Fabrication of Porous Structures on the microchannel surfaces for enhanced microchannel heat sinks
Microchannel heat sinks have been widely used in cooling high power microelectronics,compact heat exchangers,chemical reactors and so on.Fabrication of porous structures on the micorchannel surfaces provides one effective means to enhance heat transfer,as it enlarges the heat transfer areas considerably.In the study,a laser micro-milling method is proposed to fabricate porous structures with micro-holes on the microchannel surfaces.Three different shapes of micro-channels,i.e.,U-shaped,V-shaped and rectangular ones,were utilized to process the porous structures,which demonstrated that porous structures can be formed on all the microchannels,and the crosss ectional shape of the microchannel is greatly affected by the laser micromilling,which caused that a thicker recast layer was deposited in the unscanned area.Besides,the effects of laser fluence on the formation of porous structures on the rectangular microchannels were also explored.The surface morphology of these porous structures was analyzed based on the SEM observations together with the metal removing mechanisms.It was found that laser fluence played a vital role on the formation of porous structures,and surface roughness of porous copper surfaces increased with increasing the laser fluence.
Microchannel heat sinks porous structures laser micro-milling surface roughness
Chen Xiaolong Deng Daxiang Xie Yanlin Huang Qingsong
Department of Mechanical & Electrical Engineering,Xiamen University,Xiamen,361005,China
国际会议
第十七届国际制造会议(The 17th International Manufacturing Conference in China)(IMCC 2017))
深圳
英文
1-7
2017-11-23（万方平台首次上网日期，不代表论文的发表时间）