Peristaltic pumping of hybrid nanofluids through an asymmetric microchannel in the presence of electromagnetic fields

Tripathi, D, Prakash, J and Beg, OA ORCID: 2020, 'Peristaltic pumping of hybrid nanofluids through an asymmetric microchannel in the presence of electromagnetic fields' , Journal of Thermal Science and Engineering Applications . (In Press)

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Motivated by applications in bio-thermal-inspired smart electro-osmotic nanofluid micro-pumps, a mathematical model is developed to investigate the electroosmotic magnetohydrodynamic flow of hybrid nanofluids through an asymmetric microchannel. The Tiwari-Das hybrid nanofluid model is employed in this article. The effects of Joule heating are included in the governing equation. Nanoliquid thermal conductivity and viscosity are computed with the Maxwell and Brinkmann correlations. To study the performance of hybrid nanofluids, five different nanoparticles with water as the base fluid are considered i.e. titanium dioxide, alumina, copper, copper oxide and silver as the metallic nanoparticles. The boundary conditions feature velocity slip and thermal slip. Debye-Hückel linearization is employed for the electric distribution equation. Analytical solutions are derived by the power-series based Homotopy perturbation method (HPM), which is compared with MATLAB solutions (bvp4c solver). The influence of key nanoscale parameters on the pumping characteristics, axial velocity and nanoparticle temperature in the asymmetric micro-channel are visualized graphically. Higher Joule electrical heating parameter reduces pressure gradient values whereas increasing Brinkman number (viscous heating) elevates pressure gradient. Higher volume fraction suppresses pressure gradient. For water - copper oxide nanofluid, the pressure gradient decreases with increasing Hartmann (magnetic) number. Silver-water nanofluid achieves the greatest enhancement in thermal conductivity. The computations are relevant to bio-inspired electrokinetic nanofluid micropump designs and also to the fluid dynamics of soft robotics.

Item Type: Article
Schools: Schools > School of Computing, Science and Engineering
Journal or Publication Title: Journal of Thermal Science and Engineering Applications
Publisher: American Society of Mechanical Engineers
ISSN: 1948-5085
Depositing User: OA Beg
Date Deposited: 05 Oct 2020 12:14
Last Modified: 16 Feb 2022 05:47

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