HEAT SINKS WITH VIBRATION ENHANCED HEAT TRANSFER FOR NON-LIQUID HEAT SOURCES
20200135614 ยท 2020-04-30
Inventors
Cpc classification
F28F13/10
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
H01L23/433
ELECTRICITY
Y02E60/14
GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
F28D21/00
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
F28D20/021
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
F28D2021/0029
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
International classification
Abstract
The heat sinks with vibration enhanced heat transfer for non-liquid heat sources are heat sinks formed from a first body of high thermal conductivity material received within a thermally conductive housing such that at least one contact face of the first body of high thermal conductivity material is exposed, forming a direct contact interface with a heat source requiring cooling. The heat source requiring cooling may be any non-liquid heat source, including a processor chip, an integrated circuit chip, a modular circuit package, or the like. The thermally conductive housing may be disposed such that at least one contact face of the thermally conductive housing is in direct contact with the vibrating base. Alternatively, the vibrating base may be attached to a support attached to the heat source. The vibrating base applies oscillating waves to the heat sink, thereby increasing heat transfer between the heat source and the heat sink.
Claims
1. A heat sink with vibration enhanced heat transfer for non-liquid heat sources, comprising: a thermally conductive housing having at least one contact face and at least one wall; a first body of high thermal conductivity material disposed within the thermally conductive housing, the first body of high thermal conductivity material having at least one contact face adapted for direct contact with a non-liquid heat source to be cooled; and a vibrating base, the vibrating base disposed in direct contact with the at least one contact face of the thermally conductive housing; wherein the vibrating base is configured to propagate oscillating waves through the thermally conductive housing and the first body of high thermal conductivity material to reach the at least one contact face adapted for direct contact with the non-liquid heat source; and wherein the first body of high thermal conductivity material is capable of forming an at least partially liquid conductive melted high thermal conductivity material layer in direct contact with the heat source.
2. The heat sink as recited in claim 1, further comprising a plurality of thermally conductive fins mounted on at least a portion of the at least one wall of the thermally conductive housing.
3. The heat sink as recited in claim 1, further comprising at least one tube having opposed first and second ends, wherein the tube is positioned in and traverses the thermally conductive housing such that the opposed first and second ends of the at least one tube are positioned outside of the thermally conductive housing.
4. The heat sink as recited in claim 3, further comprising a plurality of thermally conductive fins mounted on at least a portion of the at least one tube.
5. The heat sink as recited in claim 1, further comprising at least one thermally conductive vertical stud having opposed first and second ends, wherein the first end of the vertical stud is affixed within the at least one contact face of the thermally conductive housing and the first end of the vertical stud is in direct contact with the vibrating base.
6. The heat sink as recited in claim 5, further comprising at least one internal chamber within the at least one thermally conductive vertical stud, and a body of high thermal storage capacity material within the at least one internal chamber.
7. The heat sink as recited in claim 5, further comprising a plurality of fins mounted on at least a portion of the at least one thermally conductive vertical stud, wherein the plurality of fins are constructed of a material selected from the group consisting of a flexible material and a rigid material.
8. The heat sink as recited in claim 1, wherein the first body of high thermal conductivity material is a solid phase change material.
9. The heat sink as recited in claim 8, further comprising at least one sensor positioned on the thermally conductive housing to detect melting of the first body of high thermal conductivity material at the contact face adapted for direct contact with the non-liquid heat source to be cooled.
10. The heat sink as recited in claim 8, wherein the solid phase change material has a melting point between the temperature of the external environment and the maximum operating temperature of the heat source and wherein the solid phase change material has a melting point within the target operating temperature range for the heat source.
11. The heat sink as recited in claim 1, wherein the first body of high thermal conductivity material is a liquid.
12. The heat sink as recited in claim 1, wherein the non-liquid heat source is selected from the group consisting of a processor chip, an integrated circuit chip, and a modular circuit package.
13. The heat sink as recited in claim 1, wherein the vibrating base is configured to propagate the oscillating waves intermittently or continuously.
