet; the whole test system forms a closed flow channel;
the micro-channel gas-liquid two-phase flow heat dissipation device 1 is used as a tested piece, and the internal reaction environment simulation part comprises a second pressure gauge 7-2, a third ball valve 9-3, a second transparent fluorine-filled pipe 8-2, a second ball valve 9-2, a first large-volume airtight vacuum tank 3-1 provided with a first pressure gauge 7-1, a first ball valve 9-1, a first transparent fluorine-filled pipe 8-1 and a first vacuum pump 2-1 which are sequentially connected forward at an inlet; the outlet environment simulation part comprises a constant-pressure one-way valve 10, a third transparent fluorine-filled pipe 8-3, a fourth ball valve 9-4, a pressure stabilizing tank 4, a fifth ball valve 9-5, a fourth transparent fluorine-filled pipe 8-4, a sixth ball valve 9-6, a second large-volume airtight vacuum tank 3-2 provided with a third pressure gauge 7-3, a seventh ball valve 9-7, a fifth transparent fluorine-filled pipe 8-5 and a second vacuum pump 2-2 which are sequentially connected at the outlet.
Further, an electric heating plate 12 and a temperature sensor 13 are arranged on a bottom runner plate of the microchannel gas-liquid two-phase flow heat sink 1; the electric heating sheet 12 is connected with the voltage regulator 5 through an electric wire and then connected to a 220V power supply; the temperature sensor 13 is connected to the data acquisition instrument 6 through a data line and then transmitted to computer software through a network line.
Further, the diameters of the first to fifth transparent fluorine-filled tubes 8-1, 8-2, 8-3, 8-4, 8-5 and the first to seventh ball valves 9-1, 9-2, 9-3, 9-4, 9-5, 9-6 and 9-7 are equal and are all 5mm.
Further, the pressure stabilizing tank 4 is filled with an absorption liquid which is compatible with the working medium, the working medium absorbs heat and changes phase and is discharged to the pressure stabilizing tank 4 to be contacted with the absorption liquid and dissolved and absorbed, the ambient pressure of an outlet is stabilized, and the working medium of the outlet two-phase flow is isolated from an electrified instrument and the outside environment.
Further, the microchannel gas-liquid two-phase flow heat dissipation device 1 is fixed on the tool support 11.
The invention relates to a low-pressure micro-channel gas-liquid two-phase flow heat dissipation test method, which comprises the following steps:
step 1, connecting a second pressure gauge 7-2 at the inlet of a micro-channel gas-liquid two-phase flow heat radiating device 1, connecting the second ball valve 9-2 through a third ball valve 9-3 and a second transparent fluorine filling pipe 8-2, installing the second ball valve 9-2 at the outlet end of a first large-volume airtight vacuum tank 3-1 provided with a first pressure gauge 7-1, installing a first ball valve 9-1 at the inlet end, and finally connecting the first vacuum pump 2-1 through the first transparent fluorine filling pipe 8-1;
step 2, the outlet of the micro-channel gas-liquid two-phase flow heat dissipation device 1 is firstly connected with a constant pressure one-way valve 10, the opening and closing of the outlet of the device are controlled, the fourth ball valve 9-4 is connected through a third transparent fluorine filling pipe 8-3, the fourth ball valve 9-4 is arranged at the inlet end of the pressure stabilizing tank 4, the outlet end of the pressure stabilizing tank 4 is provided with a fifth ball valve 9-5, the sixth ball valve 9-6 is connected through the fourth transparent fluorine filling pipe 8-4, the sixth ball valve 9-6 is arranged at the inlet end of a second large-volume airtight vacuum tank 3-2 provided with a third pressure gauge 7-3, the outlet end is provided with a seventh ball valve 9-7, and finally the fourth ball valve 9-4 is connected with a second vacuum pump 2-2 through a fifth transparent fluorine filling pipe 8-5;
step 3, sticking an electric heating plate 12 on a bottom runner flat plate of the micro-channel gas-liquid two-phase flow heat radiation device 1 through heat conduction silicone grease, wherein the electric heating plate 12 is connected with a voltage regulator 5 through an electric wire and then connected with a 220V power supply; a temperature sensor 13 is arranged on a bottom runner flat plate of the micro-channel gas-liquid two-phase flow heat dissipation device 1 by using a high-temperature adhesive tape, the temperature sensor 13 is connected to a data acquisition instrument 6 through a data line, and then is transmitted to computer software through a network line; finally, fixing the micro-channel gas-liquid two-phase flow heat dissipation device 1 on the tool support 11;
and 4, after the test system is built, switching between two functional modes according to the requirement, wherein the two functional modes comprise an actual working environment simulation mode of the micro-channel gas-liquid two-phase flow heat dissipation device 1 and a parameterized research mode of the micro-channel gas-liquid two-phase flow heat dissipation device 1.
