Two-phase microchannel cold plate

Abstract

The utility model belongs to the micro -channel flow and phase change heat transfer technical field, concretely relates to a high stability two -phase micro -channel cold plate, including casing, tesla type micro -channel, shunt groove and confluence groove, the shunt groove is established in one side in the casing, the confluence groove is established in the other side in the casing, the middle part of casing is equipped with a plurality of equidistance arrangement's tesla type micro -channel, and tesla type micro -channel includes linear micro -channel and curved micro -channel, and each linear micro -channel is provided with a plurality of curved micro -channels in communication on each linear micro -channel. The utility model uses, and the curved micro -channel of tesla micro -channel is placed in the top of linear micro -channel to replace the curved micro -channel of traditional tesla type micro -channel and is placed in the two sides of linear micro -channel, has retained the function of tesla type micro -channel to inhibit the counterflow of working medium, has improved its critical heat flux density significantly.

Description

Technical Field

[0001] This invention belongs to the field of microchannel flow and phase change heat transfer technology, specifically, it relates to a two-phase microchannel cold plate, and more particularly to a highly stable two-phase microchannel cold plate. Background Technology

[0002] Integrated microchannel cold plate pump-driven two-phase fluid loop system and heat pump system are one of the important technical routes to solve the heat dissipation of high power and high heat flux density in spacecraft.

[0003] However, the instability of two-phase flow within microchannel cold plates significantly restricts the widespread application of pump-driven two-phase fluid loop technology and heat pump technology. To improve the stability of two-phase flow within microchannels, domestic and international researchers primarily increase the resistance to counter-current flow by adding a throttling controller at the inlet, thereby improving flow stability within the channel. However, the inlet throttling structure often increases the flow resistance of the microchannel. To address this issue, patent CN115540641B proposes a Tesla-type microchannel and incorporates microrib structures within the flow-splitting structure during counter-current flow to increase the critical heat flux density in that region. However, the critical heat flux density obtained through capillary transport, a passive method, is difficult to achieve the critical heat flux density achievable through pump-driven fluid heat exchange. Utility Model Content

[0004] In view of the deficiencies in the existing technology, the purpose of this utility model is to provide a highly stable two-phase microchannel cold plate.

[0005] According to the present invention, a high-stability two-phase microchannel cold plate includes a shell, a Tesla-type microchannel, a flow divider, and a flow collector. A flow divider is formed on one side of the shell, and a flow collector is formed on the other side of the shell. Several Tesla-type microchannels are arranged at equal intervals in the middle of the shell. The Tesla-type microchannels include straight microchannels and curved microchannels. Several curved microchannels are connected to each straight microchannel. The flow channel of the straight microchannel is divided into a bottom and a top. The top of the straight microchannel is connected to multiple curved microchannels. The large-diameter port of the curved microchannel is the countercurrent inlet, and the small-diameter port of the curved microchannel is the countercurrent outlet. The countercurrent inlet length b and the countercurrent outlet length a are related as b > a. The curved microchannel has a tapered structure from the countercurrent inlet to the countercurrent outlet.

[0006] Preferably, the cross-section of the Tesla-type microchannel is rectangular or circular, with an equivalent diameter D. h ≤1mm.

[0007] Preferably, the spacing between the curved microchannels along the flow direction is 5mm≤L≤20mm.

[0008] Preferably, the height h between the top and bottom of the linear microchannel is constant.

[0009] Preferably, the projection regions of the linear microchannel and the curved microchannel in the plane where the bottom of the linear microchannel is located are Z1 and Z2, respectively, and Z2∈Z1.

[0010] Preferably, the countercurrent inlet includes a first curve and a second curve, the bottom curve of the countercurrent inlet is the first curve, the top curve of the countercurrent inlet is the second curve, and the relationship between the angle of attack β1 and β2 of the first curve and the second curve when the working medium flows countercurrently is β2>β1>90°.

[0011] Preferably, the countercurrent outlet includes a third curve and a fourth curve, with the top curve of the countercurrent outlet being the third curve and the bottom curve of the countercurrent outlet being the fourth curve. The relationship between the angles of attack α1 and α2 of the third curve and the fourth curve when the working medium flows in the same direction is α1 < α2 < 90°.

[0012] Preferably, the housing is made of aluminum alloy or copper.

[0013] Preferably, a fluid inlet is provided on one side of the housing, and the fluid inlet is connected to the diversion channel.

