CN112665817A - Variable-pitch capillary core micro-channel flow resistance measuring device - Google Patents
Variable-pitch capillary core micro-channel flow resistance measuring device Download PDFInfo
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- CN112665817A CN112665817A CN202011478714.5A CN202011478714A CN112665817A CN 112665817 A CN112665817 A CN 112665817A CN 202011478714 A CN202011478714 A CN 202011478714A CN 112665817 A CN112665817 A CN 112665817A
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Abstract
The invention discloses a variable-pitch capillary core micro-channel flow resistance measuring device, relates to a capillary core micro-channel flow resistance measuring device, and belongs to the technical field of aerodynamic measurement. The variable-pitch capillary wick micro-channel flow resistance measuring device is simple, safe and reliable, and can measure the flow resistance characteristics of different liquid absorbing cores (channels, sintered particles and silk screens) under the condition that the back pressure of the micro-channel (the height of the channel is less than or equal to 1 mm) is negative pressure. Include the flow control valve 1, gas flowmeter 2, capillary core microchannel experimental apparatus, backpressure governing valve 10, vacuum tank 11, vacuum pump 12 that connect gradually through metal collapsible tube, capillary core microchannel experimental apparatus includes infrabasal plate, the accurate gasket of metal, sealing washer, upper cover plate, capillary core, a pair of pressure gauge and a pair of rectifier tube. The flow resistance characteristics of different capillary cores (channels, sintered particles and silk screens) under a micro-channel (channel height = 0.2-1 mm) and under a back pressure of negative pressure can be measured.
Description
Technical Field
The invention relates to a capillary core microchannel flow resistance measuring device, and belongs to the technical field of aerodynamic measurement.
Background
Due to the rapid development of the electronic industry technology, electronic components gradually develop towards miniaturization, high integration and high performance, the heat flow density of the electronic components in the operation process is higher and higher, effective heat dissipation becomes more difficult, and the heat dissipation problem gradually becomes a bottleneck problem restricting the development of high-integration electronic components. The heat pipe can effectively solve the problem of high-efficiency heat dissipation, and consists of three basic parts, namely a shell, a working medium and a capillary core, the working principle is that one end of the heat pipe is contacted with a hot fluid, a working medium in the pipe is heated and evaporated to be steam, the corresponding saturated steam pressure in the pipe is correspondingly improved, the steam flows to a condensing section at the other end through a middle transmission section by virtue of small pressure difference in space, the working medium emits heat to a cold fluid in the condensing section to condense the steam in the pipe into liquid, and then the condensed liquid working medium flows back to the evaporation section through the capillary action of the capillary core. At present, 0.2mm ultrathin flat heat pipes are applied to the digital electronic market, although the mechanism of the cylindrical heat pipe is mature, the research on the flow characteristic inside the ultrathin flat heat pipe is less, and the research on the flow resistance characteristic of a capillary core micro-channel is lacked at home and abroad.
The designed simple and reliable device can realize the measurement of the flow resistance of different liquid absorbing cores (channels, sintered particles and silk screens) under the negative pressure environment and the micro-channel (the height of the channel is less than or equal to 1 mm) under the condition that the back pressure is the negative pressure, and has important value.
Disclosure of Invention
Aiming at the problems, the invention provides the variable-pitch capillary wick microchannel flow resistance measuring device which is simple, safe and reliable, and can measure the flow resistance characteristics of different liquid suction cores (channels, sintered particles and silk screens) under the condition that the height of the microchannel is less than or equal to 1mm and the back pressure is negative pressure.
