Affiliations: [a] Multi-Physical Engineering Sciences Group, Mechanical Engineering Department, School of Science, Engineering and Environment (SEE), University of Salford, Manchester, UK | [b] Engineering Mechanics Research, Israfil House, Manchester, UK | [c] College of Engineering, Louisiana State University, Ruston, Louisiana, USA | [d] Department of Mathematics, MNNIT Allahabad, Prayagraj, Uttar Pradesh, India
Correspondence:
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Corresponding author: B. Vasu, Department of Mathematics, MNNIT Allahabad, Prayagraj, Uttar Pradesh - 211004, India. E-mail: [email protected]
Abstract: Unsteady viscous two-dimensional magnetohydrodynamic micropolar flow, heat and mass transfer from an infinite vertical surface with Hall and Ion-slip currents is investigated theoretically and numerically. The simulation presented is motivated by electro-conductive polymer (ECP) materials processing in which multiple electromagnetic effects arise. The primitive boundary layer conservation equations are transformed into a non-similar system of coupled non-dimensional momentum, angular momentum, energy and concentration equations, with appropriate boundary conditions. The resulting two-point boundary value problem is solved numerically by an exceptionally stable and well-tested implicit finite difference technique. A stability analysis is included for restrictions of the implicit finite difference method (FDM) employed. Validation with a Galerkin finite element method (FEM) technique is included. The influence of various parameters is presented graphically on primary and secondary shear stress, Nusselt number, Sherwood number and wall couple stress. Secondary (cross flow) shear stress is strongly enhanced with greater magnetic parameter (Hartmann number) and micropolar wall couple stress is also weakly enhanced for small time values with Hartmann number. Increasing thermo-diffusive Soret number suppresses both Nusselt and Sherwood numbers whereas it elevates both primary and secondary shear stress and at larger time values also increases the couple stress. Secondary shear stress is strongly boosted with Hall parameter. Ion slip effect induces a weak modification in primary and secondary shear stress distributions. The present study is relevant to electroconductive non-Newtonian (magnetic polymer) materials processing systems.
Keywords: Micropolar fluid, Hall and Ion-slip current, thermal diffusion, species diffusion, wall couple stress, primary and secondary shear stress, magnetic field, implicit finite difference method (FDM), electroconductive polymer processing, Galerkin finite element method (FEM)