[0014] Preferably, the diversion channel is located downstream of the fluid inlet and upstream of the Tesla-type microchannel, the fluid outlet is provided on the other side of the shell, and the confluence channel is located upstream of the fluid outlet and downstream of the Tesla-type microchannel.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. When using this utility model, the curved microchannel in the Tesla microchannel is placed on top of the straight microchannel instead of the traditional Tesla microchannel cold plate. The curved microchannel is placed on both sides of the straight microchannel, which not only retains the function of Tesla microchannel in suppressing the backflow of working fluid, but also significantly improves its critical heat flux density.

[0017] 2. When this utility model is used, the curved microchannel has a tapered structure in the counterflow direction, so that the outlet forms a jet effect when the flow reverses, which further improves the low resistance characteristics of the traditional Tesla-type microchannel in the forward flow and the flow suppression ability in the reverse flow. Attached Figure Description

[0018] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0019] Figure 1 This is a three-dimensional structural diagram of the microchannel cold plate in this utility model;

[0020] Figure 2 This is a schematic diagram of the two-dimensional structure of the microchannel cold plate in this utility model;

[0021] Figure 3 This is a schematic diagram of the fluid flow direction within the Tesla-type microchannel in this utility model;

[0022] Figure 4 This is a diagram illustrating the parameter annotations of the Tesla-type microchannel structure in this utility model.

[0023] The diagram shows:

[0024] Shell 1, Straight microchannel top 212, Counterflow inlet 225

[0025] Fluid inlet 11 Curved microchannel 22 Second curve 226

[0026] Fluid outlet 12 Third curve 221 Diversion channel 3

[0027] Tesla-type microchannel 2, counterflow outlet 222, manifold 4

[0028] Linear microchannel 21 Fourth curve 223

[0029] Straight microchannel bottom 211 First curve 224 Detailed Implementation

[0030] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0031] This utility model provides a high-stability two-phase microchannel cold plate, comprising a shell 1, a Tesla-type microchannel 2, a diversion channel 3, and a confluence channel 4. The diversion channel 3 is opened on one side of the shell 1, and the confluence channel 4 is opened on the other side of the shell 1. Several Tesla-type microchannels 2 are arranged at equal intervals in the middle of the shell 1. The diversion channel 3 and the confluence channel 4 are connected by multiple Tesla-type microchannels 2. The working fluid inside the Tesla-type microchannels 2, the diversion channel 3, and the confluence channel 4 is liquid ammonia, water, or R134a.

[0032] The housing 1 is made of aluminum alloy or copper. A fluid inlet 11 is provided on one side of the housing 1. The fluid inlet 11 is connected to the diversion channel 3. The diversion channel 3 is located downstream of the fluid inlet 11 and upstream of the Tesla-type microchannel 2. A fluid outlet 12 is provided on the other side of the housing 1. A confluence channel 4 is located upstream of the fluid outlet 12 and downstream of the Tesla-type microchannel 2.

[0033] The cross-section of the Tesla-type microchannel 2 is rectangular or circular, with an equivalent diameter D. h ≤1mm, the Tesla-type microchannel 2 includes a straight microchannel 21 and a curved microchannel 22. Each straight microchannel 21 is connected to several curved microchannels 22. The spacing between each curved microchannel 22 along the flow direction is 5mm≤L≤20mm.

[0034] The interior of the linear microchannel 21 is divided into a linear microchannel bottom 211 and a linear microchannel top 212. The linear microchannel bottom 211 is used to absorb heat from the heat source. The linear microchannel top 212 is connected to multiple curved microchannels 22. The height h between the linear microchannel top 212 and the linear microchannel bottom 211 is constant to ensure the stability of the internal fluid working medium in the linear microchannel 21. The projection regions of the linear microchannel 21 and the curved microchannel 22 in the plane where the linear microchannel bottom 211 is located are Z1 and Z2, respectively, and Z2∈Z1.

[0035] The large-diameter port of the curved microchannel 22 is the counter-flow inlet 225, and the small-diameter port is the counter-flow outlet 222. The length b of the counter-flow inlet 225 and the length a of the counter-flow outlet 222 are related as b > a. The curved microchannel 22 has a gradually narrowing structure from the counter-flow inlet 225 to the counter-flow outlet 222, causing a jet effect at the counter-flow outlet 222 when the internal working fluid flows backward, thus enhancing the heat transfer efficiency of the microchannel. The counter-flow inlet 225 includes a first curve 224 and a second curve 226. The bottom curve of the counter-flow inlet 225 is... The first curve 224, the top curve of the counter-current inlet 225 is the second curve 226, the relationship between the angles of attack β1 and β2 of the first curve 224 and the second curve 226 when the working medium is flowing counter-currently is β2>β1>90°, the counter-current outlet 222 includes the third curve 221 and the fourth curve 223, the top curve of the counter-current outlet 222 is the third curve 221, the bottom curve of the counter-current outlet 222 is the fourth curve 223, the relationship between the angles of attack α1 and α2 of the third curve 221 and the fourth curve 223 when the working medium is flowing in the same direction is α1<α2<90°.