14. A heat sink with vibration enhanced heat transfer for non-liquid heat sources, comprising: a thermally conductive housing having at least one wall; a first body of high thermal conductivity material disposed within the thermally conductive housing, the first body of high thermal conductivity material having at least one contact face adapted for direct contact with a non-liquid heat source to be cooled; at least one support attached to the non-liquid heat source to be cooled; and at least one vibrating base, the at least one vibrating base disposed in direct contact with the at least one support; wherein the vibrating base is configured to propagate oscillating waves through the at least one support and the non-liquid heat source to be cooled to reach the at least one contact face adapted for direct contact with the first body of high thermal conductivity material.
15. The heat sink as recited in claim 14, further comprising a plurality of thermally conductive fins mounted on at least a portion of the at least one wall of the thermally conductive housing.
16. The heat sink as recited in claim 14, further comprising at least one tube having opposed first and second ends, wherein the opposed first and second ends of the at least one tube are positioned outside of the thermally conductive housing.
17. The heat sink as recited in claim 14, wherein the first body of high thermal conductivity material is a solid phase change material.
18. The heat sink as recited in claim 17, further comprising at least one sensor positioned on the thermally conductive housing to detect melting of the first body of high thermal conductivity material at the contact face adapted for direct contact with a non-liquid heat source to be cooled.
19. The heat sink as recited in claim 17, wherein the first body of high thermal conductivity material is a liquid.
20. The heat sink as recited in claim 14, wherein the non-liquid heat source is selected from the group consisting of a processor chip, an integrated circuit chip, and a modular circuit package.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0014]
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[0017]
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[0023] Similar reference characters denote corresponding features consistently throughout the attached drawings.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0024] The heat sink with vibration enhanced heat transfer for non-liquid heat sources is formed from a first body of high thermal conductivity material. The first body of high thermal conductivity material is received within a thermally conductive housing such that at least one contact face of the first body of high thermal conductivity material is exposed, forming a direct contact interface with a heat source requiring cooling. In an embodiment, the heat source requiring cooling may be any non-liquid heat source, including but not limited to a processor chip. The thermally conductive housing has at least one wall and is disposed such that at least one contact face of the thermally conductive housing is in direct contact with the vibrating base. The high thermal conductivity material may be a liquid material or a solid material at room temperature. Thus, part or all of the first body of high thermal conductivity material may be liquefied prior to exposing the heat sink to the heat source. The at least one wall of the thermally conductive housing may have a plurality of fins mounted to at least a portion thereof, outside of the first body of high thermal conductivity material. The individual fins forming the plurality of fins may have any orientation, may be straight or branched, may be solid or hollow, and/or may have any combination of these features.
[0025] As used herein, the term approximately when used to modify a numerical value means within 10% of said numerical value.
[0026] In use, heat generated by the heat source is transferred, via conduction, into the first body of high thermal conductivity material. The heat from the heat source may cause at least a portion of the first body of high thermal conductivity material, if solid, to at least partially liquefy, forming a conductive melted high thermal conductivity material layer within the first body of high thermal conductivity material and disposed in direct contact with the heat source. The conductive melted high thermal conductivity material layer may act as a liquid with a high thermal conductivity, thereby supporting heat transfer from the heat source to the conductive melted high thermal conductivity material layer and subsequently to the rest of the first body of high thermal conductivity material. The conductive melted high thermal conductivity material layer may transfer heat between the heat source and the first body of high thermal conductivity material and/or the thermally conductive housing by conduction or convection. The first body of high thermal conductivity material will thus absorb and store latent heat until it can be transferred by convection through the thermally conductive housing and be dissipated into the surrounding environment.
[0027] The vibrating base may apply oscillating waves, propagating through the thermally conductive housing and/or the first body of high thermal conductivity material, to reach the direct contact interface between the first body of high thermal conductivity material and the heat source requiring cooling, thereby increasing heat transfer between the heat source and the first body of high thermal conductivity material, and/or between the heat source and the conductive melted high thermal conductivity material layer, and/or between the conductive melted high thermal conductivity material layer and the rest of the first body of high thermal conductivity material. The oscillating waves can be any kind of wave, including for example sinusoidal waves or square waves. The oscillating waves may be applied laterally, vertically, or in any other direction, the oscillating waves may be applied continuously or intermittently. The oscillating waves may be applied when a need to dump heat from the heat source is detected, or upon detecting a need to dump more heat or dump heat at a faster rate from the heat source. The oscillating waves may be generated by any known means, including but not limited to mechanical means, ultrasound, and electrical or magnetic effects.
