微细管内压力功及粘性耗散对流动特性的影响

微细通道内的流动特性研究是一个新兴的研究领域，由于尺度微小，在常规尺度管流中被忽略的某些因素在微细通道中的作用将变得显著。因此，利用量级分析和数值计算的方法讨论了压力功及粘性耗散对微细管内可压缩流体绝热流动特性的影响，并得出以下结论： 对微细管道内的可压缩流体流动，压力功及粘性耗散已成为不可忽略的因素，它们的影响主要体现在使沿管程Ｍａ 增加趋缓及压降减小，但对流动阻力特性影响不大，局域Ｆａｎｎｉｎｇ 摩擦因数Ｃｆ与Ｒｅ的乘积不再是常数１６，而是局域Ｍａ 的函数，并随局域Ｍａ 的增加而增大

Effect of reversible work and viscous dissipation on gas flow characteristics in a microtube

Study of characteristics of microscale momentum transfer is becoming an important subject of recent investigation. Some factors neglected in macrotubes will play more prominent parts for fluid flow in microtubes due to smaller dimension. The method of order of magnitude estimate and numerical simulation was used to investigate the effect of reversible work and viscous dissipation on the adiabatic gas flow characteristics in a microtube. It is found that the reversible work and vicious dissipation slow down the increase of Ma and the pressure drop along the tube, but have little effect on the characteristics of frictional resistance. The product of local Fanning friction factor C f and Re for laminar gas flow in a microtube is no longer a constant of 16, but increases with increasing local Ma .