CN210464154U - Pulsating heat pipe based on liquid metal mixed working medium - Google Patents

Pulsating heat pipe based on liquid metal mixed working medium Download PDF

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Publication number
CN210464154U
CN210464154U CN201921355206.0U CN201921355206U CN210464154U CN 210464154 U CN210464154 U CN 210464154U CN 201921355206 U CN201921355206 U CN 201921355206U CN 210464154 U CN210464154 U CN 210464154U
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liquid metal
working medium
heat pipe
micro
mixed working
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CN201921355206.0U
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纪玉龙
庾春荣
褚李林
肖秀
马鸿斌
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Dalian Maritime University
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Dalian Maritime University
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Abstract

The utility model provides a pulsation heat pipe based on liquid metal mixed working medium, fill liquid mouth and integrated heating section, adiabatic section, condensation segment's capillary passageway array including the tee bend, the tee bend fills the opening on two horizontal directions of liquid mouth and is connected with two ports of capillary passageway array, the internal surface of capillary passageway array has the micro-structure surface that obtains by surface modification technology processing, working medium in the capillary passageway array is the mixed working medium of mainly forming by liquid metal and with the compatible fluid of liquid metal, compatible fluid forms vapour pad and vortex on the micro-structure surface. The evaporation rate of the thin film formed on the surface of the microstructure of the utility model can be obviously enhanced; the liquid metal has high-efficiency heat conduction characteristic, and can obviously improve the heat absorption and release speed of the working medium; compatible fluid forms a steam cushion and a vortex on the surface of the microstructure, so that the flow resistance of the working medium is effectively reduced, the flow speed is increased, and the convection heat transfer is enhanced. The utility model has the advantages of novel structure, high heat transfer coefficient and the like.