The technical scheme of the invention is as follows: comprises a flow regulating valve 1, a gas flowmeter 2, a capillary wick micro-channel experimental device, a back pressure regulating valve 10, a vacuum tank 11 and a vacuum pump 12 which are connected in sequence through a metal hose,
the capillary core microchannel experimental device comprises a lower substrate 4, a metal precision gasket 5, a sealing ring 6, an upper cover plate 7, a capillary core 8, a pair of pressure gauges 9 and a pair of rectifying tubes 3; the upper cover plate 7, the sealing ring 6 and the lower substrate 4 are sequentially arranged from top to bottom, so that an experimental flow channel is formed among the upper cover plate, the sealing ring 6 and the lower substrate, and the sealing ring is made of silica gel; the upper cover plate 7 and the lower base plate 4 are detachably connected, the sealing ring 6 is pressed through the upper cover plate and the lower base plate, and the metal precision gasket 5 is abutted between the upper cover plate 7 and the lower base plate 4;
the pair of rectifier tubes 3 are fixedly connected with the lower base plate 4 and communicated with an experimental flow channel, and the two rectifier tubes 3 are respectively connected with a gas flowmeter 2 and a backpressure regulating valve 10; a pair of pressure gauges 9 are fixedly connected with the lower substrate 4 and extend into the experimental flow channel, and the pair of pressure gauges 9 are positioned between the pair of rectifier tubes 3; the capillary wick 8 is sintered on the top surface of the lower substrate 4 by hot pressing and is located between the pair of pressure gauges 9, and the pressure value of the fluid before and after passing through the capillary wick 8 is measured by the pair of pressure gauges 9.
The lower substrate 4 and the pair of rectifying tubes 3 are welded together by argon arc welding.
The top surface of the lower substrate 4 is provided with a lower annular groove, the bottom surface of the upper cover plate 7 is provided with an upper annular groove opposite to the lower annular groove, and the sealing ring 6 is positioned between the upper annular groove and the lower annular groove.
A plurality of through-holes have all been seted up around upper cover plate 7 and infrabasal plate 4, wear to be equipped with the bolt in the through-hole, be equipped with on the bolt with its threaded connection's nut, compress tightly upper cover plate 7, metal precision gasket 5, infrabasal plate 4 through a plurality of bolts and nuts to make and keep sealed between sealing washer 6 and upper cover plate 7 and the infrabasal plate 4.
The metal precision gasket 5 has multiple specifications, wherein the thickness of the metal precision gasket 5 with the smallest thickness is 0.2mm, the thickness of the metal precision gasket 5 with the largest thickness is 1mm, and the height of the capillary core 8 is 0.1 mm.
The pair of pressure gauges 9 are arranged at the front section and the rear section of the experimental flow channel sintered with the capillary cores, are connected with the lower substrate 4 through threads, and obtain the fluid flow resistance of the capillary core micro-channel according to the pressure data of the pressure gauges.
The vacuum tank 11 is connected with the capillary core micro-channel experimental section and the vacuum pump 12 through a metal hose, and the vacuum tank and the vacuum pump are used for maintaining the stability of back pressure.
Compared with the prior art, the device provided by the invention is simple, safe and reliable, and can be used for measuring the flow resistance characteristics of different capillary cores (channels, sintered particles and silk screens) under a microchannel (with the channel height = 0.2-1 mm) and under the condition that the back pressure is negative pressure.
Drawings
FIG. 1 is a schematic structural diagram of the present application,
FIG. 2 is a schematic structural view of the capillary core microchannel experimental apparatus in the present case;
in the figure, 1 is a flow regulating valve, 2 is a gas flowmeter, 3 is a rectifier tube, 4 is a lower substrate, 5 is a metal precision gasket, 6 is a sealing ring, 7 is an upper cover plate, 8 is a capillary core, 9 is a pressure gauge, 10 is a back pressure regulating valve, 11 is a vacuum tank, and 12 is a vacuum pump.
Detailed Description
In order to clearly explain the technical features of the present patent, the following detailed description of the present patent is provided in conjunction with the accompanying drawings.
