摘要
对氮气和氦气在粗糙微通道以及光滑微通道内流动进行了阻力特性实验研究。实验结果表明,即使在较小的相对粗糙度高度下,由于微通道中的粗糙度分布密集,会极大地增加流动阻力,这是导致文献中微通道流动阻力系数实验值相互偏差的主要原因之一;而对于滑移区的气体流动,气体稀薄性使流动阻力明显减小而导致流量增加。
Experiments are conducted for nitrogen and helium gaseous flow through rough and smooth microchannels. The experimental results show that the surface roughness increases the flow resistance significantly even though the relative height is rather small. This is one of the major factors which causes the disagreements on the friction factor of microchannel flow in the literature; for the gaseous flow in the slip regime, an evident lower flow resistance is observed due to the gas rarefaction effect which causes the mass flow rate increase compared with the continuum flow.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2006年第2期304-306,共3页
Journal of Engineering Thermophysics
基金
国家自然科学基金项目资助(No.50406020
No.50425620)
关键词
微通道
滑移区
流动阻力
实验研究
粗糙度
microchannel flow
slip regime
flow resistance
experimental study
roughness