[0028] The heat source may be a solid body, including but not limited to a processor chip, an integrated circuit chip, a modular circuit package, or the like. If the heat source is a solid body, it may be desirable to avoid applying the vibrations directly to the heat source. The vibrations may be applied directly to the heat sink and propagated through the first body of high thermal conductivity material, to avoid direct application to the heat source.
[0029] In an embodiment, the thermally conductive housing may also have at least one sensor attached to the at least one wall of the thermally conductive housing and the at least one sensor may be positioned to detect melting of the first body of high thermal conductivity material, if solid, at the direct contact interface. In this embodiment, the at least one sensor may communicate with the vibrating base, such that the vibrating base does not apply oscillating waves until the sensor detects melting of a sufficient quantity of the first body of high thermal conductivity material to protect the heat source from being damaged by the resulting vibrations.
[0030] At the direct contact interface, the oscillating waves (vibrations) may generate active dynamic motions of the molecules of the first body of high thermal conductivity material and/or the conductive melted high thermal conductivity material layer, thereby increasing the rate of heat transfer from the heat source to the heat sink. Again, the vibrating base will not vibrate unless a sufficient quantity of the first body of high thermal conductivity material surrounding the heat source is liquid, to protect the heat source from being damaged by the resulting vibrations.
[0031] In an alternative embodiment, the present subject matter is directed to a heat sink with a vibrating base. In this embodiment, the heat sink is formed from a first body of high thermal conductivity material. The first body of high thermal conductivity material is received within a thermally conductive housing such that at least one contact face of the first body of high thermal conductivity material is exposed, forming a direct contact interface with a heat source requiring cooling. The heat source requiring cooling may be any non-liquid heat source, including but not limited to a processor chip. The heat source is attached to at least one support and said at least one support is adapted to be in direct contact with at least one vibrating base. In this embodiment, the at least one vibrating base may apply oscillating waves, propagating through the at least one support and the heat source to reach the first body of high thermal conductivity material and the direct contact interface, thereby increasing heat transfer between the heat source and the first body of high thermal conductivity material, and/or between the heat source and the conductive melted high thermal conductivity material layer, and/or between the conductive melted high thermal conductivity material layer and the rest of the first body of high thermal conductivity material. At the direct contact interface, the vibration may generate active dynamic motions of the molecules of the first body of high thermal conductivity material or the conductive melted high thermal conductivity material layer, thereby increasing the rate of heat transfer from the heat source to the heat sink. Again, the at least one vibrating base will not vibrate unless a sufficient quantity of the first body of high thermal conductivity material surrounding the heat source is liquid, to protect the heat source from being damaged by the resulting vibrations.
[0032] Referring to the embodiment of
[0033] The thermally conductive housing 12 may be selected from any suitable material that is compatible with the selected first body of high thermal conductivity material 14. For example, aluminum would not be used as a thermally conductive housing 12 material when the first body of high thermal conductivity material 14 includes elemental gallium. The at least one wall 32 of the thermally conductive housing 12 may have a plurality of fins 22 mounted to at least a portion thereof, outside of the first body of high thermal conductivity material 14. It should be understood that the positioning, overall configuration, relative dimensions, and number of thermally conductive fins 22 are shown for exemplary purposes only.
