TW202413875A - Two-phase immersion-cooling heat-dissipation structure having fins for facilitating bubble generation - Google Patents

Abstract

A two-phase immersion-cooling heat-dissipation structure having fins for facilitating bubble generation is provided. The structure includes a substrate and a plurality of fins. The substrate has opposite fin and non-fin surfaces. The non-fin surface is used for contacting the heat source immersed in the two-phase coolant, and the fin surface is connected with the fins. At least half of the fins are functional fins. The included angle between at least one side of the functional fin and the fin surface is between 80 and 100 degrees. The center line average roughness Ra of the one side of the functional fin is less than 3μm, and the ten point average roughness Rz of the one side of the functional fin is not less than 12μm, so that the one side of the functional fin is a smooth surface, but having many deep holes, for facilitating the generation and detachment of bubbles.

Description

Two-phase immersion heat sink with fins to promote bubble generation

The present invention relates to a heat dissipation structure, and more particularly to a two-phase immersion heat dissipation structure with fins for promoting bubble generation.

Immersion cooling technology is to immerse heat-generating components (such as servers, disk arrays, etc.) directly in non-conductive cooling liquid, so that the cooling liquid absorbs heat and evaporates to remove the heat energy generated by the operation of the heat-generating components. However, how to dissipate heat more effectively through immersion cooling technology has always been a problem that the industry needs to solve.

In view of this, the inventor has been engaged in the development and design of related products for many years and feels that the above-mentioned deficiencies can be improved. Therefore, he has conducted intensive research and applied academic theories, and finally proposed the present invention which has a reasonable design and effectively improves the above-mentioned deficiencies.

The technical problem to be solved by the present invention is to provide a two-phase immersion heat dissipation structure with fins that promote bubble generation in view of the shortcomings of the prior art.

The embodiment of the present invention discloses a two-phase immersion heat dissipation structure with fins that promote bubble generation, which includes a heat dissipation base and a plurality of fins. The heat dissipation base has a fin surface and a non-fin surface that are opposite to each other. The non-fin surface is used to form contact with a heat source immersed in a two-phase cooling liquid. The fin surface is connected to the plurality of fins, and at least half of the plurality of fins are functional fins. The functional fin has at least one side surface with an angle of 80 to 100 degrees with the fin surface, and the centerline average roughness Ra of the side surface is less than 3 μm, and the ten-point average roughness Rz is not less than 12 μm, so that the side surface is a smooth plane but has a plurality of deeper holes distributed thereon, thereby promoting the generation and separation of bubbles.

In a preferred embodiment, the ten-point average roughness Rz of the side surface is greater than six times the centerline average roughness Ra of the side surface.

In a preferred embodiment, the functional fin is one of a needle-shaped fin or a plate-shaped fin.

In a preferred embodiment, the functional fin is made of one of copper, copper alloy and aluminum alloy.

In a preferred embodiment, the side surface is formed by grinding and/or bead peening.

In a preferred embodiment, the side surface is formed by chemical etching.

In a preferred embodiment, the side surface is formed by deposition.

To further understand the features and technical contents of the present invention, please refer to the following detailed description and drawings of the present invention. However, the drawings provided are only used for reference and description and are not used to limit the present invention.

The following is a specific embodiment to illustrate the implementation methods disclosed by the present invention. Technical personnel in this field can understand the advantages and effects of the present invention from the content disclosed in this specification. The present invention can be implemented or applied through other different specific embodiments. The details in this specification can also be modified and changed in various ways based on different viewpoints and applications without departing from the concept of the present invention. In addition, the drawings of the present invention are only for simple schematic illustrations and are not depicted according to actual sizes. Please note in advance. Moreover, the same or similar parts in the drawings are marked with the same reference numerals. The following implementation methods will further explain the relevant technical contents of the present invention in detail, but the disclosed contents are not intended to limit the scope of protection of the present invention. In addition, the term "or" used herein may include any one or more combinations of the associated listed items as appropriate.

