US20060283575A1 - Heat pipe - Google Patents
Heat pipe Download PDFInfo
- Publication number
- US20060283575A1 US20060283575A1 US11/184,813 US18481305A US2006283575A1 US 20060283575 A1 US20060283575 A1 US 20060283575A1 US 18481305 A US18481305 A US 18481305A US 2006283575 A1 US2006283575 A1 US 2006283575A1
- Authority
- US
- United States
- Prior art keywords
- wick
- heat pipe
- casing
- porosity
- working fluid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
- F28D15/04—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes with tubes having a capillary structure
- F28D15/046—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes with tubes having a capillary structure characterised by the material or the construction of the capillary structure
Definitions
- the present invention relates generally to heat transferring devices and more particularly, to a high-performance heat pipe of which the wick has different porosities at different parts for different functions.
- a conventional heat pipe generally comprises a hollow metal tube, which has the both ends closed, a working fluid, for example, pure water filled in the metal tube, and a wick formed of copper powder on the inside wall of the metal tube by sintering.
- the wick has pores for absorbing the working fluid.
- the wick of a heat pipe is made having a uniform porosity.
- the porosity has a great concern with the performance of the heat pipe.
- a wick having a relatively lower porosity provides a relatively better capillary effect, however its flow path function for carrying the working fluid is relatively poorer.
- a wick having a relatively higher porosity provides a relatively better flow patch function for carrying the working fluid, however its capillary effect is relatively weaker. Therefore, it is an important work how to maintain the capillary effect of the wick while improving the flow path function for carrying the working fluid.
- the present invention has been accomplished under the circumstances in view. It is the main object of the present invention to a high-performance heat pipe, which uses a wick that provides a satisfactory capillary effect and flow path function for carrying the working fluid.
- the wick of the heat pipe has at least two different porosities to provide a satisfactory capillary effect and flow path function for carrying the working fluid, thereby improving the thermal transfer performance of the heat pipe.
- the wick has axially divided multiple parts that have different porosities. In another embodiment of the present invention, the wick has radially divided multiple parts that have different porosities. Preferably, the wick has two parts, namely, the first part that has a porosity within about 55%-60%, and the second part that has a porosity within about 65%-80%.
- FIG. I is a schematic sectional view of a heat pipe according to the present invention.
- FIG. 2 is a schematic sectional view of an alternate form of the heat pipe according to the present invention.
- FIG. 3 is a schematic sectional view of another alternate form of the heat pipe according to the present invention.
- FIG. 4 is a sectional view taken along line 4 - 4 of FIG. 3 .
- a heat pipe in accordance with the present invention comprising a casing 10 , a working fluid 20 , and a wick 30 .
- the casing 10 is a metal tube having the both ends closed and defining therein an enclosed chamber 11 .
- the working fluid 20 is disposed in the enclosed chamber 11 .
- the working fluid 20 is pure water. Other fluids may be selectively used as a substitute.
- the casing 10 has a heating end 12 and a cooling end 14 .
- the wick 20 is formed of copper powder on the inside wall of the casing 10 by sintering, having axially divided three parts, namely, the first part 32 , the second part 34 , and the third part 36 . These three parts 32 , 34 and 36 have different porosities.
- the porosity of the first part 32 of the wick is 55%.
- the porosity of the second part 34 of the wick is 80%.
- the porosity of the third part 36 of the wick is 60%.
- the heating end 12 of the casing 10 touched a heat source
- the working fluid 20 is vaporized, and produced steam flows along the chamber 11 to the cooling end 14 where steam is condensed into liquid.
- the third part 36 provides a better capillary effect to absorb the working fluid 20 around the cooling end.
- the second part 34 provides a better flow path function to reduce the resistance to the reverse flowing of the working fluid 20 .
- the first part 36 also provides a better capillary effect to absorb the working fluid 20 from the second part 34 to the heating end 12 .
- the wick 30 provides a better flowing path function and a satisfactory capillary effect, achieving a high performance in heat transfer.
