CAJ | 학술논문

在微通道二维简化模型下，通过改变粗糙元密度、形状及高度等参数，对空气在相对粗糙度影响下的流动换热特性进行了数值研究与分析。研究结果表明，由于回流区和障碍存在，压力降增加，平均泊肃叶数（Po数）增大。对于不可压缩情况，相对粗糙度的存在可能破坏了出口效应。与相对粗糙度对Po数的影响相比，相对粗糙度对努塞尔数（N u数）的影响较小。仿真结果可为微通道的相关设计提供依据。
재미통도이유간화모형하，통과개변조조원밀도、형상급고도등삼수，대공기재상대조조도영향하적류동환열특성진행료수치연구여분석。연구결과표명，유우회류구화장애존재，압력강증가，평균박숙협수（Po수）증대。대우불가압축정황，상대조조도적존재가능파배료출구효응。여상대조조도대Po수적영향상비，상대조조도대노새이수（N u수）적영향교소。방진결과가위미통도적상관설계제공의거。
A flow and heat transfer numerical simulation is performed for a 2D gaseous flow through microchannels to investigate the effects of relative roughness .These effects are simulated by various relative roughness .The numerical results demonstrate that recirculation zones and barriers lead to the pressure drop and average poiseuille number(Po number) in‐creasing .For incompressible cases ,the relative roughness'existence could undermine the export effect .Compared with the relative roughness effects on the Po numbers ,there are relatively less effects on the Nusselt numbers(Nu number) .The re‐sults can provide references to the microchannel design .