[First embodiment]

Please refer to FIG. 1 and FIG. 2, which are the first embodiment of the present invention. The embodiment of the present invention provides a two-phase immersion heat sink structure with fins that promote bubble generation, which is used to contact a heat source/heat generating element immersed in a two-phase cooling liquid. As shown in FIG. 1, the two-phase immersion heat sink structure with fins that promote bubble generation provided by the embodiment of the present invention includes a heat sink base 10 and a plurality of fins 20.

In this embodiment, the heat sink base 10 can be made of a high thermal conductivity material, such as aluminum, copper or their alloys. The heat sink base 10 can be a non-porous heat sink or a porous heat sink. Preferably, the heat sink base 10 can be a porous heat sink immersed in a two-phase cooling liquid 900 (such as an electronic fluoride liquid) with a porosity greater than 8%, which is used to increase the amount of bubble generation to enhance the immersion heat dissipation effect.

In this embodiment, the heat sink base 10 has a fin surface 101 and a non-fin surface 102 facing each other. The non-fin surface 102 of the heat sink base 10 is used to form contact with the heat source 800 immersed in the two-phase cooling liquid 900, and this contact can be formed directly or indirectly through an intermediate layer. The fin surface 101 of the heat sink base 10 is connected to a plurality of fins 20, and the heat sink base 10 and the fins 20 can be integrally connected by metal injection molding (MIM) or skiving process, or connected by welding. Furthermore, the fin 20 may be a pin fin or a plate fin, and may be made of copper, copper alloy or aluminum alloy.

In this embodiment, at least half of the multiple fins 20 are functional fins 20a, and they can be located directly above the heat source 800 or at a position corresponding to the heat source 800. In addition, at least one side surface 201 of the functional fin 20a has an angle between 80 degrees and 100 degrees with the fin surface 101, that is, the side surface 201 and the fin surface 101 are substantially perpendicular. Furthermore, since the immersion heat dissipation effect mainly depends on the speed and amount of bubble generation, the center line average roughness Ra (center line average roughness Ra) of the side surface 201 of the functional fin 20a of the present embodiment must be less than 3 μm, and the ten-point average roughness Rz (ten-point average roughness Rz) must be not less than 12 μm, so that the side surface 201 of the functional fin 20a is a smooth plane but has a plurality of deeper holes (as shown in FIG. 2 ), so that the deeper holes are conducive to the generation of bubbles, and the smoother plane is conducive to the detachment of bubbles after generation, so as to enhance the immersion heat dissipation effect.

Furthermore, the ten-point average roughness Rz of the functional fin side surface 201 of the present embodiment must be six times greater than the center line average roughness Ra to achieve a more significant effect.

In this embodiment, the side surface 201 of the functional fin 20a may be formed by grinding and/or shot peening, that is, hard sand particles may be used to impact the functional fin 20a at high speed, so that the functional fin 20a is formed with a predetermined side surface 201.

In this embodiment, the side surface 201 of the functional fin 20a can be formed by chemical etching. In other words, the side surface 201 of the functional fin 20a can be formed by chemical etching using a chemical agent, and can be formed by chemical etching using a phosphoric acid-based micro-etching agent, a sulfuric acid-based micro-etching agent, or a ferric chloride-based micro-etching agent.

In this embodiment, the side surface 201 of the functional fin 20a can also be formed by deposition. Specifically, the side surface 201 of the functional fin 20a can be formed by liquid phase deposition or vapor phase deposition (physical or chemical vapor phase deposition).

[Second embodiment]

Please refer to FIG3 , which is a second embodiment of the present invention. This embodiment is substantially the same as the first embodiment, and the differences are described as follows.