- alloy powder of copper and silver or other suitable materials may be selectively used for sintering into the desired wick 30 instead of copper powder.
- a porosity ranging from 55%-60% provides a better capillary effect.
- a porosity ranging from 65%-80% provides a better flow path function.
- the porosity of each part of the wick 30 may be changed subject to actual requirements, and each part may be made having different porosities gradually increased from one end to the other.
- FIG. 2 shows an alternate form of the heat pipe according to the present invention.
- the heat pipe comprises a casing 10 , a working fluid 20 , and a wick 30 .
- the wick 30 is axially divided into a first part 32 and a second part 34 .
- the porosity of the first part 32 is 75%.
- the porosity of the second part 34 is 55%.
- FIGS. 3 and 4 show another alternate form of the heat pipe according to the present invention.
- the heat pipe comprises a casing 10 , a working fluid 20 , and a wick 30 .
- the wick 30 is radially divided into a first part 32 and a second part 34 .
- the first part 32 is disposed at an outer side and bonded to the inside wall of the casing 10 .
- the porosity of the first part 32 is 70%.
- the second part 34 is disposed at an inner side and bonded to the first part 32 .
- the porosity of the second part 34 is 58%.
- the second part 34 provides a better capillary effect to absorb the working fluid 20 .
- the first part 32 provides a better flow path function to reduce the resistance to the reverse flowing of the working fluid 20 . Therefore, the heat pipe provides a better flowing path function and a satisfactory capillary effect, achieving a high performance in heat transfer.
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
- Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)
- Cooling Or The Like Of Electrical Apparatus (AREA)
Abstract
A heat pipe includes a hollow elongated casing, which defines therein an enclosed chamber, a working fluid filled in the enclosed chamber; and a wick, which is formed on the inside wall of the casing around the enclosed fluid chamber and has two parts that have different porosities.
Description
- 1. Field of the Invention
- The present invention relates generally to heat transferring devices and more particularly, to a high-performance heat pipe of which the wick has different porosities at different parts for different functions.
- 2. Description of the Related Art
- A conventional heat pipe generally comprises a hollow metal tube, which has the both ends closed, a working fluid, for example, pure water filled in the metal tube, and a wick formed of copper powder on the inside wall of the metal tube by sintering. The wick has pores for absorbing the working fluid.
- When one end of the heat pipe touched a heat source, the pure water at the heating end is vaporized, and produced steam is quickly dissipated to the other end, namely, the cold end where steam is condensed into water to release latent heat. At this time, condensed water flows back to the heating end through the pores in the wick, completing one thermal cycle. By means of the alternation of the working fluid between the liquid phase and the gas phase, the heat pipe transfers a big amount of heat energy.
- To facilitate fabrication, the wick of a heat pipe is made having a uniform porosity. However, the porosity has a great concern with the performance of the heat pipe. A wick having a relatively lower porosity provides a relatively better capillary effect, however its flow path function for carrying the working fluid is relatively poorer. On the contrary, a wick having a relatively higher porosity provides a relatively better flow patch function for carrying the working fluid, however its capillary effect is relatively weaker. Therefore, it is an important work how to maintain the capillary effect of the wick while improving the flow path function for carrying the working fluid.
- The present invention has been accomplished under the circumstances in view. It is the main object of the present invention to a high-performance heat pipe, which uses a wick that provides a satisfactory capillary effect and flow path function for carrying the working fluid.
- To achieve this and other objects of the present invention, the wick of the heat pipe has at least two different porosities to provide a satisfactory capillary effect and flow path function for carrying the working fluid, thereby improving the thermal transfer performance of the heat pipe.
- In one embodiment of the present invention, the wick has axially divided multiple parts that have different porosities. In another embodiment of the present invention, the wick has radially divided multiple parts that have different porosities. Preferably, the wick has two parts, namely, the first part that has a porosity within about 55%-60%, and the second part that has a porosity within about 65%-80%.
- FIG. I is a schematic sectional view of a heat pipe according to the present invention.