Further, the actual working environment simulation mode of the micro-channel gas-liquid two-phase flow heat dissipation device 1 is as follows:
after the pressure of the reaction environment in the tested piece, namely the micro-channel gas-liquid two-phase flow heat dissipation device 1, is adjusted to a value required by a test, the third ball valve 9-3 at the inlet is closed; the outlet of the micro-channel gas-liquid two-phase flow heat dissipation device 1 is communicated with the pressure stabilizing tank 4 and the second large-volume airtight vacuum tank 3-2, and after the internal pressure is regulated to a value required by a test, the ambient pressure of the outlet of the micro-channel gas-liquid two-phase flow heat dissipation device 1 is simulated; regulating the voltage of the voltage regulator 5 to control the heat consumption of the electric heating plate 12; and the temperature value transmitted to a computer by the data acquisition instrument 6 is observed, and the heat source temperature and the gas-liquid two-phase flow injection time length are monitored.
Further, the parameterized research mode of the micro-channel gas-liquid two-phase flow heat dissipation device 1 is specifically as follows:
the method comprises the steps of adjusting the internal reaction environment pressure of a tested piece, namely the micro-channel gas-liquid two-phase flow heat dissipation device 1, to a value required by a test, controlling inlet pressure parameters by communicating a first large-volume airtight vacuum tank 3-1, adjusting the outlet pressure of the micro-channel gas-liquid two-phase flow heat dissipation device 1 to a value required by the test, controlling outlet pressure parameters by communicating a pressure stabilizing tank 4 and a second large-volume airtight vacuum tank 3-2, adjusting the voltage of a voltage regulator 5, and controlling the heat consumption of an electric heating plate 12; the temperature value transmitted to the computer by the data acquisition instrument 6 is observed, and the temperature change of the heat source is monitored.
Referring to fig. 1, the micro-channel gas-liquid two-phase flow heat dissipation device 1 is a tested piece, the inlet is firstly connected with a second pressure gauge 7-2, the inlet pressure is monitored, then connected with a third ball valve 9-3, the isolation of the micro-channel gas-liquid two-phase flow heat dissipation device 1 at the inlet is ensured, the liquid injection into the micro-channel gas-liquid two-phase flow heat dissipation device 1 is facilitated, the device inlet is closed as required, then the first large-volume airtight vacuum tank 3-1 is connected through a second transparent fluorine filling pipe 8-2 and the second ball valve 9-2, and finally the first vacuum pump 2-1 is connected through the first ball valve 9-1 and the first transparent fluorine filling pipe 8-1. The part simulates the internal reaction environment of the micro-channel gas-liquid two-phase flow heat dissipation device.
The outlet of the micro-channel gas-liquid two-phase flow heat dissipation device 1 is firstly connected with a constant pressure one-way valve 10, and the outlet of the device is controlled to open and close under the condition of meeting specific pressure; then the third transparent fluorine filling pipe 8-3 and the fourth ball valve 9-4 are connected with the pressure stabilizing tank 4; the pressure stabilizing tank 4 is connected with the second large-volume airtight vacuum tank 3-2 through a fifth ball valve 9-5, a fourth transparent fluorine filling pipe 8-4 and a sixth ball valve 9-6, and finally is connected with the second vacuum pump 2-2 through a seventh ball valve 9-7 and the fifth transparent fluorine filling pipe 8-5, and the part simulates the outlet environment of the micro-channel gas-liquid two-phase flow heat dissipation device 1.
The electric heating plate 12 is tightly attached to the flow channel board at the bottom of the micro-channel gas-liquid two-phase flow heat dissipation device 1 through heat conduction silicone grease, the heating of electronic devices is simulated, the electric heating plate 12 is connected with the voltage regulator 5, the power supply voltage is regulated to change the heating value of the electric heating plate 12, and the heat loads of different electronic devices are simulated; the bottom of the micro-channel gas-liquid two-phase flow heat dissipation device 1 is provided with a temperature sensor 13, the temperature sensor 13 is connected with the data acquisition instrument 6, and then the temperature sensor is displayed by computer software to visually observe the temperature change of a heat source in the test process.