[0034] The first body of high thermal conductivity material 14 may comprise at least one high thermal conductivity material that may be liquid at intended operating conditions, or it may be a solid phase change material. The at least one high thermal conductivity material is selected such that it has a high thermal conductivity and, if the high thermal conductivity material selected is a solid phase change material, is selected such that it has a melting point between the temperature of the external environment within which the heat sink 10 is intended to operate, and the maximum operating temperature of the heat source HS. If the at least one high thermal conductivity material selected for the first body of high thermal conductivity material 14 is a phase change material, it may further be selected to have a phase change temperature at the target temperature or within the target operating temperature range to which the heat source HS is intended to be cooled. As a non-limiting example, if a heat sink 10 is intended to operate in a room maintained at 20 C. and to cool a heat source with a maximum operating temperature of 60 C., elemental gallium having a melting point of approximately 30 C. might be selected for the first body of high thermal conductivity material 14. Non-limiting examples of suitable high thermal conductivity materials for the first body of high thermal conductivity material 14 include one or more of elemental gallium, gallium alloys, paraffin with between eighteen and thirty carbons, sodium sulfate, lauric acid, trimethylolethane, p-lattic acid, methyl palmitate, camphenilone, caprylone, heptadecanone, 1-cyclohexyloctadecane, 4-heptadecanone, 3-heptadecanone, 2-heptadecanone, 9-heptadecanone, camphene, thymol, p-dichlorobenzene, heptaudecanoic acid, beeswax, glyolic acid, glycolic acid, capric acid, eladic acid, pentadecanoic acid, liquid gallium, and nano-fluids with high thermal conductivity nanoparticles.
[0035] In use, heat generated by the heat source HS is transferred, via conduction, into the first body of high thermal conductivity material 14. In the embodiments where the high thermal conductivity material is a solid phase change material, this may result in melting of at least a portion of the first body of high thermal conductivity material 14, which absorbs some of the heat from the heat source and forms a conductive melted high thermal conductivity material layer 16 within the first body of high thermal conductivity material 14 and disposed in direct contact with the heat source HS (as shown in
[0036] The heat stored in the first body of high thermal conductivity material 14 and the heat stored in the conductive melted high thermal conductivity material layer 16, if present, may then be transferred by conduction and convection, respectively, to the thermally conductive housing 12. Heat transferred to the thermally conductive housing 12 may then be transferred by convection into the external environment, and by convection through the fins 22, if present, thereby cooling the heat sink 10. The vibrating base 20 may propagate oscillating waves through the thermally conductive housing 12, the first body of high thermal conductivity material 14, and/or the thermally conductive melted high thermal conductivity material layer 16, if present, to reach the direct contact interface 28, thereby increasing the rate of heat transfer from the heat source HS to the first body of high thermal conductivity material 14 and the conductive melted high thermal conductivity material layer 16, if present. Thus the heat from the heat source HS is quickly and efficiently transferred to the ambient environment.
[0037] In embodiments where the at least one high thermal conductivity material selected for the first body of high thermal conductivity material 14 is a solid phase change material, it may be desirable to avoid applying the oscillating waves until a sufficient portion of the first body of high thermal conductivity material 14 has melted. In this embodiment, the thermally conductive housing 12 may also have at least one sensor 50 attached to the at least one wall 32 of the thermally conductive housing 12 and the at least one sensor 50 may be positioned to detect melting of the first body of high thermal conductivity material 14 at the direct contact interface 28 (See
[0038] In the alternative embodiment of
[0039] The thermally conductive housing 112 may be selected from any suitable material that is compatible with the selected first body of high thermal conductivity material 114. For example, aluminum would not be used as a thermally conductive housing 112 material when the first body of high thermal conductivity material 114 includes elemental gallium. The at least one wall 132 of the thermally conductive housing 112 may have a plurality of fins 122 mounted to at least a portion thereof, outside of the first body of high thermal conductivity material 114. It should be understood that the positioning, overall configuration, relative dimensions, and number of thermally conductive fins 122 are shown for exemplary purposes only.
[0040] The first body of high thermal conductivity material 114 may comprise at least one high thermal conductivity material that may be liquid at intended operating conditions, or it may be a solid phase change material. The at least one high thermal conductivity material is selected such that it has a high thermal conductivity, and, if the high thermal conductivity material selected is a solid phase change material, is selected such that it has a melting point between the temperature of the external environment within which the heat sink 100 is intended to operate and the maximum operating temperature of the heat source HS. If the at least one high thermal conductivity material selected for the first body of high thermal conductivity material 114 is a phase change material, it may further be selected to have a phase change temperature at the target temperature or within the target operating temperature range to which the heat source HS is intended to be cooled. As a non-limiting example, if a heat sink 100 is intended to operate in a room maintained at 20 C. and to cool a heat source with a maximum operating temperature of 60 C., elemental gallium having a melting point of approximately 30 C. might be selected for the first body of high thermal conductivity material 114. Non-limiting examples of suitable high thermal conductivity materials for the first body of high thermal conductivity material 114 include one or more of elemental gallium, gallium alloys, paraffin with between eighteen and thirty carbons, sodium sulfate, lauric acid, trimethylolethane, p-lattic acid, methyl palmitate, camphenilone, caprylone, heptadecanone, 1-cyclohexyloctadecane, 4-heptadecanone, 3-heptadecanone, 2-heptadecanone, 9-heptadecanone, camphene, thymol, p-dichlorobenzene, heptaudecanoic acid, beeswax, glyolic acid, glycolic acid, capric acid, eladic acid, pentadecanoic acid, liquid gallium, and nano-fluids with high thermal conductivity nanoparticles.