-
FIG. 2 is a schematic sectional view of an alternate form of the heat pipe according to the present invention. -
FIG. 3 is a schematic sectional view of another alternate form of the heat pipe according to the present invention. -
FIG. 4 is a sectional view taken along line 4-4 ofFIG. 3 . - Referring to
FIG. 1 , a heat pipe in accordance with the present invention is shown comprising acasing 10, a workingfluid 20, and awick 30. - The
casing 10 is a metal tube having the both ends closed and defining therein an enclosedchamber 11. The workingfluid 20 is disposed in the enclosedchamber 11. According to this embodiment, the workingfluid 20 is pure water. Other fluids may be selectively used as a substitute. Further, thecasing 10 has aheating end 12 and acooling end 14. - The
wick 20 is formed of copper powder on the inside wall of thecasing 10 by sintering, having axially divided three parts, namely, thefirst part 32, thesecond part 34, and thethird part 36. These threeparts first part 32 of the wick is 55%. The porosity of thesecond part 34 of the wick is 80%. The porosity of thethird part 36 of the wick is 60%. - When the
heating end 12 of thecasing 10 touched a heat source, the workingfluid 20 is vaporized, and produced steam flows along thechamber 11 to thecooling end 14 where steam is condensed into liquid. At this time, thethird part 36 provides a better capillary effect to absorb the workingfluid 20 around the cooling end. When the workingfluid 20 is returning to theheating end 12, and thesecond part 34 provides a better flow path function to reduce the resistance to the reverse flowing of the workingfluid 20. Further, thefirst part 36 also provides a better capillary effect to absorb the workingfluid 20 from thesecond part 34 to theheating end 12. - Because the first, second and
third parts wick 30 have different porosities, thewick 30 provides a better flowing path function and a satisfactory capillary effect, achieving a high performance in heat transfer. - Further, alloy powder of copper and silver or other suitable materials may be selectively used for sintering into the desired
wick 30 instead of copper powder. A porosity ranging from 55%-60% provides a better capillary effect. A porosity ranging from 65%-80% provides a better flow path function. In actual fabrication, the porosity of each part of thewick 30 may be changed subject to actual requirements, and each part may be made having different porosities gradually increased from one end to the other. -
FIG. 2 shows an alternate form of the heat pipe according to the present invention. According to this embodiment, the heat pipe comprises acasing 10, a workingfluid 20, and awick 30. Thewick 30 is axially divided into afirst part 32 and asecond part 34. The porosity of thefirst part 32 is 75%. The porosity of thesecond part 34 is 55%. By means of this design, thesecond part 34 provides a better capillary effect, and thefirst part 32 provides a better flow path function. -
FIGS. 3 and 4 show another alternate form of the heat pipe according to the present invention. According to this embodiment, the heat pipe comprises acasing 10, a workingfluid 20, and awick 30. Thewick 30 is radially divided into afirst part 32 and asecond part 34. Thefirst part 32 is disposed at an outer side and bonded to the inside wall of thecasing 10. The porosity of thefirst part 32 is 70%. Thesecond part 34 is disposed at an inner side and bonded to thefirst part 32. The porosity of thesecond part 34 is 58%. Thesecond part 34 provides a better capillary effect to absorb the workingfluid 20. Thefirst part 32 provides a better flow path function to reduce the resistance to the reverse flowing of the workingfluid 20. Therefore, the heat pipe provides a better flowing path function and a satisfactory capillary effect, achieving a high performance in heat transfer. - Although particular embodiments of the invention have been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the invention. Accordingly, the invention is not to be limited except as by the appended claims.
Claims (7)
1. A heat pipe comprising:
a hollow elongated casing, said casing defining therein an enclosed chamber;
a working fluid disposed in said enclosed chamber; and
a wick formed on an inside wall of said casing;
wherein said wick has a first part and a second part, said first part and said second part have different porosities.
2. The heat pipe as claimed in claim 1 , wherein said first part of the wick has a porosity within 55%-60%; said second part of the wick has a porosity within 65%-80%.
