Entropy generation in magnetohydrodynamic radiative non-Newtonian dissipative convection flow from an inclined plane : numerical study

Gaffar, SA; Rehman, KU; Beg, OA; Prasad, VR

Abstract

A theoretical model is developed to study entropy generation in non-Newtonian
magnetohydrodynamic thermal convection from an inclined plate as a simulation of electroconductive polymer materials processing of relevance to automotive coating applications. High
temperature invokes radiative effects which are analysed with the Rosseland diffusion flux
approximation. The Jeffery’s viscoelastic model is deployed to describe the non-Newtonian
characteristics of the fluid and provides a good approximation for magnetic polymers, which
constitutes a novelty of the present work. The normalized nonlinear boundary value problem
is solved computationally with the Keller-Box implicit finite-difference technique. Extensive
solutions for velocity, surface temperature, skin friction and heat transfer rate are visualized
graphically for various thermophysical parameters. Validation is conducted with earlier
published work for the case of a vertical plate in the absence of magnetic field, radiative flux
and non-Newtonian effects. The dimensionless entropy generation is obtained via the reduced
momentum and energy equations. Bejan number is generally decreased with greater values of
Deborah number. Increasing magnetic field reduces entropy generation number whereas it
enhances the Bejan number. Increasing Brinkman number (dissipation parameter) is found to
enhance the entropy generation number whereas it suppresses the Bejan number.

Citation

Gaffar, S., Rehman, K., Beg, O., & Prasad, V. (2020). Entropy generation in magnetohydrodynamic radiative non-Newtonian dissipative convection flow from an inclined plane : numerical study. Nanoscience and Technology: An International Journal, 11(4), 297-326. https://doi.org/10.1615/NanoSciTechnolIntJ.2020033849

• Journal Article Type: Article
• Acceptance Date: Sep 30, 2020
• Online Publication Date: Oct 27, 2020
• Publication Date: Oct 27, 2020
• Deposit Date: Sep 30, 2020
• Publicly Available Date: Oct 27, 2021
• Journal: Nanoscience and Technology : An International Journal
• Print ISSN: 2572-4258
• Electronic ISSN: 2572-4266
• Publisher: Begell House
• Volume: 11
• Issue: 4
• Pages: 297-326
• DOI: https://doi.org/10.1615/NanoSciTechnolIntJ.2020033849
• Publisher URL: https://doi.org/10.1615/NanoSciTechnolIntJ.2020033849
• Related Public URLs: https://www.begellhouse.com/journals/nanoscience-and-technology.html