[0036] Working principle

[0037] In use, this invention replaces the traditional Tesla-type microchannel cold plate structure where the curved microchannel 22 is placed on both sides of the straight microchannel 21 with a structure where the curved microchannel 22 is placed on top of the straight microchannel 21. This retains the function of the Tesla-type microchannel 2 in suppressing backflow of the working fluid while increasing the critical heat flux density of the Tesla-type microchannel 2. By changing the curved microchannel 22 to a gradually narrowing structure from the counterflow inlet 225 to the counterflow outlet 222, the internal fluid working fluid resistance inside the channel is reduced when flowing in the forward direction. At the same time, when the internal fluid working fluid flows in the reverse direction, the counterflow outlet 222 forms a jet effect, thereby further improving the low resistance characteristics of the traditional Tesla-type microchannel in forward flow and its ability to suppress flow in reverse flow.

[0038] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0039] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the substantive content of this utility model. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A two-phase microchannel cold plate, characterized in that, The device includes a housing (1), Tesla-type microchannels (2), a flow divider (3), and a flow collector (4). The flow divider (3) is opened on one side of the housing (1), and the flow collector (4) is opened on the other side of the housing (1). Several Tesla-type microchannels (2) are arranged at equal intervals in the middle of the housing (1). The Tesla-type microchannels (2) include straight microchannels (21) and curved microchannels (22). Several curved microchannels (22) are connected to each straight microchannel (21). The flow channels inside the straight microchannels (21) are... It is divided into a straight microchannel bottom (211) and a straight microchannel top (212). The straight microchannel top (212) is connected to multiple curved microchannels (22). The large-diameter port of the curved microchannel (22) is the counterflow inlet (225), and the small-diameter port of the curved microchannel (22) is the counterflow outlet (222). The relationship between the length b of the counterflow inlet (225) and the length a of the counterflow outlet (222) is b > a. The curved microchannel (22) has a tapered structure from the counterflow inlet (225) to the counterflow outlet (222).

2. The two-phase microchannel cold plate according to claim 1, characterized in that, The cross-section of the Tesla-type microchannel (2) is rectangular or circular, with an equivalent diameter D. h ≤1mm.

3. The two-phase microchannel cold plate according to claim 1, characterized in that, Curved microchannels (22) have a spacing of 5mm ≤ L ≤ 20mm along the flow direction.

4. The two-phase microchannel cold plate according to claim 1, characterized in that, The height h between the top (212) and the bottom (211) of the straight microchannel is constant.

5. The two-phase microchannel cold plate according to claim 1, characterized in that, The projection regions of the straight microchannel (21) and the curved microchannel (22) in the plane where the bottom (211) of the straight microchannel is located are Z1 and Z2, respectively, and Z2∈Z1.

6. The two-phase microchannel cold plate according to claim 1, characterized in that, The countercurrent inlet (225) includes a first curve (224) and a second curve (226). The bottom curve of the countercurrent inlet (225) is the first curve (224), and the top curve of the countercurrent inlet (225) is the second curve (226). The relationship between the angle of attack β1 and β2 of the first curve (224) and the second curve (226) when the working medium is flowing countercurrently is β2 > β1 > 90°.

7. The two-phase microchannel cold plate according to claim 1, characterized in that, The countercurrent outlet (222) includes the third curve (221) and the fourth curve (223). The top curve of the countercurrent outlet (222) is the third curve (221), and the bottom curve of the countercurrent outlet (222) is the fourth curve (223). The relationship between the angle of attack α1 and α2 of the third curve (221) and the fourth curve (223) when the working medium flows in the same direction is α1 < α2 < 90°.

8. The two-phase microchannel cold plate according to claim 1, characterized in that, The casing (1) is made of aluminum alloy or copper.

9. The two-phase microchannel cold plate according to claim 1, characterized in that, A fluid inlet (11) is provided on one side of the shell (1), and the fluid inlet (11) is connected to the diversion channel (3).

10. The two-phase microchannel cold plate according to claim 1, characterized in that, The diversion channel (3) is located downstream of the fluid inlet (11) and upstream of the Tesla-type microchannel (2). The fluid outlet (12) is provided on the other side of the shell (1). The confluence channel (4) is located upstream of the fluid outlet (12) and downstream of the Tesla-type microchannel (2).

Images