The parts of the test system have different functions and combine with each other to complete the double test function. 1. The actual high-altitude working environment mode of the micro-channel gas-liquid two-phase flow heat radiation device 1 is simulated, namely, an inlet is closed, and an outlet is connected with a constant-pressure one-way valve and then is directly connected with the external atmosphere: after the pressure of the reaction environment in the device is regulated to a value required by a test, closing a ball valve at an inlet to ensure that the inlet is closed; after the outlet environmental pressure of the device is regulated to a value required by a test, the buffer and absorption of a large-volume airtight vacuum tank and a pressure stabilizing tank are utilized to keep the outlet pressure stable. 2. Parameterized research mode, namely controlling internal reaction environment, outlet environment pressure value and thermal load at a certain stable value by a single test, and researching heat dissipation performance of the device: after the internal reaction environment pressure of the micro-channel gas-liquid two-phase flow heat-dissipating device is regulated to a value required by a test, the buffer of a large-volume airtight vacuum tank is utilized to ensure the stable internal reaction environment pressure in the test process; after the outlet ambient pressure of the micro-channel gas-liquid two-phase flow heat-dissipating device is regulated to a value required by a test, the stability of the outlet ambient pressure in the test process is ensured by utilizing the buffer of a large-volume airtight vacuum tank and the absorption of a surge tank; simulating the thermal load of the electronic component by controlling the voltage of the voltage regulator; and (3) researching the influence of internal reaction environment pressure, outlet environment pressure and heat load parameters on the heat radiation performance of the micro-channel gas-liquid two-phase flow heat radiation device through repeated experiments.
The working medium at the inlet of the micro-channel gas-liquid two-phase flow heat-dissipating device 1 is a pure liquid phase, the volume of the liquid phase is far smaller than the volume of a large-volume airtight vacuum tank, the influence of the volume change of the working medium on the pressure in the vacuum tank is negligible, the pressure buffering effect can be achieved by only using one large-volume airtight vacuum tank, the pressure control and pressure stabilization are realized, the liquid phase can not be contacted with a vacuum pump or even the outside environment, and the micro-channel gas-liquid two-phase flow heat-dissipating device is safe and environment-friendly; the outlet is gas-liquid two-phase flow, because the gasification volume of working medium expands sharply, along with the injection of two-phase flow, the pressure in a single large-volume airtight vacuum tank rises obviously, the pressure buffering effect is lost, and a considerable part of working medium enters a vacuum pump for live working, the safety and environmental protection performance are poor, therefore, a pressure stabilizing tank is connected between the outlet of a micro-channel gas-liquid two-phase flow heat dissipation device and the large-volume airtight vacuum tank, a certain amount of low-temperature absorption liquid with good compatibility with the working medium is injected into the pressure stabilizing tank, the gas-liquid two-phase flow reaches the pressure stabilizing tank in the first time after the heat absorption phase change of the working medium, and is in large-area contact with the absorption liquid in the pressure stabilizing tank to be dissolved, and only a very small part of working medium enters the large-volume airtight vacuum tank, thereby playing the roles of isolating the working medium and the live working instrument and the pressure buffering effect, improving the test safety, and realizing pressure control and pressure stabilization.
The invention is described in detail below with reference to the attached drawing figures and examples:
examples
The invention relates to a low-pressure micro-channel gas-liquid two-phase flow heat dissipation test system, as shown in fig. 1 and 2, a micro-channel gas-liquid two-phase flow heat dissipation device 1 is a tested piece, the device takes absolute ethyl alcohol as a heat dissipation working medium, when in high-altitude actual work, an inlet is closed, an outlet is directly communicated with an external environment after being connected with a constant-pressure valve, the external high-air pressure is 10KPa constant, the heat consumption is 240W, the required continuous working time is 13.5min, and the highest temperature of a heat source is about 60 ℃. The system of the invention is firstly used for simulating the working mode and the air pressure environment at a certain height, testing the short-time heat dissipation performance of the system under the high-altitude low-pressure environment, and then carrying out a group of parameter research tests to verify the effect of the test system of the invention.
