Abstract
A special kind of microchannel heat sink is fabricated by a lotus-type porous copper in which long cylindrical pores are arranged in one direction. By applying the straight fin model to the lotus-type porous copper, the effect of the pore structure including porosity, pore diameter and open porosity on its heat transfer performance can be predicted. Given an available pump pressure, the structural parameter window of lotus-type porous copper which meets the heat dissipation requirement can be given. By improving the process control pore structure can be optimized and 80% pores in optimized lotus-type porous copper samples are open when the sample length along the pore growth direction is 16 mm. The heat transfer performance of optimized lotus-type porous copper heat sinks was tested. At a pressure drop of 100 kPa, a heat transfer coefficient of 7.86 (W/cm2 K) could be achieved.
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