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Electroosmotic Flow of Non-Newtonian Fluid in Porous Polymer Membrane at High Zeta Potentials.

Authors
  • Deng, Shuyan1
  • Zeng, Yukun2
  • Li, Mingying1
  • Liang, Cuixiang1
  • 1 Institute of Architecture and Civil Engineering, Guangdong University of Petrochemical Technology, Maoming 525000, Guangdong, China. , (China)
  • 2 Institute of Mechanical and Electrical Engineering, Guangdong University of Petrochemical Technology, Maoming 525000, Guangdong, China. , (China)
Type
Published Article
Journal
Micromachines
Publisher
MDPI AG
Publication Date
Nov 27, 2020
Volume
11
Issue
12
Identifiers
DOI: 10.3390/mi11121046
PMID: 33260968
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

To help in the efficient design of fluid flow in electroosmotic pumps, electroosmotic flow of non-Newtonian fluid through porous polymer membrane at high zeta potentials is studied by mainly evaluating the total flow rate at different physical parameters. Non-Newtonian fluid is represented by the power-law model and the porous polymer membrane is considered as arrays of straight cylindrical pores. The electroosmotic flow of non-Newtonian fluid through a single pore is studied by solving the complete Poisson-Boltzmann equation and the modified Cauchy momentum equation. Then assuming the pore size distribution on porous polymer membrane obeys Gaussian distribution, the performance of electroosmotic pump operating non-Newtonian fluid is evaluated by computing the total flow rate of electroosmotic flow through porous polymer membrane as a function of flow behavior index, geometric parameters of porous membrane, electrolyte concentration, applied voltage, and zeta potential. It is found that enhancing zeta potential and bulk concentration rather than the applied voltage can also significantly improve the total flow rate in porous polymer membrane, especially in the case of shear thinning fluid.

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