Experimental study on heat transfer performance of lotus-type porous copper heat sink
A special kind of micro-channel heat sink was made by using lotus-type porous (also named Gasar) metals with long cylindrical pores formed during unidirectional solidification of metal–gas eutectic system. Copper was selected as the matrix metal because of its high heat conductivity. The heat transf...
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Published in | International journal of heat and mass transfer Vol. 56; no. 1-2; pp. 172 - 180 |
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Format | Journal Article |
Language | English |
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01.01.2013
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Abstract | A special kind of micro-channel heat sink was made by using lotus-type porous (also named Gasar) metals with long cylindrical pores formed during unidirectional solidification of metal–gas eutectic system. Copper was selected as the matrix metal because of its high heat conductivity. The heat transfer performance of lotus-type porous copper heat sink with a length of 20mm along the axial direction of pores was studied on a testing platform designed and set up in this paper. The experimental results show that the lotus-type porous copper heat sink cooled by water has excellent heat transfer performance and a heat transfer coefficient of 5W/(cm2K) is attainable when the porosity is 29% and mean pore diameter is 400μm. An even larger heat transfer coefficient of 9W/(cm2K) can be reached after simply cutting the porous copper along the vertical direction of pore axis into four or eight equal sections alined in the direction of pore axis, because that reducing the length of porous copper heat sink along the direction of pore axis will increase the penetrative porosity, result in increase of flow rate, and then enhance the heat transfer performance of the heat sink. Thus some methods have to be taken to increase the pore length and penetrative porosity when fabricating lotus-type porous copper heat sink. |
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AbstractList | A special kind of micro-channel heat sink was made by using lotus-type porous (also named Gasar) metals with long cylindrical pores formed during unidirectional solidification of metal–gas eutectic system. Copper was selected as the matrix metal because of its high heat conductivity. The heat transfer performance of lotus-type porous copper heat sink with a length of 20mm along the axial direction of pores was studied on a testing platform designed and set up in this paper. The experimental results show that the lotus-type porous copper heat sink cooled by water has excellent heat transfer performance and a heat transfer coefficient of 5W/(cm2K) is attainable when the porosity is 29% and mean pore diameter is 400μm. An even larger heat transfer coefficient of 9W/(cm2K) can be reached after simply cutting the porous copper along the vertical direction of pore axis into four or eight equal sections alined in the direction of pore axis, because that reducing the length of porous copper heat sink along the direction of pore axis will increase the penetrative porosity, result in increase of flow rate, and then enhance the heat transfer performance of the heat sink. Thus some methods have to be taken to increase the pore length and penetrative porosity when fabricating lotus-type porous copper heat sink. |
Author | Liu, Yuan Li, Yanxiang Zhang, Huawei Chen, Liutao |
Author_xml | – sequence: 1 givenname: Huawei surname: Zhang fullname: Zhang, Huawei organization: Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, PR China – sequence: 2 givenname: Liutao surname: Chen fullname: Chen, Liutao organization: Department of Mechanical Engineering, Tsinghua University, Beijing 100084, PR China – sequence: 3 givenname: Yuan surname: Liu fullname: Liu, Yuan organization: Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, PR China – sequence: 4 givenname: Yanxiang surname: Li fullname: Li, Yanxiang email: yanxiang@tsinghua.edu.cn organization: Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, PR China |
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Title | Experimental study on heat transfer performance of lotus-type porous copper heat sink |
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