EXPERIMENTAL RESEARCH ON HEAT TRANSFER PERFORMANCE OF DIRECTIOANLLY SOLIDIFIED POROUS COPPER HEAT SINK
EXPERIMENTAL RESEARCH ON HEAT TRANSFER PERFORMANCE OF DIRECTIOANLLY SOLIDIFIED POROUS COPPER HEAT SINK
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DOI：
10.3724/sp.j.1037.2011.00703
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发表时间：
2012-03
影响因子：
2.3
通讯作者：
Chen Liu-Shou;Zhang Huawei;Liu Yuan;Li Yanxiang
中科院分区：
文献类型：
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作者：
Chen Liu-Shou;Zhang Huawei;Liu Yuan;Li Yanxiang
采用金属-气体共晶体系定向凝固法制备了可用于制作特殊微通道散热器的长圆柱孔多孔铜散热器。研究了沿气孔轴向长度为20 mm的定向凝固多孔铜散热器的换热性能。实验结果表明，定向凝固多孔铜散热器具有良好的换热性能，当孔隙率为29%，平均孔径为400μm时，换热系数可达5W/(cm2·K)。将多孔铜沿孔轴垂直方向切割成沿孔轴方向排列的两段后，换热系数较大，为6.5W/(cm2.K)，沿孔轴方向增加多孔铜热沉的长度会降低气孔的穿透率，从而削弱热沉的换热性能。因此，在制备定向凝固多孔铜热沉时，必须采取一些措施来增加孔长和穿孔率。
Porous copper with long cylindrical pores has been fabricated by unidirectional solidification of metal-gas eutectic system,which can be used to manufacture a special kind of micro-channel heat sink.The heat transfer performance of the directionally solidified porous copper heat sink with a length of 20 mm along the axial direction of pores was studied.The experimental results show that the directionally solidified porous copper heat sink has excellent heat transfer performance and a heat transfer coefficient of 5 W/(cm~2·K) is attainable when a porosity is 29%and mean pore diameter is 400μm,and it shows a larger heat transfer coefficient of 6.5 W/(cm~2·K) after cutting the porous copper along the vertical direction of pore axis into two sections alined in the direction of pore axis.Increasing the length of porous copper heat sink along the direction of pore axis will reduce the penetration ratio of pores and then weaken the heat transfer performance of the heat sink.Thus some methods have to be taken to increase the pore length and ratio of penetrating pores when fabricating directionally solidified porous copper heat sink.