3. The heat pipe as claimed in claim 2 , wherein said casing has a heating end and a cooling end opposite said heating end; said first part of the wick is located at said heating end, and said second part is located at said cooling end.
4. The heat pipe as claimed in claim 2 , wherein said casing has a heating end and a cooling end opposite to said heating end; said wick further has a third part, said third part having a porosity within about 55%-60%, said first part of the wick being disposed at said heating end, said third part of the wick being disposed at said cooling end, said second part of the wick being located between said first part and said third part of the wick.
5. The heat pipe as claimed in claim 1 , wherein said wick is sintered from copper powder or alloy powder of copper and silver.
6. The heat pipe as claimed in claim 1 , wherein said first part and said second part of the wick are axially arranged in a line.
7. The heat pipe as claimed in claim 1 , wherein said first part of the wick is bonded to the inside wall of said casing, and said second part of the wick is bonded to said first part of the wick.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW094120074A TW200700686A (en) | 2005-06-16 | 2005-06-16 | Heat pipe |
TW94120074 | 2005-06-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20060283575A1 true US20060283575A1 (en) | 2006-12-21 |
Family
ID=37572205
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/184,813 Abandoned US20060283575A1 (en) | 2005-06-16 | 2005-07-20 | Heat pipe |
Country Status (2)
Country | Link |
---|---|
US (1) | US20060283575A1 (en) |
TW (1) | TW200700686A (en) |
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070246194A1 (en) * | 2006-04-21 | 2007-10-25 | Foxconn Technology Co., Ltd. | Heat pipe with composite capillary wick structure |
US20070251673A1 (en) * | 2006-04-28 | 2007-11-01 | Foxconn Technology Co., Ltd. | Heat pipe with non-metallic type wick structure |
US20070267178A1 (en) * | 2006-05-19 | 2007-11-22 | Foxconn Technology Co., Ltd. | Heat pipe |
US20090166005A1 (en) * | 2007-12-29 | 2009-07-02 | Fu Zhun Precision Industry (Shen Zhen) Co., Ltd. | Vapor chamber |
US20100236761A1 (en) * | 2009-03-19 | 2010-09-23 | Acbel Polytech Inc. | Liquid cooled heat sink for multiple separated heat generating devices |
US20100263835A1 (en) * | 2009-04-17 | 2010-10-21 | Young Green Energy Co. | Heat pipe |
US20100294475A1 (en) * | 2009-05-22 | 2010-11-25 | General Electric Company | High performance heat transfer device, methods of manufacture thereof and articles comprising the same |
US20110108142A1 (en) * | 2009-11-10 | 2011-05-12 | Juei-Khai Liu | Vapor chamber and manufacturing method thereof |
US20110174474A1 (en) * | 2010-01-20 | 2011-07-21 | Juei-Khai Liu | Vapor chamber and method for manufacturing the same |
US20110296811A1 (en) * | 2010-06-03 | 2011-12-08 | Rolls-Royce Plc | Heat transfer arrangement for fluid-washed surfaces |
US20120227933A1 (en) * | 2011-03-10 | 2012-09-13 | Cooler Master Co., Ltd. | Flat heat pipe with sectional differences and method for manufacturing the same |
WO2020018484A1 (en) * | 2018-07-18 | 2020-01-23 | Thermal Corp. | Heat pipes having wick structures with variable permeability |
US20220128312A1 (en) * | 2011-05-24 | 2022-04-28 | Aavid Thermal Corp. | Capillary device for use in heat pipe and method of manufacturing such capillary device |
US20220341681A1 (en) * | 2017-04-12 | 2022-10-27 | Furukawa Electric Co., Ltd. | Heat pipe |