Description

Pulsating heat pipe based on liquid metal mixed working medium
Technical Field
Pulsating heat pipe based on liquid metal mixed working medium relates to a heat transfer component, specifically is the pulsating heat pipe based on liquid metal mixed working medium who comprises the pulsating heat pipe that has the micro-structure surface and inside liquid metal and compatible fluid working medium.
Background
Innovations in modern high and new technologies and applications have focused on micro-nano dimensions, such as very large scale integrated circuits and chips, high power lasers, and micro-energy systems. Microelectronic systems and devices are becoming faster and smaller, resulting in a sharp increase in local heat production. The conventional method for improving the heat dissipation efficiency has almost reached the limit, and the lack of a new effective heat dissipation method has become one of the major bottlenecks restricting the development of new technologies. Therefore, it is very urgent and necessary to develop a high-efficiency heat dissipation technology under high heat flux density. The pulsating heat pipe as a special member of a heat pipe family has a completely different working mechanism from that of a common heat pipe, has a plurality of unique advantages, and becomes one of the most promising technical solutions for the heat dissipation problem under high heat flow density in the future.
Research shows that the pulsating heat pipe mainly transfers heat by sensible heat, which means that if the heat transfer performance of the pulsating heat pipe is greatly improved, the heat transfer performance of the pulsating heat pipe is mainly improved by the pulsating speed, and the heat resistance of the pulsating heat pipe is also greatly reduced along with the increase of heating power. However, as the pulsation speed increases, the following key problems must be faced: (1) if the heat conduction capability of the liquid column is poor, the liquid column returns to the heating section after the heat release end has no time to release heat or releases little heat, the heat transfer performance cannot be improved, and even the liquid column stops working; (2) after the pulsation speed is increased, the flow resistance in the pipe is increased, so that the required driving force is increased, namely the temperature of the heat absorption end is obviously increased, and the heat transfer performance is deteriorated; (3) when the pulse speed is increased, the evaporation speed of the heat absorption end is fast enough, namely the heat flow density is high, so as to meet the requirement of fast driving. As is known, liquid metal has a higher thermal conductivity coefficient which is 1 or even 2 orders of magnitude higher than that of common liquid, for example, the thermal conductivity coefficient of water is about 0.65W/mK, and the gallium indium tin liquid alloy can reach about 40W/mK. In order to solve the problems, the heat transfer performance of the pulsating heat pipe is greatly improved, and the heat transfer problem under high heat flow density is effectively solved, so that the invention provides the pulsating heat pipe based on the liquid metal mixed working medium, provides a new thought and a high-efficiency scheme for solving the rapid heat transfer problem under high heat flow density, and simultaneously develops a new direction for the research of the high-efficiency pulsating heat pipe.
SUMMERY OF THE UTILITY MODEL
According to the technical problem that the pulsating heat pipe is difficult to rapidly transfer heat under high heat flow density in the prior art, the pulsating heat pipe based on the liquid metal mixed working medium is provided. The utility model mainly utilizes the micro-structure surface made in the pulsating heat pipe, and is compatible with the evaporation of fluid working medium on the thin film on the micro-structure surface, thereby greatly improving the heat flux density and obviously enhancing the evaporation speed of the heat absorption end; the heat absorption and release speed can be obviously improved by utilizing the characteristic of high-efficiency heat conduction of the liquid metal; the compatible fluid is utilized to form a steam cushion and a vortex on the surface of the microstructure, so that the flow resistance of the working medium is effectively reduced, the flow speed is increased, and the convection heat transfer is enhanced; the efficient heat transfer capability of the pulsating heat pipe under high heat flow density is improved by organically combining the efficient heat conduction of liquid metal, the enhanced convection heat transfer of rapid pulsating flow under the resistance reduction of the steam cushion, the enhanced heat exchange of local eddy and the rapid phase change heat transfer of thin film evaporation.
The utility model discloses a technical means as follows:
a pulsating heat pipe based on liquid metal mixed working media comprises a tee joint liquid filling port and a capillary channel array integrating a heating section, a heat insulation section and a condensation section, wherein two horizontal through ports of the tee joint liquid filling port are connected with two ports of the capillary channel array, the inner surface of the capillary channel array is provided with a microstructure surface obtained by surface modification technology processing, and the working media in the capillary channel array are mixed working media mainly composed of liquid metal and compatible fluids compatible with the liquid metal.
Further, under heat absorbing conditions, the compatible fluid forms a vapor cushion and a vortex on the microstructure surface; in the working process, compatible fluid in the microstructure surface of the heating section is evaporated under the condition of heat absorption, a thin steam cushion is formed between the liquid metal and the microstructure surface, a local vortex is formed along with the flow of the liquid column, and a local vortex is also formed along with the flow of the liquid column in the microstructure surface of the condensing section; the liquid metal can be driven to pulsate in the pulsating heat pipe by compatible evaporation of heated fluid, and the heat absorption and release capacity of the working medium of the pulsating heat pipe at high heat flow density can be improved by combining the high heat conduction characteristic of the liquid metal; the thin film formed on the surface of the microstructure by compatible fluid is evaporated, so that the heat flow density is greatly improved, and the evaporation speed of a heat absorption end is obviously enhanced; the liquid metal and the compatible fluid compatible with the liquid metal can effectively reduce the flow resistance of the liquid metal and the compatible fluid under the action of the steam cushion and the vortex, improve the flow speed and strengthen the convection heat transfer, can strengthen the heat transfer capability of the pulsating heat pipe working under the ultrahigh heat flow density, and simultaneously increase the working temperature range.
Further, the microstructure surface is a micro-nano structure I arranged in the circumferential direction of the inner surface of the capillary channel array.
Furthermore, the micro-structure surface is a composite structure of a micro-nano structure I arranged in the circumferential direction of the inner surface of the capillary channel array and a micro-nano structure II arranged along the channel direction.
Further, the micro-structure surface is a micro-nano structure obtained by a surface modification technology, and the micro-nano structure I and the micro-nano structure II are at least in one of a triangular groove shape, a sawtooth-shaped cross section, a rectangular shape, a trapezoidal shape or a semicircular shape, or in a combination form of more than one; the surface modification technology is mechanical processing, or chemical treatment, or electroplating, or laser etching, or plasma spraying.
