A two-phase tesla heat exchanger

Abstract

This invention discloses a two-phase Tesla heat exchanger, relating to the field of two-phase liquid cooling technology, comprising: a heat exchanger body having a medium inlet and a medium outlet; and a flow channel group, wherein multiple flow channel groups are arranged along the edge of the heat exchanger body, and at least one Tesla valve flow channel is provided in each flow channel group. The beginning of the forward flow path of the Tesla valve flow channel is connected to the medium inlet, and the end of the forward flow path is connected to the medium outlet. The Tesla valve flow channels in adjacent flow channel groups face opposite directions. In this invention, based on the Tesla valve flow channels, the alternating forward and reverse Tesla valve flow channels can transfer heat to each other, reducing the subcooling of the fluid at the flow channel inlet, promoting the nucleation effect in the initial section, enhancing boiling heat transfer, and simultaneously reducing the superheat of the fluid in the flow channel outlet section, suppressing the risk of drying out in the outlet section, and effectively improving the overall heat exchange effect of the heat exchanger.

Description

Technical Field

[0001] This invention relates to the field of two-phase liquid cooling technology, and in particular to a two-phase Tesla heat exchanger. Background Technology

[0002] The explosive growth of generative AI and machine learning (ML) applications has led to a surge in demand for accelerators, resulting in a rapid increase in their thermal design power (TDP). Traditional air cooling and single-phase liquid cooling methods are no longer sufficient to meet these needs. Two-phase flow heat transfer has become a research hotspot due to its high heat dissipation capacity, and it is also crucial in many practical applications, such as thermal management, within confined spaces.

[0003] Two-phase flow heat transfer benefits from high specific surface area and the latent heat released during the liquid-vapor phase transition, giving it the potential to achieve high heat transport performance. However, the accompanying physical scale effects, coupled with the huge specific volume difference between the liquid and vapor phases, present two major challenges to two-phase flow heat transfer in confined spaces: first, severe vapor reflux makes directional transport difficult; second, the flow field is chaotic, resulting in poor flow stability and a tendency for low nucleation rates and localized drying.

[0004] The applicant has a known technology that uses a Tesla valve flow channel for flow guidance, which can solve the problems of steam backflow and flow instability to a certain extent. However, due to the high temperature of the liquid when it enters and the large vaporization when it exits, the Tesla valve flow channel has problems of high liquid subcooling in the inlet section and cavitation growth in the outlet section, which leads to poor heat exchange effect.

[0005] Therefore, there is an urgent need for a two-phase Tesla heat exchanger with good heat exchange performance. Summary of the Invention

[0006] The purpose of this invention is to provide a two-phase Tesla heat exchanger to solve the problems existing in the prior art. By using Tesla valve channels arranged in alternating directions, the supercooling of the fluid at the inlet of the channel is reduced, the risk of drying out at the outlet section is suppressed, and the heat exchange effect is improved.

[0007] To achieve the above objectives, the present invention provides the following solution: The present invention provides a two-phase Tesla heat exchanger, comprising: The heat exchanger body is provided with a medium inlet and a medium outlet; The flow channel group comprises multiple flow channel groups arranged along the edge direction of the heat exchanger body. Each flow channel group is provided with at least one Tesla valve flow channel. The beginning of the forward flow path of the Tesla valve flow channel is connected to the medium inlet, and the end of the forward flow path is connected to the medium outlet. The Tesla valve flow channels in adjacent flow channel groups face opposite directions.

[0008] Preferably, when the flow channel group is provided with multiple Tesla valve flow channels, the multiple Tesla valve flow channels are arranged in parallel and at equal intervals.

[0009] Preferably, the Tesla valve channels of adjacent flow channel groups are parallel to each other.

[0010] Preferably, the heat exchanger body is provided with a fluid distribution chamber, and the medium inlet is connected to the Tesla valve flow channel in the plurality of flow channel groups through the fluid distribution chamber.

[0011] Preferably, the fluid distribution chamber is connected to the Tesla valve flow channel through a jet orifice.

[0012] Preferably, the plurality of flow channel groups are arranged along the length or width of the heat exchanger body, and the extension direction of the Tesla valve flow channel is perpendicular to the arrangement direction of the plurality of flow channel groups.

[0013] Preferably, the number of Tesla valve channels in the channel group is the same.

[0014] Preferably, the number of Tesla valve channels within the flow channel group is different.

[0015] Preferably, the plurality of flow channel groups are arranged along the thickness direction of the heat exchanger body, and the Tesla valve flow channel extends along the length or width direction of the heat exchanger body.

[0016] Preferably, the flow channel group is provided with multiple Tesla valve flow channels located in the same plane, and the planes where the Tesla valve flow channels of adjacent flow channel groups are located are parallel to each other.