[0041] In use, heat generated by the heat source HS is transferred, via conduction, into the first body of high thermal conductivity material 114. In embodiments where the high thermal conductivity material is a solid phase change material, this may result in melting of at least a portion of the first body of high thermal conductivity material 114, which absorbs some of the heat from the heat source HS and forms a conductive melted high thermal conductivity material layer 116 within the first body of high thermal conductivity material 114 and disposed in direct contact with the heat source HS (as shown in
[0042] The heat stored in the first body of high thermal conductivity material 114 and the heat stored in the conductive melted high thermal conductivity material layer 116, if present, may then be transferred by conduction and convection, respectively, to the thermally conductive housing 112. Heat transferred to the thermally conductive housing 112 may then be transferred by convection into the external environment, and by convection through the fins 122, if present, thereby cooling the heat sink 100. The vibrating base 120 may propagate oscillating waves through the thermally conductive housing 112, the first body of high thermal conductivity material 114, and/or the thermally conductive melted high thermal conductivity material layer 116, if present, to reach the direct contact interface 128, thereby increasing the rate of heat transfer from the heat source HS to the first body of high thermal conductivity material 114 and the conductive melted high thermal conductivity material layer 116, if present. Thus the heat from the heat source HS is quickly and efficiently transferred to the ambient environment.
[0043] In the alternative embodiment of
[0044] In embodiments where the at least one high thermal conductivity material selected for the first body of high thermal conductivity material 114 is a solid phase change material, it may be desirable to avoid applying the oscillating waves until a sufficient portion of the first body of high thermal conductivity material 114 has melted. In this embodiment, the thermally conductive housing 112 may also have at least one sensor 150 attached to the at least one wall 132 of the thermally conductive housing 112 and the at least one sensor 150 may be positioned to detect melting of the first body of high thermal conductivity material 114 at the direct contact interface 128 (See
[0045] In the alternative embodiment of
[0046] In the alternative embodiment of
[0047] The thermally conductive housing 212 may be selected from any suitable material that is compatible with the selected first body of high thermal conductivity material 214. For example, aluminum would not be used as a thermally conductive housing 212 material when the first body of high thermal conductivity material 214 includes elemental gallium. The at least one wall 232 of the thermally conductive housing 212 may have a plurality of fins 222 mounted to at least a portion thereof, outside of the first body of high thermal conductivity material 214. It should be understood that the positioning, overall configuration, relative dimensions, and number of thermally conductive fins 222 are shown for exemplary purposes only.
[0048] The first body of high thermal conductivity material 214 may comprise at least one high thermal conductivity material that may be liquid at intended operating conditions, or it may be a first solid phase change material. The at least one high thermal conductivity material being selected such that it has a high thermal conductivity and, if the high thermal conductivity material selected is a solid phase change material, is selected such that it has a melting point between the temperature of the external environment within which the heat sink 200 is intended to operate, and the maximum operating temperature of the heat source HS. If the at least one high thermal conductivity material selected for the first body of high thermal conductivity material 214 is a phase change material, it may further be selected to have a phase change temperature at the target temperature or within the target operating temperature range to which the heat source HS is intended to be cooled. As a non-limiting example, if the heat sink 200 is intended to operate in a room maintained at 20 C. and to cool a heat source with a maximum operating temperature of 60 C., elemental gallium having a melting point of approximately 30 C. might be selected for the first body of high thermal conductivity material 214. Non-limiting examples of suitable high thermal conductivity materials for the first body of high thermal conductivity material 214 include one or more of elemental gallium, gallium alloys, paraffin with between eighteen and thirty carbons, sodium sulfate, lauric acid, trimethylolethane, p-lattic acid, methyl palmitate, camphenilone, caprylone, heptadecanone, 1-cyclohexyloctadecane, 4-heptadecanone, 3-heptadecanone, 2-heptadecanone, 9-heptadecanone, camphene, thymol, p-dichlorobenzene, heptaudecanoic acid, beeswax, glyolic acid, glycolic acid, capric acid, eladic acid, pentadecanoic acid liquid gallium, and nano-fluids with high thermal conductivity nanoparticles.