Further, the volume liquid filling rate range of the working medium in the capillary channel array is 20% -80%.
Furthermore, the mixed liquid contains 10-90% of liquid metal and 10-90% of compatible fluid.
Further, the liquid metal is at least one of liquid mercury, gallium indium tin alloy, gallium indium alloy or indium bismuth alloy, or a combination of more than one of the liquid mercury, the gallium indium tin alloy, the gallium indium alloy and the indium bismuth alloy.
Further, the compatible fluid is water, or freon refrigerants, or alcohols, is compatible with the liquid metal 3, does not react, and has a lower boiling point than the liquid metal.
Compared with the prior art, the utility model has the advantages of it is following:
1. the utility model provides a pulsation heat pipe based on liquid metal mixing medium utilizes liquid metal and the compatible fluid of 3 compatible with liquid metal as the working medium based on the pulsation heat pipe of liquid metal mixing medium, and liquid metal has high-efficient heat conduction characteristic, and the heat will be at the quick heat absorption of heating section, and along with the quick pulsation flow of liquid column, the heat will be released fast at the condensation section to promote the heat absorption and release speed by a wide margin, have good heat transfer capacity under high heat flux density, and the coefficient of heat transfer is high.
2. The utility model provides a pulsation heat pipe based on liquid metal mixed working medium utilizes surface modification technique to obtain the micro-structure surface with pulsation heat pipe internal surface, and compatible fluid forms thin film rapid evaporation on the micro-structure surface, is showing the evaporation rate who has reinforceed the interior evaporating end working medium of pulsation heat pipe, has effectively strengthened the drive power of working medium pulsation, has solved the demand of working medium pulsation to drive power under the high heat flux density.
3. The utility model provides a pulsation heat pipe based on liquid metal mixed working medium, the compatible fluid of adoption forms vapour pad and vortex on the micro-structure surface, effectively reduces working medium flow resistance, promotes the velocity of flow and reinforces the convection heat transfer, strengthens the adaptability of pulsation heat pipe under high heat flux density, increases the temperature application range of pulsation heat pipe.
4. The utility model provides a pulsation heat pipe based on liquid metal mixed working medium has advantages such as novel structure, with low costs, the quality is light, workable, coefficient of heat transfer is high and application range is wide, and its big batch is put into market must produce positive social and the economic benefits who is showing.
To sum up, use the technical scheme of the utility model the problem that pulsation heat pipe is difficult to fast heat transfer under high heat flux density among the prior art can be solved.
Based on the reason, the utility model discloses can extensively promote in fields such as aviation, military project that use the pulsation heat pipe to conduct heat.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural diagram of a position a of the present invention.
Fig. 3 is a schematic structural diagram of the position B of the present invention.
Fig. 4 is a schematic structural diagram of the composite structure at the position B of the present invention.
In the figure: 1. a three-way liquid filling port; 2. an array of capillary channels; 3. a liquid metal; 4. a compatible fluid; 5. a microstructured surface; 6. steam cushion and vortex; 7. a micro-nano structure I; 8. and a micro-nano structure II.
Detailed Description
It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Example 1
As shown in fig. 1-4, the utility model provides a pulsating heat pipe based on liquid metal mixed working medium, fill liquid mouth 1 and integrated heating section, adiabatic section, condensation segment's capillary channel array 2 including the tee bend, the tee bend fills the opening on two horizontal directions of liquid mouth 1 and two port welding of capillary channel array 2 link to each other, capillary channel array 2's internal surface has the micro-structure surface 5 who obtains by the processing of surface modification technique, working medium in capillary channel array 2 is liquid metal 3 and the mixed liquid of compatible fluid 4 compatible with liquid metal 3, and wherein, liquid metal 3 and compatible fluid 4 are respectively intermittent fills through the tee bend and form as shown in fig. 1 shape in filling into the capillary channel array 2 that has micro-structure surface 5.
In the present embodiment, under the heat absorbing condition, the compatible fluid 4 forms a vapor cushion and a vortex 6 on the microstructure surface 5; in the working process, compatible fluid 4 in the microstructure surface 5 of the heating section is evaporated under the condition of heat absorption, a thin steam cushion is formed between the liquid metal 3 and the microstructure surface 5, a local vortex is formed along with the flow of a liquid column, and a local vortex is also generated along with the flow of the liquid column in the microstructure surface 5 of the condensing section; the compatible fluid 4 is heated and evaporated to drive the liquid metal 3 to pulsate in the pulsating heat pipe, and the heat absorption and release capacity of the working medium of the pulsating heat pipe at high heat flow density can be improved by combining the high heat conduction characteristic of the liquid metal 3; the thin film formed on the surface 5 of the microstructure by the compatible fluid 4 is evaporated, so that the heat flow density is greatly improved, and the evaporation speed of the heat absorption end is obviously enhanced; the liquid metal 3 and the compatible fluid 4 compatible with the liquid metal 3 can effectively reduce the flow resistance of the working medium of the liquid metal 3 and the compatible fluid 4 under the action of the steam cushion and the vortex 6, improve the flow speed and strengthen the convection heat transfer, can enhance the heat transfer capacity of the pulsating heat pipe working under the ultrahigh heat flow density, and simultaneously increase the working temperature range.
The micro-structure surface 5 of this embodiment is a semicircular micro-nano structure I7 which is obtained by adopting a machining surface modification technology and is arranged in the circumferential direction of the inner surface of the capillary channel array 2, the micro-structure surface 5 on the surface of the capillary channel array 2 shows different wettabilities to the liquid metal 3 and the compatible fluid 4, the compatible fluid 4 can form a thin film on the micro-structure surface 5, the thin film is evaporated to greatly improve the heat flux density, and the evaporation speed of the heat absorption end is obviously enhanced.
The volume liquid filling rate of the working medium in the capillary channel array 2 of the embodiment is 20%, wherein the working medium contains 10% of liquid metal 3 and 90% of compatible fluid 4.
The liquid metal 3 in the embodiment is liquid mercury which is liquid at normal temperature, has a high heat conductivity coefficient, and can remarkably improve the heat absorption and release speed of the working medium in the pulsating heat pipe; the compatible fluid 4 is water, compatible and non-reactive with the liquid metal 3, and has a lower boiling point than the liquid metal.
In conclusion, the pulsating heat pipe based on the liquid metal mixed working medium can realize rapid heat transfer under high heat flow density, and has higher heat transfer coefficient.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (9)