First a test system was built according to the arrangement of fig. 1. The inlet of a micro-channel gas-liquid two-phase flow heat dissipation device 1 is connected with a second pressure meter 7-2, then is connected with the second ball valve 9-2 through a third ball valve 9-3 and a second transparent fluorine filling pipe 8-2, the second ball valve 9-2 is arranged at the outlet end of a 100L first large-volume airtight vacuum tank 3-1 provided with a first pressure meter 7-1, the inlet end of the second ball valve is provided with a first ball valve 9-1, and finally is connected with a first vacuum pump 2-1 through the first transparent fluorine filling pipe 8-1; the outlet is firstly connected with a constant pressure one-way valve 10, the opening and closing of the outlet of the device are controlled, the fourth ball valve 9-4 is connected through a third transparent fluorine filling pipe 8-3, the fourth ball valve 9-4 is arranged at the inlet end of the 30L pressure stabilizing tank 4, the outlet end of the fourth ball valve is provided with a fifth ball valve 9-5, the sixth ball valve 9-6 is connected through the fourth transparent fluorine filling pipe 8-4, the sixth ball valve 9-6 is arranged at the inlet end of a 100L second large-volume airtight vacuum tank 3-2 provided with a third pressure gauge 7-3, the outlet end of the sixth ball valve is provided with a seventh ball valve 9-7, and finally the fourth ball valve 9-5 is connected with a second vacuum pump 2-2 through a fifth transparent fluorine filling pipe 8-5. The diameter of each transparent fluorine filling pipe and the ball valve is 5mm.
The electric heating plate 12 is stuck to a bottom runner flat plate of the micro-channel gas-liquid two-phase flow heat radiation device 1 through heat conduction silicone grease, and the electric heating plate 12 is connected with the voltage regulator 5 through an electric wire and then connected to a 220V power supply; a temperature sensor 13 is arranged on a bottom runner flat plate of the micro-channel gas-liquid two-phase flow heat dissipation device 1 by using a high-temperature adhesive tape, the temperature sensor 13 is connected to a data acquisition instrument 6 through a data line, and then is transmitted to computer software through a network line; finally, the micro-channel gas-liquid two-phase flow heat dissipation device 1 is fixed on the tool support 11.
After the equipment test system is built, the real working environment of the device is firstly simulated, and the heat dissipation performance is tested: according to physical and chemical properties of the absolute ethyl alcohol, selecting purified water as an absorption liquid, weighing 270g of absolute ethyl alcohol working medium by an electronic scale according to a calculated value, completely injecting the absolute ethyl alcohol working medium into a liquid storage chamber of the micro-channel gas-liquid two-phase flow heat dissipation device 1, and then regulating the internal reaction environment pressure of the micro-channel gas-liquid two-phase flow heat dissipation device 1 to P in =61 kPa, third ball valve 9-3 at the closing device inlet; regulating the outlet ambient pressure to P O =10kpa; setting the on-pressure of the constant-pressure check valve 10 to Δp=p in -P O =57 kPa; after checking the safety of the circuit, electrifying the electric heating plate 12, and adjusting the voltage regulator 5 to ensure that the heat consumption of the electric heating plate 12 is U=240W; the temperature value transmitted to the computer by the data acquisition instrument 6 is observed, the temperature of the heat source and the jet time length of the gas-liquid two-phase flow are monitored, and the measured time curve is shown in figure 3. From the timing of starting the electric heating of the simulated heat source to 140s, the temperature of the heat source rises to 63 ℃, the pressure of the liquid storage chamber increases to 67.3kPa from 61kPa, the constant pressure one-way valve 10 is conducted, the gas-liquid two-phase flow starts to spray, the spraying duration is 820s, 10s longer than the design value, the deviation is 1.2%, the temperature of the heat source is 63 ℃ at the highest, exceeds the design index of 3 ℃, but the duration is very short, and after stable operation, the temperature of the heat source fluctuates back and forth within the range of 55-57 ℃ to meet the design index requirement.
In order to verify the parametric research test effect of the test system on the tested device, the internal reaction ambient pressure is set to 61KPa, the outlet ambient pressure is set to 10KPa, and the conduction pressure of the constant pressure check valve 10 is set to Δp=p in -P O =51kpa, ethanol mass flow rate of about 0.02kg/min, heating with 240W simulated heat source, and monitoring heat source temperature change curve after steady operationThe line is shown in fig. 4, and it can be seen from the graph that the heat source temperature fluctuates between 55 ℃ and 58 ℃ and is less than and close to the design temperature of 60 ℃ so as to meet the design requirements.
