Abstract: This article is on the influence of combination of viscosity in an unsteady MHD flow in a vertical channel. The governing equations of motion were employed and solved analytically. Transform is carried out on the governing equations to form sets of nonlinear coupled equation by suitable transformation using stream functions and non-dimensionalize the non-linear partial differential governing equations to ordinary differential equations using the non-dimensional quantities. Solving the resulting sets of ordinary differential equations by using perturbation technique to obtain expressions for the velocity, temperature and concentration profiles. We analyse the effects of velocity, temperature and concentration of the fluid at the various physical parameters; Womersley parameter (AI), Eckert number (Ec), Reynolds number (Re), Prandlt number (Pr), Grashof number (Gr), Schmidt number (Sc), Chemical reaction parameter (K1), and the Mass Grashof number (Gc). Graphical results are presented and discussed.
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