1. The utility model provides a pulsation heat pipe based on liquid metal mixed working medium, includes tee bend liquid filling mouth (1) and capillary channel array (2) of integrated heating section, adiabatic section, condensation segment, the opening on two horizontal directions of tee bend liquid filling mouth (1) is connected with two ports of capillary channel array (2), its characterized in that, the internal surface of capillary channel array (2) has microstructure surface (5) of obtaining by surface modification technology processing, the working medium in capillary channel array (2) is the mixed working medium of mainly by liquid metal (3) and with compatible fluid (4) constitution of liquid metal (3) compatibility.
2. A pulsating heat pipe based on liquid metal mixed working substance according to claim 1, characterized in that under heat absorbing conditions the compatible fluid (4) forms a vapor cushion and vortices (6) on the micro structured surface (5).
3. The pulsating heat pipe based on liquid metal mixed working medium according to claim 1, wherein the microstructure surface (5) is a micro-nano structure I (7) arranged in the circumferential direction of the inner surface of the capillary channel array (2).
4. The pulsating heat pipe based on liquid metal mixed working medium according to claim 1, wherein the microstructure surface (5) is a composite structure of a micro-nano structure I (7) arranged in the circumferential direction of the inner surface of the capillary channel array (2) and a micro-nano structure II (8) arranged along the channel direction.
5. The pulsating heat pipe based on liquid metal mixed working medium according to claim 3 or 4, wherein the micro-nano structure I (7) and the micro-nano structure II (8) are at least one of triangular groove shape, sawtooth-shaped cross section, rectangular shape, trapezoidal shape or semicircular shape, or a combination of more than one.
6. The pulsating heat pipe based on liquid metal mixed working medium as claimed in claim 1, wherein the volume liquid filling rate of the working medium in the capillary channel array (2) is in the range of 20% -80%.
7. A pulsating heat pipe based on liquid metal mixed working medium as in claim 6, wherein said working medium contains 10% -90% of liquid metal (3) and 10% -90% of compatible fluid (4).
8. The pulsating heat pipe based on liquid metal mixed working medium according to claim 1 or 7, wherein the liquid metal (3) is at least one of liquid mercury, gallium indium tin alloy, gallium indium alloy or indium bismuth alloy, or a combination of more than one of the liquid mercury, gallium indium tin alloy, gallium indium alloy or indium bismuth alloy.
9. The pulsating heat pipe based on liquid metal mixed working medium as claimed in claim 1 or 7, wherein said compatible fluid (4) is water, or freon refrigerants, or alcohols.
CN201921355206.0U 2019-08-20 2019-08-20 Pulsating heat pipe based on liquid metal mixed working medium Active CN210464154U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110470162A (en) * 2019-08-20 2019-11-19 大连海事大学 A kind of liquid metal steam cushion formula pulsating heat pipe

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110470162A (en) * 2019-08-20 2019-11-19 大连海事大学 A kind of liquid metal steam cushion formula pulsating heat pipe

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