The invention has simple equipment, low cost, various local functions of the whole system, compact structure, convenient assembly and disassembly, repeatable multi-parameter research and construction in common scientific research places; the test system has obvious test effect, meets the test requirement of practical engineering application, has strong controllability and universality, and improves the efficiency of the micro-channel gas-liquid two-phase flow heat dissipation device test and parameter research.
In summary, the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The low-pressure micro-channel gas-liquid two-phase flow heat dissipation test system is characterized by comprising a micro-channel gas-liquid two-phase flow heat dissipation device (1), an internal reaction environment simulation part arranged at the inlet of the micro-channel gas-liquid two-phase flow heat dissipation device (1), and an outlet environment simulation part arranged at the outlet; the whole test system forms a closed flow channel;
the micro-channel gas-liquid two-phase flow heat dissipation device (1) is used as a tested piece, and the internal reaction environment simulation part comprises a second pressure gauge (7-2), a third ball valve (9-3), a second transparent fluorine-filled pipe (8-2), a second ball valve (9-2), a first large-volume airtight vacuum tank (3-1) provided with a first pressure gauge (7-1), a first ball valve (9-1), a first transparent fluorine-filled pipe (8-1) and a first vacuum pump (2-1), wherein the inlets of the second pressure gauge, the third ball valve, the second transparent fluorine-filled pipe (8-2) and the second ball valve (9-2) are sequentially connected forwards; the outlet environment simulation part comprises a constant-pressure one-way valve (10), a third transparent fluorine-filled pipe (8-3), a fourth ball valve (9-4), a pressure stabilizing tank (4), a fifth ball valve (9-5), a fourth transparent fluorine-filled pipe (8-4), a sixth ball valve (9-6), a second large-volume airtight vacuum tank (3-2) provided with a third pressure gauge (7-3), a seventh ball valve (9-7), a fifth transparent fluorine-filled pipe (8-5) and a second vacuum pump (2-2), which are sequentially connected at the outlet;
an electric heating sheet (12) and a temperature sensor (13) are arranged on a bottom runner flat plate of the microchannel gas-liquid two-phase flow heat dissipation device (1); the electric heating sheet (12) is connected with the voltage regulator (5) through an electric wire and then connected to a 220V power supply; the temperature sensor (13) is connected to the data acquisition instrument (6) through a data line and then transmitted to the computer software through a network line.
2. The low-pressure micro-channel gas-liquid two-phase flow heat dissipation test system according to claim 1, wherein the diameters of the first to fifth transparent fluorine-filled tubes (8-1, 8-2, 8-3, 8-4, 8-5) and the first to seventh ball valves (9-1, 9-2, 9-3, 9-4, 9-5, 9-6, 9-7) are equal and are all 5mm.
3. The low-pressure micro-channel gas-liquid two-phase flow heat dissipation test system according to claim 1, wherein the pressure stabilizing tank (4) is internally filled with an absorption liquid which is compatible with a working medium, the working medium absorbs heat and changes phase and is discharged to the pressure stabilizing tank (4) to be contacted with the absorption liquid and dissolved and absorbed, the outlet environment pressure is stabilized, and the outlet two-phase flow working medium is isolated from a charged instrument and the outside environment.
4. The low-pressure microchannel gas-liquid two-phase flow heat dissipation test system according to claim 1, wherein the microchannel gas-liquid two-phase flow heat dissipation device (1) is fixed on a tool support (11).