[0049] The second body of high thermal conductivity material 215 may be formed from at least one second solid phase change material, the at least one second solid phase change material being selected such that it has a higher specific heat capacity than the specific heat capacity of the first body of high thermal conductivity material 214 and, if the first body of high thermal conductivity material 214 is a first solid phase change material, is selected such that it has a lower phase change temperature than the phase change temperature of the first body of high thermal conductivity material 214. Whether the first body of high thermal conductivity material 214 is formed from a liquid material or a phase change material, the second body of high thermal conductivity material 215 may be formed from a material selected such that in operation, the second body of high thermal conductivity material 215 maintains a lower temperature than the first body of high thermal conductivity material 214. Non-limiting examples of suitable solid phase change materials for the second body of high thermal conductivity material 215 include one or more of elemental gallium, gallium alloys, paraffin with between eighteen and thirty carbons, sodium sulfate, lauric acid, trimethylolethane, p-lattic acid, methyl palmitate, camphenilone, caprylone, heptadecanone, 1-cyclohexyloctadecane, 4-heptadecanone, 3-heptadecanone, 2-heptadecanone, 9-heptadecanone, camphene, thymol, p-dichlorobenzene, heptaudecanoic acid, beeswax, glyolic acid, glycolic acid, capric acid, eladic acid, and pentadecanoic acid. In an alternative embodiment, the second body of high thermal conductivity material 215 may be formed from encapsulated phase change material particles suspended in relevant high conductivity liquids.
[0050] In use, heat generated by the heat source HS is transferred by conduction into the first body of high thermal conductivity material 214. In the embodiments where the high thermal conductivity material is a solid phase change material, this may result in melting of at least a portion of the first body of high thermal conductivity material 214, which absorbs some of the heat from the heat source and forms a conductive melted high thermal conductivity material layer 216 within the first body of high thermal conductivity material 214 and disposed in direct contact with the heat source HS (as shown in
[0051] The heat stored in the first body of high thermal conductivity material 214 and the heat stored in the conductive melted high thermal conductivity material layer 216, if present, may then be transferred by conduction and convection, respectively, to the thermally conductive housing 212. Heat transferred to the thermally conductive housing 212 may then be transferred by convection into the external environment, and by convection through the fins 222, if present, thereby cooling the heat sink 200. The vibrating base 220 may propagate oscillating waves through the thermally conductive housing 212, the first body of high thermal conductivity material 214, the second body of high thermal conductivity material 215, and/or the thermally conductive melted high thermal conductivity material layer 216, if present, to reach the direct contact interface 228, thereby increasing the rate of heat transfer from the heat source HS to the first body of phase change material 214 and the conductive melted high thermal conductivity material layer 216, if present. Thus the heat from the heat source HS is quickly and efficiently transferred to the ambient environment.
[0052] In embodiments where the at least one high thermal conductivity material selected for the first body of high thermal conductivity material 214 is a solid phase change material, it may be desirable to avoid applying the oscillating waves until a sufficient portion of the first body of high thermal conductivity material 214 has melted. In these embodiment, the thermally conductive housing 212 may also have at least one sensor 250 attached to the at least one wall 32 of the thermally conductive housing 212 and the at least one sensor 250 may be positioned to detect melting of the first body of high thermal conductivity material 214 at the direct contact interface 228 (See
[0053] In the alternative embodiment of
[0054] As in previous embodiments, the thermally conductive housing 312 may be selected from any suitable material that is compatible with the selected first body of high thermal conductivity material 314. For example, aluminum would not be used as a thermally conductive housing 312 material when the first body of high thermal conductivity material 314 includes elemental gallium.