[0017] The present invention achieves the following main technical effects compared to the prior art: Tesla valve channels themselves enhance turbulence and boundary layer disruption, reduce bubble aggregation, directional rectification, suppress two-phase backflow, and improve the stability of two-phase heat exchange flow. Moreover, Tesla valve channels in adjacent channel groups are arranged alternately in the forward and reverse directions, and the liquid flows along the forward direction of the Tesla valve channels for boiling heat exchange. The alternating Tesla valve channels can transfer heat to each other, reduce the subcooling of the fluid at the channel inlet, promote the nucleation effect in the initial section, enhance boiling heat exchange, and at the same time reduce the superheat of the fluid in the channel outlet section, suppress the risk of drying out in the outlet section, and effectively improve the heat exchange effect of the overall heat exchanger. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the external structure of the two-phase Tesla heat exchanger in an embodiment of the present invention; Figure 2 This is a front view of an example of a two-phase Tesla heat exchanger in an embodiment of the present invention; Figure 3 for Figure 2 Sectional view at point AA; Figure 4 This is a front view of Example 2 of the two-phase Tesla heat exchanger in this embodiment of the invention; Figure 5 for Figure 4 Sectional view at point AA; Figure 6 This is a front view of Example 3 of the two-phase Tesla heat exchanger in the embodiments of the present invention; Figure 7 for Figure 6 Sectional view at point AA; Figure 8 This is a front view of Example 4 of the two-phase Tesla heat exchanger in the embodiments of the present invention; Figure 9 for Figure 8 Sectional view at point AA; Figure 10 for Figure 8 Sectional view at point BB; The components include: 1. Heat exchanger body; 2. Medium inlet; 3. Medium outlet; 4. Tesla valve flow channel. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] The purpose of this invention is to provide a two-phase Tesla heat exchanger to solve the problems existing in the prior art. By using Tesla valve channels arranged in alternating directions, the supercooling of the fluid at the inlet of the channel is reduced, the risk of drying out at the outlet section is suppressed, and the heat exchange effect is improved.

[0022] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] Please refer to the following: Figures 1-10As shown, a two-phase Tesla heat exchanger is provided, including: a heat exchanger body 1 and a flow channel assembly. The heat exchanger body 1 is provided with a medium inlet 2 and a medium outlet 3. Multiple flow channel assemblies are arranged in the heat exchanger body 1 along the edge direction, which here includes the length direction, width direction, and thickness direction. At least one Tesla valve flow channel 4 is provided in the flow channel assembly. The beginning of the forward flow path of the Tesla valve flow channel 4 is connected to the medium inlet 2, and the end of the forward flow path is connected to the medium outlet 3. The connection method of 2 and the connection method with the medium outlet 3 are not limited. The purpose is to be able to supply the medium into the Tesla valve flow channel 4 and allow the medium in the Tesla valve flow channel 4 to flow out. The Tesla valve flow channels 4 in adjacent flow channel groups face opposite directions. The alternating forward and reverse Tesla valve flow channels 4 can transfer heat to each other, reduce the subcooling of the fluid at the flow channel inlet, promote the nucleation effect in the initial section, enhance boiling heat transfer, and at the same time reduce the superheating of the fluid in the flow channel outlet section, suppress the risk of drying in the outlet section, and effectively improve the heat transfer effect of the overall heat exchanger.

[0024] In one embodiment, when multiple Tesla valve channels 4 are provided in the flow channel group, the multiple Tesla valve channels 4 are arranged in parallel and at equal intervals. The parallel and equal interval arrangement is equivalent to improving the distribution uniformity of the multiple Tesla valve channels 4 in the flow channel group, which can improve the heat exchange effect in subsequent heat exchange.

[0025] Multiple Tesla valve channels 4 arranged in parallel and equally spaced within a single flow channel group can improve the heat exchange effect. Additional parallel Tesla valve channels 4 in adjacent flow channel groups ensure that all Tesla valve channels 4 within the overall heat exchanger body 1 are distributed in parallel, thereby improving the overall heat exchange effect. The spacing between two adjacent Tesla valve channels 4 in adjacent flow channel groups can be set to be the same as the spacing between adjacent Tesla valve channels 4 in a single flow channel group, so as to achieve parallel and equally spaced Tesla valve channels 4 within the overall heat exchanger body 1, further improving the heat exchange effect.

[0026] In one embodiment, a fluid distribution chamber is provided inside the heat exchanger body 1. The medium inlet 2 is connected to the Tesla valve flow channel 4 in multiple flow channel groups through the fluid distribution chamber. The fluid distribution chamber plays a role in diverting the flow and improving the uniformity of the medium entering the multiple Tesla valve flow channels 4, so as to ensure the heat exchange effect of the device.

[0027] In one embodiment, the fluid distribution chamber is connected to the Tesla valve channel 4 through a jet orifice. The medium is supplied into the Tesla valve channel 4 by jetting, which can break the boundary layer, flush out bubbles, prevent dry burning, increase CHF, and stabilize the temperature and flow, making the two-phase liquid cooling more stable and stronger in heat flux.

