A magnetic field controlled phase change system coupled with microchannel cooling system in microgravity environment

Abstract

The present invention discloses a magnetic field regulated phase change system coupled microchannel cooling system under a microgravity environment, comprising a magnetic field generator, a shell, a microchannel pipe network and a magnetic phase change material; the shell is used to fit with the target electronic device of thermal control, the microchannel pipe network is set as a honeycomb structure, and the magnetic phase change material is filled in the accommodating cavity formed by the honeycomb structure; the inlet and outlet of the microchannel pipe network are used to connect with the magnetic nanofluid to form a magnetic nanofluid circulation heat dissipation loop; the magnetic field generator controls the melting speed of the magnetic phase change material and controls the heat conduction speed of the phase change material, so that the magnetic field generator controls the flow speed of the magnetic nanofluid after the phase change material is melted and controls the speed of taking the heat of the phase change material out of the outside. The present invention has the beneficial effects of ingenious structural design, simple control, adjustable heat dissipation efficiency and stable and reliable.

Description

Technical Field

[0001] The invention relates to a cooling system, in particular to a magnetic field regulated phase change system coupled microchannel cooling system in a microgravity environment. Background Art

[0002] With the continuous development of aerospace technology and the application of space stations, spacecraft have put forward higher requirements and new challenges for efficient heat dissipation technology. The thermal control system is an important part of the spacecraft. It can absorb, transmit and dissipate heat to ensure that the temperature inside the spacecraft is at the required level, thereby ensuring that the spacecraft can work and operate more stably.

[0003] Therefore, it is necessary to design an adjustable and efficient heat dissipation system in the microgravity environment of space, which is extremely important for the stable operation of the spacecraft. Summary of the invention

[0004] The purpose of the present invention is to provide a magnetic field controlled phase change system coupled microchannel cooling system for use in a microgravity environment, which is simple to operate, has adjustable heat transfer efficiency, and is stable and reliable in order to solve the above problems.

[0005] The purpose of the present invention can be achieved by adopting the following technical solutions:

[0006] A magnetic field regulated phase change system coupled microchannel cooling system under a microgravity environment comprises a magnetic field generator, a shell, a microchannel pipe network and a magnetic phase change material; the shell is used to fit with a target electronic device for thermal control, the microchannel pipe network is set as a honeycomb structure, and the magnetic phase change material is filled in a containing cavity formed by the honeycomb structure; the inlet and outlet of the microchannel pipe network are used to connect with a magnetic nanofluid to form a magnetic nanofluid circulation heat dissipation loop; the magnetic field generator controls the melting speed of the magnetic phase change material and controls the heat conduction speed of the phase change material, so that the magnetic field generator controls the flow speed of the magnetic nanofluid after the phase change material is melted and controls the speed of taking the heat of the phase change material out of the outside.

[0007] As a preferred solution, the accommodating cavity is in the shape of a regular hexagon.

[0008] As a preferred solution, the inner wall of the microchannel network is provided with protrusions for enhancing fluid disturbance and velocity.

[0009] As a preferred solution, the protrusions are protrusion rings, and the protrusion rings are evenly arranged along the length direction of the microchannel tube.

[0010] As a preferred solution, the inner wall of the microchannel network is provided with a super-hydrophobic coating.

[0011] As a preferred solution, the magnetic field generator includes at least one pair of coils, each pair of coils is arranged on both sides of the shell; each pair of coils is parallel to each other and coaxially distributed; the currents flowing into the coils are in the same direction and equal in magnitude.

[0012] As a preferred solution, the distance between each pair of coils is equal to the radius of the coil.

[0013] As a preferred solution, the coil is a Helmholtz coil.

[0014] As a preferred solution, the magnetic phase change material is paraffin composite magnetic nanoparticles.

[0015] As a preferred solution, both ends of the microchannel network are sealed and connected to the shell, and the magnetic phase change material is sealed in the accommodating cavity.