US20230065452A1 (en) * | 2021-08-19 | 2023-03-02 | Lenovo (Beijing) Limited | Heat dissipation member and electronic apparatus |
US20240009869A1 (en) * | 2021-09-13 | 2024-01-11 | Jiangsu University | Bionic sweat gland and bionic skin |
-
2005
- 2005-06-16 TW TW094120074A patent/TW200700686A/en unknown
- 2005-07-20 US US11/184,813 patent/US20060283575A1/en not_active Abandoned
Cited By (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070246194A1 (en) * | 2006-04-21 | 2007-10-25 | Foxconn Technology Co., Ltd. | Heat pipe with composite capillary wick structure |
US20070251673A1 (en) * | 2006-04-28 | 2007-11-01 | Foxconn Technology Co., Ltd. | Heat pipe with non-metallic type wick structure |
US20070267178A1 (en) * | 2006-05-19 | 2007-11-22 | Foxconn Technology Co., Ltd. | Heat pipe |
US20090166005A1 (en) * | 2007-12-29 | 2009-07-02 | Fu Zhun Precision Industry (Shen Zhen) Co., Ltd. | Vapor chamber |
US20100236761A1 (en) * | 2009-03-19 | 2010-09-23 | Acbel Polytech Inc. | Liquid cooled heat sink for multiple separated heat generating devices |
US20100263835A1 (en) * | 2009-04-17 | 2010-10-21 | Young Green Energy Co. | Heat pipe |
US20100294475A1 (en) * | 2009-05-22 | 2010-11-25 | General Electric Company | High performance heat transfer device, methods of manufacture thereof and articles comprising the same |
EP2253919A3 (en) * | 2009-05-22 | 2013-11-06 | General Electric Company | High Performance Heat Transfer Device, Methods Of Manufacture Thereof And Articles Comprising The Same |
US20110108142A1 (en) * | 2009-11-10 | 2011-05-12 | Juei-Khai Liu | Vapor chamber and manufacturing method thereof |
US20110174474A1 (en) * | 2010-01-20 | 2011-07-21 | Juei-Khai Liu | Vapor chamber and method for manufacturing the same |
US8671570B2 (en) * | 2010-01-20 | 2014-03-18 | Pegatron Corporation | Vapor chamber and method for manufacturing the same |
US20110296811A1 (en) * | 2010-06-03 | 2011-12-08 | Rolls-Royce Plc | Heat transfer arrangement for fluid-washed surfaces |
US8915058B2 (en) * | 2010-06-03 | 2014-12-23 | Rolls-Royce Plc | Heat transfer arrangement for fluid-washed surfaces |
US20120227933A1 (en) * | 2011-03-10 | 2012-09-13 | Cooler Master Co., Ltd. | Flat heat pipe with sectional differences and method for manufacturing the same |
US20220128312A1 (en) * | 2011-05-24 | 2022-04-28 | Aavid Thermal Corp. | Capillary device for use in heat pipe and method of manufacturing such capillary device |
US20220341681A1 (en) * | 2017-04-12 | 2022-10-27 | Furukawa Electric Co., Ltd. | Heat pipe |
US11828539B2 (en) * | 2017-04-12 | 2023-11-28 | Furukawa Electric Co., Ltd. | Heat pipe |
WO2020018484A1 (en) * | 2018-07-18 | 2020-01-23 | Thermal Corp. | Heat pipes having wick structures with variable permeability |
US11480394B2 (en) * | 2018-07-18 | 2022-10-25 | Aavid Thermal Corp. | Heat pipes having wick structures with variable permeability |
US20230087840A1 (en) * | 2018-07-18 | 2023-03-23 | Aavid Thermal Corp. | Heat pipes having wick structures with variable permeability |
US20230065452A1 (en) * | 2021-08-19 | 2023-03-02 | Lenovo (Beijing) Limited | Heat dissipation member and electronic apparatus |
US20240009869A1 (en) * | 2021-09-13 | 2024-01-11 | Jiangsu University | Bionic sweat gland and bionic skin |
Also Published As
Publication number | Publication date |
---|---|
TW200700686A (en) | 2007-01-01 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: YUH-CHENG CHEMICAL LTD., TAIWAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:PAI, JENG-MING;REEL/FRAME:016727/0314 Effective date: 20050712 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |