The heat generation/absorption and thermo-diffusion on an unsteady free convective MHD flow of radiating and chemically reactive second grade fluid near an infinite vertical plate through a porous medium and taking the Hall current into account have been studied. Assume that the bounding plate has a ramped temperature with a ramped surface concentration and isothermal temperature with a ramped surface concentration. The analytical solutions for the governing equations are obtained by making use of the Laplace transforms technique. The velocity, temperature, and concentration profiles are discussed through graphs. We also found that velocity, temperature, and concentration profiles in the case of ramped temperature with ramped surface concentrations are less than those of isothermal temperature with ramped surface concentrations. Also, the expressions of the skin friction, Nusselt number, and Sherwood number are obtained and represented computationally through a tabular form.

Hall effects on unsteady MHD flow of second grade fluid through porous medium with ramped wall temperature and ramped surface concentration

The study sought to investigate the influence of a magnetic field on heat and mass transfer by mixed
convection from vertical surfaces in the presence of Hall, radiation, Soret (thermal-diffusion), and Dufour
(diffusion-thermo) effects. The similarity solutions were obtained using suitable transformations. The
similarity ordinary differential equations were then solved by MATLAB routine bvp4c. The numerical
results for some special cases were compared with the exact solution and those obtained by Elgazery
(2009) and were found to be in good agreement. A parametric study illustrating the influence of the
magnetic strength, Hall current, Dufour, and Soret, Eckert number, thermal radiation, and permeability
parameter on the velocity, temperature, and concentration was investigated.

/pdf/the-effects-of-thermal-radiation-hall-currents-soret-and-4yy4xrv5ni.pdf

The Effects of Thermal Radiation, Hall Currents, Soret, and Dufour on MHD Flow by Mixed Convection over a Vertical Surface in Porous Media

Magnetohydrodynamic free convection heat and mass transfer of a heat generating fluid past an impulsively started infinite vertical porous plate with Hall current and radiation absorption

Influence of chemical reaction and thermal radiation on mixed convection heat and mass transfer over a stretching sheet in Darcian porous medium with Soret and Dufour effects

An unsteady hydro-magnetic ∞ow of a viscoelastic ∞uid from a radiative vertical porous plate has been studied with mass transfer, taking the efiect of Hall currents into account. The resulting problem has been solved analytically and the closed form solutions are obtained for velocity, temperature and concentration distributions as well as for the shearing stress, rate of heat and mass transfer at the wall. The in∞uence of the various parameters like Hall parameter, magnetic parameter, visco-elastic parameter, frequency parameter etc. on the ∞ow fleld is examined with the help of flg

/pdf/hall-effect-on-mhd-mixed-convection-flow-of-a-viscoelastic-2dt2um6fkb.pdf

Hall effect on MHD mixed convection flow of a viscoelastic fluid past an infinite vertical porous plate with mass transfer and radiation

MHD stokes problem for a vertical infinite plate in a dissipative rotating fluid with hall current

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Magnetohydrodynamic free convection heat and mass transfer of a heat generating fluid past an impulsively started infinite vertical porous plate with Hall current and radiation absorption

MHD stokes problem for a vertical infinite plate in a dissipative rotating fluid with hall current