Mixing of non-Newtonian fluids in wavy serpentine microchannel using electrokinetically driven flow

Ching Chang Cho, Chieh Li Chen, Cha'o Kuang Chen

研究成果: Article同行評審

35 引文 斯高帕斯(Scopus)

摘要

A numerical investigation is performed into the mixing performance of electrokinetically driven non-Newtonian fluids in a wavy serpentine microchannel. The flow behavior of the non-Newtonian fluids is described using a power-law model. The simulations examine the effects of the flow behavior index, the wave amplitude, the wavy-wall section length, and the applied electric field strength on the mixing performance. The results show that the volumetric flow rate of shear-thinning fluids is higher than that of shear-thickening fluids, and therefore results in a poorer mixing performance. It is shown that for both types of fluid, the mixing performance can be enhanced by increasing the wave amplitude, extending the length of the wavy-wall section, and reducing the strength of the electric field. Thus, although the mixing efficiency of shear-thinning fluids is lower than that of shear-thickening fluids, the mixing performance can be improved through an appropriate specification of the flow and geometry parameters. For example, given a shear-thinning fluid with a flow behavior index of 0.8, a mixing efficiency of 87% can be obtained by specifying the wave amplitude as 0.7, the wavy-wall section length as five times the characteristic length, the nondimensional Debye-Huckel parameter as 100, and the applied electric field strength as 43.5 V/cm.

原文English
頁(從 - 到)743-750
頁數8
期刊Electrophoresis
33
發行號5
DOIs
出版狀態Published - 2012 3月

All Science Journal Classification (ASJC) codes

  • 分析化學
  • 生物化學
  • 臨床生物化學

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