[0055] In the alternative embodiment of
[0056] The at least on high thermal conductivity material may be liquid at intended operating conditions, or it may be a solid phase change material. The at least one phase change material being selected such that it has a high thermal conductivity and, if the high thermal conductivity material selected is a solid phase change material, is selected such that it has a melting point between the temperature of the external environment within which the heat sink 300 is intended to operate and the maximum operating temperature of the heat source HS. If the at least one high thermal conductivity material selected for the first body of high thermal conductivity material 314 is a phase change material, it may further be selected to have a phase change temperature at the target temperature or within the target operating temperature range to which the heat source HS is intended to be cooled. As a non-limiting example, if a heat sink 300 is intended to operate in a room maintained at 20 C. and to cool a heat source with a maximum operating temperature of 60 C., elemental gallium having a melting point of approximately 30 C. might be selected for the first body of high thermal conductivity material 314. Non-limiting examples of suitable high thermal conductivity materials for the first body of high thermal conductivity material 314 include one or more of elemental gallium, gallium alloys, paraffin with between eighteen and thirty carbons, sodium sulfate, lauric acid, trimethylolethane, p-lattic acid, methyl palmitate, camphenilone, caprylone, heptadecanone, 1-cyclohexyloctadecane, 4-heptadecanone, 3-heptadecanone, 2-heptadecanone, 9-heptadecanone, camphene, thymol, p-dichlorobenzene, heptaudecanoic acid, beeswax, glyolic acid, glycolic acid, capric acid, eladic acid, pentadecanoic acid liquid gallium, and nano-fluids with high thermal conductivity nanoparticles.
[0057] As in previous embodiments, in use, heat generated by the heat source HS is transferred by conduction, into the first body of high thermal conductivity material 314. In the embodiments where the high thermal conductivity material is a solid phase change material, this may result in melting of at least a portion of the first body of high thermal conductivity material 314, which absorbs some of the heat from the heat source HS and forms a conductive melted high thermal conductivity material layer 316 within the first body of high thermal conductivity material 314 and disposed in direct contact with the heat source HS. Therefore, the conductive melted high thermal conductivity material layer 316 is typically a partially liquid form of the first body of high thermal conductivity material 314 (as shown in
[0058] The heat stored in the first body of high thermal conductivity material 314 and the heat stored in the conductive melted high thermal conductivity material layer 316, if present, may then be transferred by conduction and convection, respectively, to the thermally conductive housing 312. Heat transferred to the thermally conductive housing 312 may then be transferred by convection into the external environment, and by convection through the fins 322, if present, thereby cooling the heat sink 300. The vibrating base 320 may propagate oscillating waves through the thermally conductive housing 312, the first body of high thermal conductivity material 314, the at least one thermally conductive vertical stud 346, and/or the thermally conductive melted high thermal conductivity material layer 316, if present, to reach the direct contact interface 328, thereby increasing the rate of heat transfer from the heat source HS to the first body of phase change material 314 and the conductive melted high thermal conductivity material layer 316, if present.
[0059] In the alternative embodiment of
[0060] In embodiments where the at least one high thermal conductivity material selected for the first body of high thermal conductivity material 314 is a solid phase change material, it may be desirable to avoid applying the oscillating waves until a sufficient portion of the first body of high thermal conductivity material 314 has melted. In this embodiment, the thermally conductive housing 312 may also have at least one sensor 350 attached to the at least one wall 332 of the thermally conductive housing 312 and the at least one sensor 350 may be positioned to detect melting of the first body of high thermal conductivity material 314 at the direct contact interface 328 (See
[0061] In the alternative embodiment of
[0062] In the alternative embodiment of
[0063] Referring to the embodiment of
[0064] The thermally conductive housing 412 may be selected from any suitable material that is compatible with the selected first body of high thermal conductivity material 414. For example, aluminum would not be used as a thermally conductive housing 412 material when the first body of high thermal conductivity material 414 includes elemental gallium. The at least one wall 432 of the thermally conductive housing 412 may have a plurality of fins 422 mounted to at least a portion thereof, outside of the first body of high thermal conductivity material 414. It should be understood that the positioning, overall configuration, relative dimensions, and number of thermally conductive fins 422 are shown for exemplary purposes only.
