End effects on electro-osmotic flows in micro-channels

Ruey-Jen Yang, T. I. Tseng, C. C. Chang

研究成果: Article同行評審

24 引文 斯高帕斯(Scopus)


Although the micro-channels of typical lab-on-a-chip micro-fluidic devices are connected to reservoirs, existing analyses of the flow physics within the micro-channels frequently ignore the end effects induced by these reservoirs. Accordingly, this study presents an analytical and numerical investigation into electro-osmotic flow (EOF) which takes into account the end effects associated with the inlets and outlets of the micro-channels. The results indicate that the EOF contractions and expansions which occur in the inlet and outlet regions, respectively, induce streamwise pressure gradients, which result in non-flat EOF velocity profiles within the micro-channel. Furthermore, it is proven theoretically that this pressure gradient eventually vanishes once the micro-channel becomes sufficiently long that the end effects no longer exert an influence on the flow. An empirical relation between the entrance length and Reynolds number is established via parametric studies.

頁(從 - 到)254-262
期刊Journal of Micromechanics and Microengineering
出版狀態Published - 2005 二月 1

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 材料力學
  • 機械工業
  • 電氣與電子工程


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