Electro-magneto-hydrodynamic peristaltic pumping of couple stress biofluids through a complex wavy micro-channel

Tripathi, D; Jorar, R; Beg, OA; Kadir, A

Abstract

Biomimetic propulsion mechanisms are increasingly being explored in engineering sciences. Peristalsis is one of the most efficient of these mechanisms and offers considerable promise
in microscale fluidics. Electrokinetic peristalsis has recently also stimulated significant attention. Electrical and magnetic fields also offer an excellent mode for regulating flows. Motivated by novel applications in electro-conductive microchannel transport systems, the current article investigates analytically the electromagnetic pumping of non-Newtonian aqueous electrolytes via peristaltic waves in a two-dimensional microchannel with different
peristaltic waves propagating at the upper and lower channel wall (complex wavy scenario). The Stokes couple stress model is deployed to capture micro-structural characteristics of real
working fluids. The unsteady two-dimensional conservation equations for mass and momentum conservation, electro-kinetic and magnetic body forces, are formulated in two-dimensional Cartesian co-ordinates. The transport equations are transformed from the wave frame to the laboratory frame and the electrical field terms rendered into electrical potential terms via the Poisson-Boltzmann equation, Debye length approximation and ionic Nernst Planck equation. The dimensionless emerging linearized electro-magnetic boundary value problem is solved using integral methods. The influence of Helmholtz-Smoluchowski velocity (characteristic electro-osmotic velocity), couple stress length parameter (measure of the polarity of the fluid), Hartmann magnetic number, and electro-osmotic parameter on axial
velocity, volumetric flow rate, time-averaged flow rate and streamline distribution are visualized and interpreted at length.

Citation

Tripathi, D., Jorar, R., Beg, O., & Kadir, A. (2017). Electro-magneto-hydrodynamic peristaltic pumping of couple stress biofluids through a complex wavy micro-channel. Journal of Molecular Liquids, 236, 358-367. https://doi.org/10.1016/j.molliq.2017.04.037

• Journal Article Type: Article
• Acceptance Date: Apr 11, 2017
• Online Publication Date: Apr 13, 2017
• Publication Date: Apr 13, 2017
• Deposit Date: Apr 19, 2017
• Publicly Available Date: Apr 13, 2018
• Journal: Journal of Molecular Liquids
• Print ISSN: 0167-7322
• Publisher: Elsevier
• Volume: 236
• Pages: 358-367
• DOI: https://doi.org/10.1016/j.molliq.2017.04.037
• Publisher URL: http://dx.doi.org/10.1016/j.molliq.2017.04.037
• Related Public URLs: https://www.journals.elsevier.com/journal-of-molecular-liquids/