The invention is shown in figure 1-2, comprises a flow regulating valve 1, a gas flowmeter 2, a capillary wick micro-channel experimental device, a back pressure regulating valve 10, a vacuum tank 11 and a vacuum pump 12 which are connected in sequence through a metal hose,
the capillary core microchannel experimental device comprises a lower substrate 4, a metal precision gasket 5, a sealing ring 6, an upper cover plate 7, a capillary core 8, a pair of pressure gauges 9 and a pair of rectifying tubes 3; the upper cover plate 7, the sealing ring 6 and the lower substrate 4 are sequentially arranged from top to bottom, so that an experimental flow channel is formed among the upper cover plate, the sealing ring 6 and the lower substrate, and the sealing ring is made of silica gel; the upper cover plate 7 and the lower base plate 4 are detachably connected, the sealing ring 6 is pressed through the upper cover plate and the lower base plate, and the metal precision gasket 5 is abutted between the upper cover plate 7 and the lower base plate 4, so that the height of the experimental flow channel is adjusted by replacing the metal precision gaskets 5 with different thicknesses and the sealing ring 6;
the pair of rectifier tubes 3 are fixedly connected with the lower base plate 4 in a welding mode and are communicated with an experimental flow channel, and the two rectifier tubes 3 are respectively connected with a gas flowmeter 2 and a backpressure regulating valve 10; the pair of pressure gauges 9 are fixedly connected with the lower base plate 4 through threads and extend into the experimental flow channel, and the pair of pressure gauges 9 are positioned between the pair of rectifier tubes 3; the capillary wick 8 is sintered on the top surface of the lower substrate 4 by hot pressing and is located between the pair of pressure gauges 9, and the pressure value of the fluid before and after passing through the capillary wick 8 is measured by the pair of pressure gauges 9.
The flow channel in the capillary core micro-channel experimental device is in a negative pressure environment, a vacuum tank 11 and a vacuum pump 12 maintain stable negative pressure, the vacuum degree in the flow channel is adjusted through a back pressure adjusting valve and a flow adjusting valve, and a metal hose is used to prevent deformation due to the negative pressure environment. And a pressure gauge is arranged in the capillary core microchannel experimental device, and the flow resistance of the fluid in the capillary core microchannel is obtained through the difference value of pressure data in the capillary core microchannel experimental device. The capillary core 8 is sintered on the lower substrate 4 through hot pressing, and for the reliability of sintering, a layer of 200-mesh red copper wire mesh is adopted for the capillary core 8, and the height of the capillary core is 0.1 mm.
Be equipped with flow control valve 1, back pressure governing valve 10 on metal collapsible tube, flow control valve 1 establish and keep away from capillary core microchannel experimental apparatus's one side at gas flowmeter 2, back pressure governing valve 10 is established between capillary core microchannel experimental apparatus and vacuum tank 11.
The lower substrate 4 and the pair of rectifying tubes 3 are welded together by argon arc welding or other means. To prevent the welding problem, the material of the rectifying tube is consistent with that of the lower substrate, and aluminum alloy 6061-T6 is used.
The top surface of the lower substrate 4 is provided with a lower annular groove, the bottom surface of the upper cover plate 7 is provided with an upper annular groove opposite to the lower annular groove, and the sealing ring 6 is positioned between the upper annular groove and the lower annular groove. So that the upper cover plate 7, the sealing ring 6 and the lower substrate 4 can be sealed efficiently.
A plurality of through-holes have all been seted up around upper cover plate 7 and infrabasal plate 4, wear to be equipped with the bolt in the through-hole, be equipped with on the bolt with its threaded connection's nut, compress tightly upper cover plate 7, metal precision gasket 5, infrabasal plate 4 through a plurality of bolts and nuts to make and keep sealed between sealing washer 6 and upper cover plate 7 and the infrabasal plate 4.
The metal precision gasket 5 has multiple specifications, wherein the thickness of the metal precision gasket 5 with the smallest thickness is 0.2mm, the thickness of the metal precision gasket 5 with the largest thickness is 1mm, the thickness difference of each metal precision gasket 5 is 0.1mm, and the height of the capillary core 8 is 0.1 mm. The upper cover plate is made of aluminum alloy 6061-T6, and the flatness requirement of the upper cover plate and the lower base plate is 0.01 mm.