[0016] The implementation of the present invention has the following beneficial effects:

[0017] 1. The present invention sets the microchannel pipe network as a honeycomb structure, fills the accommodating cavity inside the honeycomb structure with magnetic phase change material, and sets a magnetic nanofluid circulation heat dissipation loop in the honeycomb structure. When the direction of the magnetic field generated by the coil is opposite to the temperature gradient direction of the magnetic phase change material, the melting process of the magnetic phase change material can be strengthened, thereby improving the speed and efficiency of heat transfer; when the directions are the same, the magnetic field generated by the coil can inhibit the melting process of the magnetic phase change material, thereby reducing the speed and efficiency of heat transfer and reducing the loss of heat. At this time, the magnetic phase change material plays a role in heat preservation. At the same time, by controlling the size and direction of the magnetic field, the flow speed of the magnetic nanofluid after the phase change material is melted can be controlled, and the speed of taking the heat of the phase change material out of the outside world can be controlled, thereby increasing or reducing the speed and efficiency of heat transfer. It has the advantages of ingenious structural design, simple control, adjustable heat dissipation efficiency and stable and reliable.

[0018] 2. The microchannel network of the present invention is designed as a honeycomb structure, which greatly improves the thermal conductivity and thus enhances the heat transfer efficiency of transferring the heat of the phase change material to the outside. Therefore, the honeycomb structure has a complex hexagonal microchannel fluid circuit, which has more uniform heat transfer, higher heat dissipation capacity and efficiency, and better structural stability and mechanical properties.

[0019] 3. The present invention adopts the bionic structure design of dragonfly wings. Based on the bionic wall roughness of the dragonfly wing structure, the temperature and velocity fluctuation range of the magnetic nanofluid can be effectively improved, thereby enhancing the fluid disturbance and velocity, and then generating a large number of regular eddies in a large range, effectively reducing the range and height of the low-speed and high-temperature zones near the wall, and reducing the heat transfer resistance between the fluid and the wall, and at the same time effectively enhancing the flow and heat transfer performance of the rectangular microchannel network. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a structural schematic diagram of a magnetic field controlled phase change system coupled with a microchannel cooling system in a microgravity environment of the present invention.

[0022] Figure 2 yes Figure 1 Side view of.

[0023] Figure 3 It is the left view of 2.

[0024] Figure 4 It is a schematic diagram of the structure inside the shell of a magnetic field controlled phase change system coupled with a microchannel cooling system in a microgravity environment of the present invention.

[0025] Figure 5 It is a schematic diagram of the internal structure of a microchannel tube of a magnetic field-controlled phase change system coupled with a microchannel cooling system in a microgravity environment of the present invention.

[0026] Figure 6 This is a working flow chart of a magnetic field regulated phase change system coupled with a microchannel cooling system in a microgravity environment of the present invention. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] Example

[0029] Reference Figures 1 to 4 ,as well as Figure 6The present embodiment relates to a cooling system, comprising a magnetic field generator 1, a shell 2, a microchannel network 3 and a magnetic phase change material 4; the shell 2 is used to fit with a target electronic device 10 for thermal control, the microchannel network 3 is configured as a honeycomb structure, and the magnetic phase change material 4 is filled in a receiving cavity 41 formed by the honeycomb structure; the inlet 31 and the outlet 32 ​​of the microchannel network 3 are used to connect with a magnetic nanofluid to form a magnetic nanofluid circulation and heat dissipation loop; the magnetic field generator 1 controls the melting speed of the magnetic phase change material 4 and controls the heat conduction speed of the phase change material, so that the magnetic field generator 1 controls the flow speed of the magnetic nanofluid after the phase change material is melted and controls the speed of taking the heat of the phase change material out of the outside.

