JMAT_V4_N1_RP3 J. Girish Kumar Journal on Mathematics 2277-5137 4 1 40 45 Viscous Dissipation, Parabolic Started Vertical Plate, Variable Temperature, Variable Concentration Viscous dissipation effects on the unsteady natural convective flow past a parabolic starting motion of the infinite vertical plate with variable temperature and variable mass diffusion is investigated. The plate temperature and the concentration level near the plate are raised linearly with time. The dimensionless governing unsteady, non-linear, coupled partial equations are solved by using the unconditionally stable explicit finite difference method of DuFort – Frankel's type. The effect of velocity profiles are studied for different physical parameters like Eckert number, Prandtl number, thermal Grashof number, mass Grashof number, Schmidt number, and time. It is observed that the velocity increases as the value of the thermal Grashof number or mass Grashof number increase. The trend is just reversed with respect to the Schmidt number. January - March 2015 Copyright © 2015 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=3237