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将Cantor集分形引入到微通道粗糙表面形貌的构建中,建立了粗糙微通道内气体流动的理论模型,采用格子Boltzmann方法模拟研究了表面粗糙对微尺度气体流动的影响,比较了粗糙和光滑微通道内气体流动特性.研究结果表明,气体的稀薄程度对微通道内气体流动特性有重要影响.无论通道是否光滑,随着Knudsen数的增加,微通道内气体流动Poiseuille数都将随之减小,但粗糙微通道中气动Poiseuille数大于光滑微通道.另外,粗糙微通道内的气体流动Poiseuille数受统计粗糙高度变化的影响较大,受分形维数变化的影响则较弱.

参考文献

[1] Bing-Yang Cao;Min Chen;Zeng-Yuan Guo .Effect of surface roughness on gas flow in microchannels by molecular dynamics simulation[J].International Journal of Engineering Science,2006(13/14):927-937.
[2] Warren TL.;Krajcinovic D. .FRACTAL MODELS OF ELASTIC PERFECTLY PLASTIC CONTACT OF ROUGH SURFACES BASED ON THE CANTOR SET[J].International Journal of Solids and Structures,1995(19):2907-2922.
[3] Yongping Chen;Chengbin Zhang;Panpan Fu;Mingheng Shi .Characterization of Surface Roughness Effects on Laminar Flow in Microchannels by Using Fractal Cantor Structures[J].Journal of heat transfer: Transactions of the ASME,2012(5):051011-1-051011-7.
[4] Numerical simulation of laminar heat transfer in microchannels with rough surfaces characterized by fractal Cantor structures[J].International journal of heat and fluid flow,2010(4):P.622.
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