[0030] In this structure, the microchannel pipe network 3 is set as a honeycomb structure, and the magnetic phase change material 4 is filled in the accommodating cavity 41 inside the honeycomb structure, and a magnetic nanofluid circulation heat dissipation circuit is set in the honeycomb structure. When the shell 2 absorbs the heat emitted by the target electronic device 10 of thermal control, the heat is gradually transferred from the phase change material in the adjacent accommodating cavity 41 to the phase change material in the closer accommodating cavity 41. The phase change material in the adjacent accommodating cavity 41 first absorbs heat and the temperature rises, while the temperature of the phase change material in the accommodating cavity 41 far from the target electronic device gradually becomes lower than the temperature of the phase change material in the adjacent accommodating cavity 41, thereby forming a temperature gradient. When the direction of the magnetic field generated by the coil is opposite to the temperature gradient direction of the magnetic phase change material 4, the melting process of the magnetic phase change material 4 can be strengthened, thereby improving the heat transfer speed and efficiency; when the directions are the same, the magnetic field generated by the coil can inhibit the melting process of the magnetic phase change material 4, thereby reducing the speed and efficiency of heat transfer and reducing the loss of heat. At this time, the magnetic phase change material 4 plays a role in heat preservation. At the same time, by controlling the size and direction of the magnetic field, the flow rate of the magnetic nanofluid after the phase change material is melted can be controlled, and the speed at which the heat of the phase change material is taken out of the outside world can be controlled, thereby increasing or decreasing the speed and efficiency of heat transfer. It has the advantages of ingenious structural design, simple control, adjustable heat dissipation efficiency and stable and reliable.

[0031] The vacant cavity is in the shape of a regular hexagon. The magnetic nanofluid enters the honeycomb structure through the inlet of the microchannel pipe network 3 and takes out the heat accumulated in the magnetic phase change material 4 in the accommodating cavity 41, and takes it away to the outside through the outlet of the microchannel pipe network 3. The microchannel pipe network 3 of this structure is designed as a honeycomb structure, which greatly improves the thermal conductivity and thus enhances the heat transfer efficiency of transferring the heat of the phase change material to the outside. Therefore, the honeycomb structure has a complex hexagonal microchannel fluid circuit, with more uniform heat transfer, higher heat dissipation capacity and efficiency, and better structural stability and mechanical properties.

[0032] like Figure 5As shown, the inner wall of the microchannel network 3 is provided with a protrusion 33 for enhancing fluid disturbance and velocity. In order to further enhance fluid disturbance and velocity, the protrusion 33 is a protrusion ring, and the protrusion ring is evenly arranged along the length direction of the microchannel network 3. The cross section of the protrusion ring is square. The protrusion 33 or the protrusion ring adopts the bionic structure design of the dragonfly wing. Based on the bionic wall roughness of the dragonfly wing structure, the temperature and velocity fluctuation range of the magnetic nanofluid can be effectively improved, thereby enhancing the fluid disturbance and velocity, and then generating a large number of regular eddies in a large range, effectively reducing the range and height of the low-speed zone and the high-temperature zone near the wall, and reducing the heat transfer resistance between the fluid and the wall, and at the same time, the flow and heat transfer performance of the rectangular microchannel network 3 can be effectively enhanced.

[0033] The inner wall of the microchannel pipe network 3 is provided with a super hydrophobic coating 34. By providing the coating 34 on the inner wall of the microchannel pipe network 3, the purposes of waterproofing, corrosion prevention, ice prevention, anti-adhesion, and self-cleaning can be achieved, and the stickiness between the magnetic nanofluid and the inner wall of the microchannel pipe network 3 during the flow process in the microchannel pipe network 3 can be reduced, thereby reducing the energy consumption of the flow of the magnetic nanofluid and improving the service life of the microchannel pipe network 3.

[0034] The magnetic field generator 1 includes at least one pair of coils 11, each pair of coils 11 is respectively arranged on both sides of the housing 2; each pair of coils 11 is parallel to each other and coaxially distributed; the coils 11 are Helmholtz coils 11. The currents passing through the Helmholtz coils 11 have the same direction and the same magnitude. When the distance between each pair of coils 11 is equal to the radius of the coils 11, the two coils 11 can generate a wide range of uniform magnetic fields near the midpoint of the common axis of the two. By controlling the magnitude and direction of the magnetic field, the melting process of the magnetic phase change material 4 can be controlled, and the flow speed of the magnetic nanofluid can be controlled to control the speed of taking the heat of the phase change material out of the outside, thereby increasing or decreasing the speed and efficiency of heat transfer, and has the advantages of simple control, adjustable heat dissipation efficiency, and stable and reliable.

[0035] The magnetic phase change material 4 is paraffin composite magnetic nanoparticles. Paraffin composite magnetic nanoparticles can greatly improve the thermal conductivity of paraffin.

