Flow characteristics and mixing performance of electrokinetically driven non-Newtonian fluid in contraction–expansion microchannel

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• 作者：Ching-Chang Cho (1) cccho@mail.ncku.edu.tw
  Chieh-Li Chen (2) chiehli@mail.ncku.edu.tw
  Cha’o-Kuang Chen (1) ckchen@mail.ncku.edu.tw
• 关键词：Non ; Newtonian fluid – Power ; law fluid – Electroosmotic flow – Microchannel – Passive mixing – Micromixer
• 刊名：Rheologica Acta
• 出版年：2012
• 出版时间：October 2012
• 年：2012
• 卷：51
• 期：10
• 页码：925-935
• 全文大小：611.4 KB
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• 作者单位：1. Department of Mechanical Engineering, National Cheng Kung University, Tainan, 70101 Taiwan, Republic of China2. Department of Aeronautics and Astronautics, National Cheng Kung University, Tainan, 70101 Taiwan, Republic of China
• ISSN：1435-1528

文摘

A numerical investigation is performed into the flow characteristics and mixing performance of electrokinetically driven non-Newtonian fluid in a contraction–expansion microchannel. In the study, the rheological behavior of the fluid is characterized using a power-law model. The results show that the volumetric flow rate reduces as the flow behavior index increases, and thus an improved mixing performance is obtained. Furthermore, it is shown that for all considered values of the flow behavior index, the mixing performance can be enhanced by increasing the ratio of the main channel width to the contraction channel width, extending the length of the contraction channel, assigning a smaller value to the nondimensional Debye–Hückel parameter, and applying an appropriate electric field strength. Finally, it is shown that although the mixing efficiency reduces with a reducing flow behavior index, an acceptable mixing performance can still be obtained given an appropriate specification of the flow conditions and geometry parameters.