The pair of pressure gauges 9 are arranged at the front section and the rear section of the experimental flow channel sintered with the capillary cores, are connected with the lower substrate 4 through threads, and obtain the fluid flow resistance of the capillary core micro-channel according to the pressure data of the pressure gauges. In order to prevent the hole of the pressure gauge from being too large to affect the measurement of the flow resistance, a conical punching mode is adopted as shown in fig. 2, and the error is reduced.
The vacuum tank 11 is connected with the capillary core micro-channel experimental section and the vacuum pump 12 through a metal hose, and the vacuum tank and the vacuum pump are used for maintaining the stability of back pressure.
The working process of the device of the invention is as follows:
the air is used as a working medium, the upper cover plate 7, the lower base plate 4 and the silica gel sealing ring 6 are assembled together, a metal precision gasket 5 (with the tolerance of +/-0.004 mm) with the specified height (the thickness of 0.2mm is taken for the first time) is placed between the upper cover plate 7 and the lower base plate 4, and the bolt and the nut are fastened to penetrate through the upper cover plate and the lower base plate and are pressed until the metal gasket 5 cannot move.
And then the metal hose is sequentially connected with a flow regulating valve 1, a gas flowmeter 2, a capillary core micro-channel experimental device, a backpressure regulating valve 10, a vacuum tank 11 and a vacuum pump 12.
Closing the flow regulating valve 1, opening the backpressure regulating valve 10, opening the vacuum pump to vacuumize the capillary core microchannel experimental device until the vacuum degree is maintained at 10-3And when Pa is needed, closing the backpressure regulating valve 10 and testing the tightness of the capillary wick microchannel experimental device.
After the capillary wick microchannel experimental device has good sealing performance, the back pressure regulating valve 10 and the flow regulating valve 1 are opened, the flow regulating valve 1 and the back pressure regulating valve 10 are regulated, data of the pressure gauge 9 under different flow rates are recorded, and the flow resistance characteristic of the capillary wick microchannel can be obtained by arranging and calculating the data.
And replacing the metal precision gaskets 5 with different heights or the lower substrates of different capillary cores 8, and repeating the operation to obtain the characteristics of the micro-channel flow resistance of different flow channel heights and different capillary core structures under the condition that the back pressure is negative pressure.
While the invention has been described in terms of its preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (7)
1. A variable-pitch capillary wick micro-channel flow resistance measuring device is characterized by comprising a flow regulating valve (1), a gas flowmeter (2), a capillary wick micro-channel experimental device, a back pressure regulating valve (10), a vacuum tank (11) and a vacuum pump (12) which are sequentially connected through a metal hose,
the capillary core microchannel experimental device comprises a lower substrate (4), a metal precision gasket (5), a sealing ring (6), an upper cover plate (7), a capillary core (8), a pair of pressure gauges (9) and a pair of rectifier tubes (3); the upper cover plate (7), the sealing ring (6) and the lower base plate (4) are sequentially arranged from top to bottom, so that an experimental flow channel is formed among the upper cover plate, the sealing ring (6) and the lower base plate, and the sealing ring (6) is made of silica gel; the upper cover plate (7) and the lower base plate (4) are detachably connected, the sealing ring (6) is pressed through the upper cover plate and the lower base plate, and the metal precision gasket (5) is abutted between the upper cover plate (7) and the lower base plate (4);
the pair of rectifying tubes (3) are fixedly connected with the lower base plate (4) and communicated with an experimental flow channel, and the two rectifying tubes (3) are respectively connected with a gas flowmeter (2) and a backpressure regulating valve (10); the pair of pressure gauges (9) are fixedly connected with the lower base plate (4) and extend into the experimental flow channel, and the pair of pressure gauges (9) are positioned between the pair of rectifier tubes (3); the capillary core (8) is sintered on the top surface of the lower substrate (4) through hot pressing and is positioned between the pair of pressure gauges (9), and the air pressure value of the fluid before and after passing through the capillary core (8) is measured through the pair of pressure gauges (9).
2. The device for measuring the flow resistance of the capillary wick microchannel with variable distance according to claim 1, wherein the lower substrate (4) and the pair of rectifying tubes (3) are welded together by argon arc welding.