[0036] The two ends of the microchannel pipe network 3 are sealed and connected to the shell 2, and the magnetic phase change material 4 is sealed in the accommodating cavity 41. The multiple accommodating cavities 41 are tightly adhered together, which greatly increases the contact area between each other. When the shell 2 absorbs the heat emitted by the target electronic device 10 of thermal control, the heat is gradually transferred from the phase change material in the adjacent accommodating cavity 41 to the phase change material in the closer accommodating cavity 41. The phase change material in the adjacent accommodating cavity 41 first absorbs heat and the temperature rises, while the temperature of the phase change material in the accommodating cavity 41 far away from the target electronic device is gradually lower than the temperature of the phase change material in the adjacent accommodating cavity 41, thereby forming a temperature gradient. When the direction of the magnetic field generated by the coil 11 is opposite to the temperature gradient direction of the magnetic phase change material 4, the melting process of the magnetic phase change material 4 can be strengthened, thereby improving the heat transfer speed and efficiency; when the directions are the same, the magnetic field generated by the coil 11 can inhibit the melting process of the magnetic phase change material 4, thereby reducing the speed and efficiency of heat transfer and reducing heat loss. At this time, the magnetic phase change material 4 plays a role in heat preservation.

[0037] The housing 2 is made of a high thermal conductivity copper plate, and a storage bin 21 for storing magnetic nanofluid is provided inside the housing 2. The storage bin 21 is connected to the output port of the magnetic nanofluid supply device, and the inlet of the microchannel pipe network 3 is connected to the storage bin 21.

[0038] The above disclosure is only a preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A magnetic field controlled phase change system coupled microchannel cooling system in a microgravity environment, characterized in that: It comprises a magnetic field generator, a shell, a microchannel network and a magnetic phase change material; the shell is used to fit with the target electronic device of thermal control, the microchannel network is set as a honeycomb structure, and the magnetic phase change material is filled in the accommodating cavity formed by the honeycomb structure; the inlet and outlet of the microchannel network are used to connect with the magnetic nanofluid to form a magnetic nanofluid circulation and heat dissipation loop; the magnetic field generator controls the melting speed of the magnetic phase change material and controls the heat conduction speed of the phase change material, so that the magnetic field generator controls the flow speed of the magnetic nanofluid after the phase change material is melted and controls the speed of taking the heat of the phase change material out of the outside.

2. The magnetic field controlled phase change system coupled microchannel cooling system in a microgravity environment according to claim 1, characterized in that: The accommodating cavity is in a regular hexagonal shape.

3. The magnetic field controlled phase change system coupled microchannel cooling system in a microgravity environment according to claim 1, characterized in that: The inner wall of the microchannel network is provided with protrusions for enhancing fluid disturbance and velocity.

4. The magnetic field controlled phase change system coupled microchannel cooling system in a microgravity environment according to claim 3, characterized in that: The protrusions are protrusion rings, and the protrusion rings are evenly arranged along the length direction of the microchannel tube.

5. The magnetic field controlled phase change system coupled microchannel cooling system in a microgravity environment according to claim 3, characterized in that: The inner wall of the microchannel network is provided with a super-hydrophobic coating.

6. The magnetic field controlled phase change system coupled microchannel cooling system in a microgravity environment according to claim 1, characterized in that: The magnetic field generator comprises at least one pair of coils, each pair of coils is arranged on two sides of the shell respectively; each pair of coils are parallel to each other and coaxially distributed; the currents flowing into the coils have the same direction and equal current magnitude.

7. The magnetic field controlled phase change system coupled microchannel cooling system in a microgravity environment according to claim 6, characterized in that: The distance between each pair of coils is equal to the radius of the coil.

8. The magnetic field controlled phase change system coupled microchannel cooling system in a microgravity environment according to claim 6, characterized in that: The coil is a Helmholtz coil.

9. The magnetic field controlled phase change system coupled microchannel cooling system in a microgravity environment according to claim 1, characterized in that: The magnetic phase change material is paraffin composite magnetic nanoparticles.

10. The magnetic field controlled phase change system coupled microchannel cooling system in a microgravity environment according to claim 1, characterized in that: Both ends of the microchannel network are sealed and connected to the shell, and the magnetic phase change material is sealed in the accommodating cavity.

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