[0028] In one embodiment, multiple flow channel groups are arranged along the length or width of the heat exchanger body 1, and the extension direction of the Tesla valve flow channel 4 is perpendicular to the arrangement direction of the multiple flow channel groups, forming a rectangular structure. The number of Tesla valve flow channels 4 in the flow channel group can be the same or different.

[0029] In one embodiment, multiple flow channel groups are arranged along the thickness direction of the heat exchanger body 1, and the Tesla valve flow channels 4 extend along the length or width direction of the heat exchanger body 1. Specifically, multiple Tesla valve flow channels 4 located in the same plane are provided in the flow channel group, and the planes where the Tesla valve flow channels 4 of adjacent flow channel groups are located are parallel to each other. That is, the planes where all Tesla valve flow channels 4 in one flow channel group are located are parallel to the planes where all Tesla valve flow channels 4 in another flow channel group are located. Along the thickness direction of the heat exchanger body 1, the Tesla valve flow channels 4 in different flow channel groups can be staggered or directly opposite each other.

[0030] Here are some practical design examples: Example 1: Tesla valve flow channels with alternating positive and negative flow patterns 4 In this example, each flow channel group includes a Tesla valve flow channel 4, and multiple Tesla valve flow channels 4 are arranged in parallel and at equal intervals along the length direction of the heat exchanger body 1.

[0031] Example 2: Tesla valve flow channel with alternating positive and negative flow paths 4 In this example, each flow channel group includes two Tesla valve flow channels 4, and multiple Tesla valve flow channels 4 are arranged in parallel and at equal intervals along the length direction of the heat exchanger body 1.

[0032] Example 3: Tesla valve flow channel with alternating positive and negative flow patterns 4 In this example, each flow channel group includes three Tesla valve flow channels 4, and multiple Tesla valve flow channels 4 are arranged in parallel and at equal intervals along the length direction of the heat exchanger body 1.

[0033] Example 4: Tesla valve flow channels with alternating planar configurations 4 In this example, there are two flow channel groups. Each flow channel group includes multiple Tesla valve flow channels 4. The multiple Tesla valve flow channels 4 in each flow channel group are located on the same plane, and the plane is parallel to the heat exchange surface of the heat exchanger body 1. The two flow channel groups are arranged sequentially along the direction away from the heat exchange surface of the heat exchanger body 1 (the thickness direction of the heat exchanger body). The Tesla valve flow channels 4 in the two flow channel groups correspond one-to-one and face opposite directions.

[0034] Any adaptive changes made according to actual needs are within the scope of protection of this invention.

[0035] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0036] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A two-phase Tesla heat exchanger, characterized in that, include: The heat exchanger body is provided with a medium inlet and a medium outlet; The flow channel group comprises multiple flow channel groups arranged along the edge direction of the heat exchanger body. Each flow channel group is provided with at least one Tesla valve flow channel. The beginning of the forward flow path of the Tesla valve flow channel is connected to the medium inlet, and the end of the forward flow path is connected to the medium outlet. The Tesla valve flow channels in adjacent flow channel groups face opposite directions.

2. The two-phase Tesla heat exchanger according to claim 1, characterized in that, When the flow channel group is provided with multiple Tesla valve flow channels, the multiple Tesla valve flow channels are arranged in parallel and at equal intervals.

3. The two-phase Tesla heat exchanger according to claim 2, characterized in that, The Tesla valve channels of adjacent flow channel groups are parallel to each other.

4. The two-phase Tesla heat exchanger according to claim 1, characterized in that, The heat exchanger body is provided with a fluid distribution chamber, and the medium inlet is connected to the Tesla valve flow channel in the plurality of flow channel groups through the fluid distribution chamber.

5. The two-phase Tesla heat exchanger according to claim 4, characterized in that, The fluid distribution chamber is connected to the Tesla valve flow channel through a jet orifice.

6. The two-phase Tesla heat exchanger according to claim 1, characterized in that, The plurality of flow channel groups are arranged along the length or width of the heat exchanger body, and the extension direction of the Tesla valve flow channel is perpendicular to the arrangement direction of the plurality of flow channel groups.

7. The two-phase Tesla heat exchanger according to claim 6, characterized in that, The number of Tesla valve channels in each flow channel group is the same.

8. The two-phase Tesla heat exchanger according to claim 6, characterized in that, The number of Tesla valve channels within the flow channel group varies.

9. The two-phase Tesla heat exchanger according to claim 1, characterized in that, Multiple flow channel groups are arranged along the thickness direction of the heat exchanger body, and the Tesla valve flow channel extends along the length or width direction of the heat exchanger body.

10. The two-phase Tesla heat exchanger according to claim 9, characterized in that, The flow channel group is provided with multiple Tesla valve flow channels located in the same plane, and the planes where the Tesla valve flow channels of adjacent flow channel groups are located are parallel to each other.

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