5. A low-pressure micro-channel gas-liquid two-phase flow heat dissipation test method is characterized by comprising the following steps:
step 1, a second pressure gauge (7-2) is connected to an inlet of a micro-channel gas-liquid two-phase flow heat radiating device (1), the second pressure gauge (9-2) is connected through a third ball valve (9-3) and a second transparent fluorine filling pipe (8-2), the second ball valve (9-2) is arranged at an outlet end of a first large-volume airtight vacuum tank (3-1) provided with a first pressure gauge (7-1), the first ball valve (9-1) is arranged at an inlet end, and finally the first vacuum pump (2-1) is connected through the first transparent fluorine filling pipe (8-1);
step 2, a constant-pressure one-way valve (10) is firstly connected to the outlet of the micro-channel gas-liquid two-phase flow heat radiating device (1), the opening and closing of the outlet of the device are controlled, then a fourth ball valve (9-4) is connected through a third transparent fluorine filling pipe (8-3), the fourth ball valve (9-4) is arranged at the inlet end of a pressure stabilizing tank (4), a fifth ball valve (9-5) is arranged at the outlet end of the pressure stabilizing tank (4), then a sixth ball valve (9-6) is connected through the fourth transparent fluorine filling pipe (8-4), the sixth ball valve (9-6) is arranged at the inlet end of a second large-volume airtight vacuum tank (3-2) provided with a third pressure gauge (7-3), a seventh ball valve (9-7) is arranged at the outlet end, and finally the second vacuum pump (2-2) is connected through the fifth transparent fluorine filling pipe (8-5);
step 3, sticking an electric heating plate (12) on a bottom runner flat plate of the micro-channel gas-liquid two-phase flow heat dissipation device (1) through heat conduction silicone grease, wherein the electric heating plate (12) is connected with a voltage regulator (5) through an electric wire and then connected to a 220V power supply; a temperature sensor (13) is arranged on a bottom runner flat plate of the micro-channel gas-liquid two-phase flow heat dissipation device (1) by using a high-temperature adhesive tape, the temperature sensor (13) is connected to a data acquisition instrument (6) through a data line, and then is transmitted to computer software through a network line; finally, fixing the micro-channel gas-liquid two-phase flow heat dissipation device (1) on the tool support (11);
and 4, after the test system is built, switching between two functional modes according to the requirement, wherein the two functional modes comprise an actual working environment simulation mode of the micro-channel gas-liquid two-phase flow heat dissipation device (1) and a parameterization research mode of the micro-channel gas-liquid two-phase flow heat dissipation device (1).
6. The low-pressure micro-channel gas-liquid two-phase flow heat dissipation test method according to claim 5, wherein the actual working environment simulation mode of the micro-channel gas-liquid two-phase flow heat dissipation device (1) is as follows:
after the pressure of the reaction environment in the tested piece, namely the micro-channel gas-liquid two-phase flow heat dissipation device (1), is regulated to a value required by a test, a third ball valve (9-3) at the inlet is closed; the outlet of the micro-channel gas-liquid two-phase flow heat dissipation device (1) is communicated with the pressure stabilizing tank (4) and the second large-volume airtight vacuum tank (3-2), and after the internal pressure is regulated to a value required by a test, the ambient pressure of the outlet of the micro-channel gas-liquid two-phase flow heat dissipation device (1) is simulated; regulating the voltage of the voltage regulator (5) and controlling the heat consumption of the electric heating sheet (12); and (3) observing the temperature value transmitted to a computer by the data acquisition instrument (6), and monitoring the temperature of the heat source and the jet time of the gas-liquid two-phase flow.
7. The low-pressure microchannel gas-liquid two-phase flow heat dissipation test method according to claim 5, wherein the parameterized research mode of the microchannel gas-liquid two-phase flow heat dissipation device (1) is as follows:
after the internal reaction environment pressure of a tested piece, namely the micro-channel gas-liquid two-phase flow heat dissipation device (1), is adjusted to a value required by a test, an inlet pressure parameter is controlled by communicating a first large-volume airtight vacuum tank (3-1), after the outlet pressure of the micro-channel gas-liquid two-phase flow heat dissipation device (1) is adjusted to a value required by the test, an outlet pressure parameter is controlled by communicating a pressure stabilizing tank (4) and a second large-volume airtight vacuum tank (3-2), the voltage of a voltage regulator (5) is adjusted, and the heat consumption of an electric heating sheet (12) is controlled; and (3) observing the temperature value transmitted to the computer by the data acquisition instrument (6) and monitoring the temperature change of the heat source.
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| CN113092145B (en) * | 2021-02-26 | 2022-07-29 | 北京空间飞行器总体设计部 | Lunar surface working medium emission equivalent test device and method |
| CN113281378B (en) * | 2021-05-25 | 2023-03-24 | 华中科技大学 | Decoupling research device for end heat transfer of metallized film capacitor |
| CN113190101B (en) * | 2021-06-09 | 2022-05-10 | 楚岳(惠州)热传科技有限公司 | Circulating two-phase flow industrial computer radiator |
| CN113970944B (en) * | 2021-10-15 | 2022-04-29 | 中国科学院力学研究所 | Environmental pressure and density control system and method for small-particle high-speed water entering experiment |
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