摘要
通过结合实验数据的数值计算方法研究了微细管道内可压流动的流动特性,提出了改进的表面粗糙度粘性系数模型,将表面粗糙度的影响引入计算模型中,计算结果与实验数据符合较好,说明表面粗糙度是影响微细管道内气体流动特性的重要因素。扩张管的计算结果表明在Re>450时,流动开始由层流向湍流转捩。因此微细管内流动的数值模拟需综合考虑粗糙度的影响以及流动的提前转捩,才能得到与实验比较吻合的计算值。
Experimental data and numerical simulations were combined to investigate the flow characteristics of compressible flow through microchannels. An improved surface roughness viscosity model more effectively simulated the effect of surface roughness on the microchannel flow characteristics. The results indicate that surface roughness is an important factor affecting the flow characteristics of gas flow through microchannels. A numerical investigation of flow in an expansion channel shows that results with the laminar flow model with consideration of surface roughness agree with experimental data for Re<450. A model incorporating early transition and surface roughness is in good agreement with experimental data for Re>450 with turbulant flow.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2003年第5期686-689,共4页
Journal of Tsinghua University(Science and Technology)
基金
国家自然科学基金资助项目(10272066)
教育部留学回国人员基金资助项目
国家教育振兴计划资助项目
