文章基本信息

标题：On Laminar Flow in Microfabricated Channels with Partial Semi-Circular Profiles
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作者：William J. Federspiel ; Isabella Valenti
期刊名称：Open Journal of Applied Sciences
印刷版ISSN：2165-3917
电子版ISSN：2165-3925
出版年度：2012
卷号：2
期号：1
页码：28-34
DOI：10.4236/ojapps.2012.21003
出版社：Scientific Research Publishing
摘要：Soft and hard micromachining techniques used to develop microfluidic devices can yield microchannels of many different cross-sectional profiles. For semi-circular microchannels, these techniques often produce only partialsemicircular (PSC) cross-sections. This study investigated fully developed laminar flow in PSC microchannels as a function of a circularity index, κ, defined as the ratio of the radiuses along the curved and flat surfaces of the PSC profile. A correction factor, K, to the Hagen-Poiseuille relation was determined and was well-fitted by the power-law relationship K=5.299/κ^2.56. Actual correction factors were compared to estimates based on several hydraulic models for flow in microchannels of arbitrary cross-section, as well as the half-ellipsoid cross-section. The level of wall shear stress, when normalized by the pressure drop per unit length, increased approximately linearly with increase in the circularity index, κ.
关键词：Hagen-Poiseuille Flow; Poiseuille Flow; Flow Resistance; Wall Shear Stress