Dispersion due to electroosmotic flow in a circular microchannel with slowly varying wall potential and hydrodynamic slippage
An analysis using the lubrication approximation is performed for the dispersion of a neutral non-reacting solute due to electroosmotic flow through a circular channel under the combined effects of longitudinal non-uniformity of potential and hydrodynamic slippage on the channel wall.The wall is periodically patterned for the charge and slip distributions, with a wavelength much longer than the channel radius.It is shown that the presence of slip can greatly amplify the increased dispersion caused by induced pressure gradient brought about by the non-uniformity of wall potential.Non-uniform wall potential interacting with non-uniform slip can give rise to effects much different from those when the potential and slip are both uniformly distributed and equal to the averages of the non-uniform distributions.
microchannel electroosmotic flow hydrodynamic dispersion boundary slip lubrication approximation
NG Chiu-On ZHOU Qi
Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, China
国内会议
第十一届全国水动力学学术会议暨第二十四届全国水动力学研讨会并周培源诞辰110周年纪念大会
无锡
英文
68-77
2012-08-25（万方平台首次上网日期，不代表论文的发表时间）