Computation of transient radiative reactive thermo-solutal magnetohydrodynamic convection in inclined mhd hall generator flow with dissipation and cross diffusion

Beg, OA; Sheri, SR; Modugula, P; Kadir, A

Abstract

The present article investigates the collective influence of chemical reaction, viscous dissipation and Hall current magnetic effects on timedependent radiative magnetohydrodynamic flow, heat and mass transfer from an inclined wall embedded in a homogenous, isotropic highpermeability porous medium. The model developed is relevant to near wall magnetohydrodynamic energy generator transport phenomena
in which chemical corrosion effects may arise during operations. The governing non-linear partial differential equations for mass, momentum,
energy and species conservation are transformed into a system of coupled non-linear dimensionless partial differential equations with
appropriate similarity variables. The normalized conservation equations are then solved with a robust finite element method (MATLABFEM) subject to corresponding initial and boundary conditions. Important dimensionless parameters emerging are Eckert number, thermal
Grashof number, solutal Grashof number, magnetic body force parameter, Hall parameter, permeability parameter, Dufour number, Soret
number, time, radiation-conduction parameter, chemical reaction parameter, heat absorption parameter, Prandtl number, Schmidt number
and wall angle. Primary velocity is enhanced with Eckert number, thermal Grashof number, solutal Grashof number, Hall parameter,
permeability parameter, Dufour number, Soret number, radiation-conduction parameter and time whereas it is reduced with first order
chemical reaction parameter, heat absorption, magnetic body force parameter, Prandtl number, Schmidt number and wall inclination.
Secondary velocity is elevated with Eckert number, solutal Grashof number, thermal Grashof number, magnetic body force parameter, Hall
parameter, radiation-conduction parameter, Dufour number, Soret number and time whereas it is suppressed with reaction parameter, heat
absorption, Prandtl number, Schmidt number and wall inclination. Temperature is enhanced with Eckert number, Dufour number, heat
absorption, radiation-conduction parameter and time whereas it is depressed with Prandtl number. Species concentration is reduced with
increasing chemical reaction parameter (destructive homogenous reaction) and Schmidt number whereas it is elevated with Soret number
and time. Extensive discussion of the finite element formulation, convergence and validation is provided Skin friction, Nusselt number and
Sherwood number distributions are also provided for selected parameter variation. Validation of solutions with published literature is also
included for several special cases, namely non-reactive, non-dissipative flow in the absence of heat generation or absorption. Further
validation is included using a multi-step differential transform method (MS-DTM). The present simulations provide an interesting insight into
complex fluid/thermal/species diffusion characteristics in the boundary layer region of relevance to working MHD generator systems.

Citation

Beg, O., Sheri, S., Modugula, P., & Kadir, A. (2020). Computation of transient radiative reactive thermo-solutal magnetohydrodynamic convection in inclined mhd hall generator flow with dissipation and cross diffusion. Computational Thermal Sciences, 11(6), 541-563. https://doi.org/10.1615/ComputThermalScien.2019026405

• Journal Article Type: Article
• Acceptance Date: Feb 1, 2020
• Online Publication Date: Mar 11, 2020
• Publication Date: Mar 11, 2020
• Deposit Date: Feb 3, 2020
• Publicly Available Date: Mar 11, 2021
• Journal: Computational Thermal Sciences: An International Journal
• Print ISSN: 1940-2503
• Electronic ISSN: 1940-2554
• Publisher: Begell House
• Volume: 11
• Issue: 6
• Pages: 541-563
• DOI: https://doi.org/10.1615/ComputThermalScien.2019026405
• Publisher URL: https://doi.org/10.1615/ComputThermalScien.2019026405
• Related Public URLs: https://www.begellhouse.com/journals/648192910890cd0e