In this embodiment, the side surface 201 of the functional fin 20b defines a first surface 2011 and a second surface 2012 connected to each other, the angle between the first surface 2011 and the fin surface 101 is between 80 degrees and 100 degrees, and the angle between the second surface 2012 and the fin surface 101 is less than 75 degrees, so that a sharp-angled notch structure C is formed between the second surface 2012 of the side surface 201 of the functional fin 20b and the fin surface 101. Therefore, a sharp-angled notch structure C is formed between the second surface 2012 of the side surface 201 of the functional fin 20b of the present embodiment and the fin surface 101, so that the heat transfer path of the heat source 800 can be limited, and local high temperature is generated at the sharp corner of the sharp-angled notch structure C. Therefore, the present embodiment is not only conducive to bubble generation because of the local high temperature, but also because the sharp-angled notch structure C can increase the contact area to facilitate bubble generation.

In summary, the two-phase immersion heat dissipation structure with fins that promote bubble generation provided by the present invention can at least be achieved through "heat dissipation base", "multiple fins", "the heat dissipation base has a fin surface and a non-fin surface opposite to each other, the non-fin surface is used to form contact with a heat source immersed in the two-phase cooling liquid, and the fin surface is connected to the multiple fins", "at least half of the multiple fins are functional fins", "at least one side of the functional fin is connected to the fin The side angle of the fin is between 80 and 100 degrees, the centerline average roughness Ra of the side is less than 3μm, and the ten-point average roughness Rz is not less than 12μm. The technical solution makes the side of the functional fin a smooth plane but with multiple deeper holes. The deeper holes are conducive to the formation of bubbles, and the smoother plane is conducive to the detachment of bubbles after formation, so as to effectively enhance the overall immersion heat dissipation effect.

The contents disclosed above are only preferred feasible embodiments of the present invention and are not intended to limit the scope of the patent application of the present invention. Therefore, all equivalent technical changes made using the contents of the specification and drawings of the present invention are included in the scope of the patent application of the present invention.

10: heat dissipation base 101: fin surface 102: non-fin surface 20: fin 20a, 20b: functional fin 201: side surface 2011: first surface 2012: second surface C: sharp notch structure 800: heat source 900: two-phase cooling liquid

FIG1 is a schematic side view of the structure of the first embodiment of the present invention.

FIG. 2 is an enlarged schematic diagram of part II of FIG. 1 .

FIG3 is a schematic side view of the structure of the second embodiment of the present invention.

10: Heat dissipation base

101: Fin side

102: Non-fin side

20: Fins

20a: Functional fins

201: Side

800: Heat source

900: Two-phase cooling liquid

Claims (7)

A two-phase immersion heat dissipation structure with fins for promoting bubble generation includes a heat dissipation base and a plurality of fins. The heat dissipation base has a fin surface and a non-fin surface opposite to each other. The non-fin surface is used to form contact with a heat source immersed in a two-phase cooling liquid. The fin surface is connected to the plurality of fins, and at least half of the plurality of fins are functional fins. The functional fin has at least one side surface with an angle between 80 and 100 degrees with the fin surface, and the centerline average roughness Ra of the side surface is less than 3 μm, and the ten-point average roughness Rz is not less than 12 μm, so that the side surface is a smooth plane but has a plurality of deeper holes distributed thereon, thereby promoting the generation and separation of bubbles. A two-phase immersion heat dissipation structure with fins that promote bubble generation as described in claim 1, wherein the ten-point average roughness Rz of the side surface is greater than six times the centerline average roughness Ra of the side surface. A two-phase immersed heat dissipation structure with fins that promote bubble generation as described in claim 1, wherein the functional fin is one of a needle-shaped fin or a plate-shaped fin. A two-phase immersion heat sink structure with fins that promote bubble generation as described in claim 1, wherein the functional fins are made of one metal selected from the group consisting of copper, copper alloy, and aluminum alloy. A two-phase immersion heat dissipation structure with fins that promote bubble generation as described in claim 1, wherein the side surface is formed by grinding and/or bead peening. A two-phase immersion heat sink structure with fins that promote bubble generation as described in claim 1, wherein the side surface is formed by chemical etching. A two-phase immersion heat dissipation structure with fins that promote bubble generation as described in claim 1, wherein the side surface is formed by deposition.

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