Abstract
Soret–Dufour effects on MHD heat and mass transfer of Walter’s-B viscoelastic fluid over a semi-infinite vertical plate are considered. The equations of motion are set of partial differential equations; these are non-dimensionalized by introducing an appropriate non-dimensional quantity. The dimensionless equations along with the boundary conditions are solved numerically using the spectral relaxation method (SRM). All programs are coded in MATLAB R2012a. Results are presented in graphs, and numerical computations of the local skin friction, local Nusselt number and local Sherwood number are presented in a tabular form. The result revealed that as the viscoelastic parameter increases, the velocity profile close to the plate decreases but when far away from the plate, it increases slightly. The present results were found to be in good agreement with those of the existing literature.
Highlights
The physical effects occur in MHD basically when a conductor migrates into a magnetic field, electric current is induced and creates its own magnetic field (Lenz’s law)
It is noted that a decrease in Soret number and an increase in Dufour number produce a decrease in the velocity and concentration profiles
Spectral relaxation method (SRM) is employed to solve a third-order-coupled partial differential equations that govern the effects of Soret and Dufour on MHD heat and mass transfer of a viscoelastic fluid pass over a semi-infinite vertical plate
Summary
The physical effects occur in MHD basically when a conductor migrates into a magnetic field, electric current is induced and creates its own magnetic field (Lenz’s law). Choudhury and Kumar Das [2] studied viscoelastic MHD-free convective flow through porous media in the presence of radiation and chemical reaction with heat and mass transfer Their governing partial differential equations were solved using the multiple perturbation technique. Vedavathi et al [4] considered radiation and mass transfer effects on unsteady MHD convective flow over an infinite vertical plate with Dufour and Soret effects It is noted that a decrease in Soret number and an increase in Dufour number produce a decrease in the velocity and concentration profiles In another investigation of Sharma and Aich [5], the effects of Soret and Dufour were significant.
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