[0065] The first body of high thermal conductivity material 414 may comprise at least one high thermal conductivity material that may be liquid at intended operating conditions, or it may be a solid phase change material. The at least one high thermal conductivity material is selected such that it has a high thermal conductivity and, if the high thermal conductivity material selected is a solid phase change material, is selected such that it has a melting point between the temperature of the external environment within which the heat sink 400 is intended to operate, and the maximum operating temperature of the heat source HS. If the at least one high thermal conductivity material selected for the first body of high thermal conductivity material 414 is a phase change material, it may further be selected to have a phase change temperature at the target temperature or within the target operating temperature range to which the heat source HS is intended to be cooled. As a non-limiting example, if a heat sink 400 is intended to operate in a room maintained at 20 C. and to cool a heat source with a maximum operating temperature of 60 C., elemental gallium having a melting point of approximately 30 C. might be selected for the first body of high thermal conductivity material 414. Non-limiting examples of suitable high thermal conductivity materials for the first body of high thermal conductivity material 414 include one or more of elemental gallium, gallium alloys, paraffin with between eighteen and thirty carbons, sodium sulfate, lauric acid, trimethylolethane, p-lattic acid, methyl palmitate, camphenilone, caprylone, heptadecanone, 1-cyclohexyloctadecane, 4-heptadecanone, 3-heptadecanone, 2-heptadecanone, 9-heptadecanone, camphene, thymol, p-dichlorobenzene, heptaudecanoic acid, beeswax, glyolic acid, glycolic acid, capric acid, eladic acid, pentadecanoic acid, liquid gallium, and nano-fluids with high thermal conductivity nanoparticles.
[0066] In use, heat generated by the heat source HS is transferred, via conduction, into the first body of high thermal conductivity material 414. In the embodiments where the high thermal conductivity material is a solid phase change material, this may result in melting of at least a portion of the first body of high thermal conductivity material 414, which absorbs some of the heat from the heat source and forms a conductive melted high thermal conductivity material layer 416 within the first body of high thermal conductivity material 414 and disposed in direct contact with the heat source HS (as shown in
[0067] The heat stored in the first body of high thermal conductivity material 414 and the heat stored in the conductive melted high thermal conductivity material layer 416, if present, may then be transferred by conduction and convection, respectively, to the thermally conductive housing 412. Heat transferred to the thermally conductive housing 412 may then be transferred by convection into the external environment, and by convection through the fins 422, if present, thereby cooling the heat sink 400. The vibrating base 420 may propagate oscillating waves through the supports 460 into the heat source HS, and from there into the first body of high thermal conductivity material 414 and/or the thermally conductive melted high thermal conductivity material layer 416, if present, to reach the direct contact interface 428, thereby increasing the rate of heat transfer from the heat source HS to the first body of high thermal conductivity material 414 and the thermally conductive melted high thermal conductivity material layer 416, if present. Thus the heat from the heat source HS is quickly and efficiently transferred to the ambient environment.
[0068] In embodiments where the at least one high thermal conductivity material selected for the first body of high thermal conductivity material 414 is a solid phase change material, it may be desirable to avoid applying the oscillating waves until a sufficient portion of the first body of high thermal conductivity material 414 has melted. In this embodiment, the thermally conductive housing 412 may also have at least one sensor 450 attached to the at least one wall 432 of the thermally conductive housing 412 and the at least one sensor 450 may be positioned to detect melting of the first body of high thermal conductivity material 414 at the direct contact interface 428 (See
[0069] Features of each of the disclosed embodiments may be used in other of the disclosed embodiments. For example, the tube of the embodiment of
[0070] It is to be understood that the heat sinks with vibration enhanced heat transfer for non-liquid heat sources are not limited to the specific embodiments described above, but encompasses any and all embodiments within the scope of the generic language of the following claims enabled by the embodiments described herein, or otherwise shown in the drawings or described above in terms sufficient to enable one of ordinary skill in the art to make and use the claimed subject matter.