Electro-osmotic nanofluid flow in a curved microchannel

Narla, VK; Tripathi, D; Beg, OA

Abstract

Biological mechanisms offer significant improvement in the efficiency of next generation energv systems. Motivated by new developments in distensible pumping systems, ionic electro-kinetic manipulation and nanoscale liquids(“nanofluids"), in the present study a mathematical model is developed to simulate the entropy generation and electro-osmotic transport of nanofluids in a curved deformable microchannel driven by peristaltic transport. Both thermal and species (nano-particle) buoyancy effects are included and Soret and Dufour cross-diffusion effects. The appropriate conservation equations are normalized with scaled variables and the resulting dimensionless nonlinear boundary value problem is solved in a transformed coordinate system. Simplification of the mathematics is achieved via lubrication approximations and low zeta potential (Debye Hückel linearization). The effects of various parameters, i.e. electro-osmotic velocity, EDL (electrical double layer) thickness and zeta potential ratio on velocity profile and temperature profiles are computed. The effects of Brinkman number (viscous heating parameter) and Joule (electrical field heating) parameter on nano-particle concentration profiles are also simulated. The micro-channel curvature effects on the nanofluid flow characteristics and thermal characteristics are also computed. Furthermore, streamline patterns, temperature contours, nano-particles concentration contours and entropy generation rate contours are plotted for various curvature parameters. Results indicate that the curvature of the channel
and electro-osmotic body force influence strongly the sources of entropy generation rate. The study finds applications in bio-inspired nanofluid pumping in microscale energy applications.

Citation

Narla, V., Tripathi, D., & Beg, O. (2020). Electro-osmotic nanofluid flow in a curved microchannel. Chinese Journal of Physics, 67, 544-558. https://doi.org/10.1016/j.cjph.2020.08.010

• Journal Article Type: Article
• Acceptance Date: Aug 16, 2020
• Online Publication Date: Aug 21, 2020
• Publication Date: Oct 1, 2020
• Deposit Date: Aug 21, 2020
• Publicly Available Date: Aug 21, 2021
• Journal: Chinese Journal Of Physics
• Print ISSN: 0577-9073
• Publisher: Elsevier
• Volume: 67
• Pages: 544-558
• DOI: https://doi.org/10.1016/j.cjph.2020.08.010
• Publisher URL: https://doi.org/10.1016/j.cjph.2020.08.010
• Related Public URLs: https://www.journals.elsevier.com/chinese-journal-of-physics