3. The device for measuring the flow resistance of the variable-pitch capillary wick microchannel according to claim 1, wherein the lower annular groove is formed on the top surface of the lower substrate (4), the upper annular groove is formed on the bottom surface of the upper cover plate (7) and is opposite to the lower annular groove, and the sealing ring (6) is positioned between the upper annular groove and the lower annular groove.
4. The device for measuring the flow resistance of the variable-pitch capillary core microchannel as claimed in claim 4, wherein a plurality of through holes are formed around the upper cover plate (7) and the lower base plate (4), bolts are inserted into the through holes, nuts in threaded connection with the bolts are arranged on the bolts, the upper cover plate (7), the metal precision gasket (5) and the lower base plate (4) are pressed tightly by the bolts and the nuts, and the sealing ring (6) is kept sealed with the upper cover plate (7) and the lower base plate (4).
5. The variable-pitch capillary wick microchannel flow resistance measuring device according to claim 1, wherein the metal precision gasket (5) has a plurality of specifications, wherein the thickness of the metal precision gasket (5) with the smallest thickness is 0.2mm, the thickness of the metal precision gasket (5) with the largest thickness is 1mm, and the height of the capillary wick (8) is 0.1 mm.
6. The device for measuring the flow resistance of the capillary wick microchannel with the variable distance according to claim 1, wherein a pair of pressure gauges (9) are arranged at the front section and the rear section of the experimental flow channel sintered with the capillary wick, and are connected with the lower substrate (4) through screw threads, so that the fluid flow resistance of the capillary wick microchannel can be obtained according to the pressure data of the pressure gauges.
7. The device for measuring the flow resistance of the capillary wick microchannel with variable distance according to claim 1, wherein the vacuum tank (11) is connected with the capillary wick microchannel experimental section and the vacuum pump (12) through a metal hose, and the vacuum tank and the vacuum pump are used together to maintain the stability of the back pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011478714.5A CN112665817A (en) | 2020-12-15 | 2020-12-15 | Variable-pitch capillary core micro-channel flow resistance measuring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011478714.5A CN112665817A (en) | 2020-12-15 | 2020-12-15 | Variable-pitch capillary core micro-channel flow resistance measuring device |
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| CN112665817A true CN112665817A (en) | 2021-04-16 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104697739A (en) * | 2015-03-16 | 2015-06-10 | 上海交通大学 | Flow resistance and temperature distribution testing device for low-temperature fluid inside heat insulating corrugated pipes |
| CN107764117A (en) * | 2017-10-27 | 2018-03-06 | 南京航空航天大学 | A kind of liquid-sucking core support column integrative-structure flat-plate heat pipe based on carbon nano pipe array |
| CN109443060A (en) * | 2018-09-25 | 2019-03-08 | 广东工业大学 | A kind of ultra-thin panel heat pipe and its manufacturing process |
| CN110425918A (en) * | 2019-07-24 | 2019-11-08 | 南京航空航天大学 | A kind of ultrathin flexible flat-plate heat pipe |
-
2020
- 2020-12-15 CN CN202011478714.5A patent/CN112665817A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104697739A (en) * | 2015-03-16 | 2015-06-10 | 上海交通大学 | Flow resistance and temperature distribution testing device for low-temperature fluid inside heat insulating corrugated pipes |
| CN107764117A (en) * | 2017-10-27 | 2018-03-06 | 南京航空航天大学 | A kind of liquid-sucking core support column integrative-structure flat-plate heat pipe based on carbon nano pipe array |
| CN109443060A (en) * | 2018-09-25 | 2019-03-08 | 广东工业大学 | A kind of ultra-thin panel heat pipe and its manufacturing process |
| CN110425918A (en) * | 2019-07-24 | 2019-11-08 | 南京航空航天大学 | A kind of ultrathin flexible flat-plate heat pipe |
Non-Patent Citations (1)
| Title |
|---|
| 曲芳仪: "基于镍基毛细芯改性的氨低温环路热管传热特性研究", 《中国优秀博硕士学位论文全文数据库（硕士）》 * |
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Application publication date: 20210416 |
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