Computation of non-similar flow of a magnetic pseudoplastic nanofluid over a circular cylinder with variable thermophysical properties and radiative flux

Beg, OA ORCID: https://orcid.org/0000-0001-5925-6711, Basha, HT, Sivaraj, R and Prasad, VR 2020, 'Computation of non-similar flow of a magnetic pseudoplastic nanofluid over a circular cylinder with variable thermophysical properties and radiative flux' , International Journal of Numerical Methods for Heat & Fluid Flow . (In Press)

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Abstract

Generally, in computational thermofluid dynamics, the thermophysical properties of flu- ids (e.g. viscosity and thermal conductivity) are considered as constant. However, in many applications, the variability Of these properties plays a significant role in modify- ing transport characteristics While the temperature difference in the boundary layer is notable. These include drag reduction in heavy oil transport systems, petroleum purifi- cation and coating manufacturing. Motivated by the last of these applications, in the current study, a comprehensive mathematical model is developed to explore the impact of variable viscosity and variable thermal conductivity characteristics in magnetohydrody- namic non-Newtonian nanofluid enrobing boundary layer flow over a horizontal circular cylinder in the presence of cross diffusion (Soret and Dufour effects) and appreciable thermal radiative heat transfer under a static radial magnetic field. The Williamson pseudoplastic model is deployed for rheology Of the nanofluid. Buongiornos two com- ponent model is employed for effects. The dimensionless nonlinear partial differential equations have been solved by using an implicit finite difference Keller box scheme. Extensive validation with earlier studies in the absence of nanoscale and vari- able property effects is included. The influence of notable parameters like Weissenberg number, variable viscosity, variable thermal conductivity, Soret and Dufour numbers on heat, mass and momentum characteristics are scrutinized and visualized via graphs and tables. The outcomes disclcxse that the Williamson nanofluid velocity declines by enhanc- ing the Lorentz hydromagnetic force in the radial direction. Thermal and nanoparticle concentration boundary layer thickness are enhanced With greater streamwise coordinate values. An increase in Dufour number or a decrease in Soret number slightly enhances the nanofluid temperature and thickens the thermal boundary layer. Flow deceleration is induced with greater viscosity parameter. Nanofluid temperature is elevated with greater Weissenberg number and thermophoresis nanoscale parameter.

Item Type: Article
Schools: Schools > School of Computing, Science and Engineering
Journal or Publication Title: International Journal of Numerical Methods for Heat & Fluid Flow
Publisher: Emerald
ISSN: 0961-5539
Depositing User: OA Beg
Date Deposited: 29 Jul 2020 08:08
Last Modified: 29 Jul 2020 08:15
URI: http://usir.salford.ac.uk/id/eprint/57734

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