Numerical Study of Heat and Mass Transfer MHD Viscous Flow Over a Moving Wedge in the Presence of Viscous Dissipation and Heat Source/Sink with Convective Boundary Condition Rashid Ahmad 1 and Waqar Ahmed Khan 2 1 School of Mathematics and Physics University of Queensland, St. Lucia, Brisbane, Queensland, Australia 2 Department of Engineering Sciences, PN Engineering College, National University of Science and Technology, Karachi, Pakistan In this article, the effects of viscous dissipation and internal heat generation/ab- sorption on combined heat and mass transfer MHD viscous fluid flow over a moving wedge in the presence of mass suction/injection with the convective boundary condi- tion are carried out numerically for the various values of dimensionless parameters. With the help of similarity transformation, the momentum, energy, and concentration equations are reduced to a set of dimensionless non-linear ordinary differential equations. The significance of the dimensionless velocity, temperature, mass profiles, and their gradients are presented in graphical form. Three types of flows—particularly the flat plate, vertical wedge, and stagnation point flows—in favorable and unfavor- able regimes are analyzed. The obtained results confirm that the flow field is substan- tially influenced by the magnetic, stretching/shrinking, pressure, Prandtl number, heat generation/dissipation, and mass suction/injection parameters. Current results indicate that stretching a wall boundary causes an increase in velocity, temperature, shear stress, temperature, and mass gradients while shrinking causes a decreasing trend with these profiles. The special modified form of the current problem is found to be in good agreement with the other published data. © 2013 Wiley Periodicals, Inc. Heat Trans Asian Res, 43(1): 17–38, 2014; Published online 26 August 2013 in Wiley Online Library (wileyonlinelibrary.com/journal/htj). DOI 10.1002/htj.21063 Key words: MHD wedge flow, viscous dissipation, heat generation/absorp- tion, convective boundary condition, suction/injection, stretching/shrinking, pressure gradient, Prandtl number, skin friction, heat and mass transfer coefficients 1. Introduction From the physical point of view the study of magnetohydrodynamic (MHD) flow over electrically conducting viscous fluid in a laminar boundary layer has sustained great importance in engineering and metalworking processes. The combined heat and mass transfer viscous fluid flow models are involved in many transport processes which occur both in nature and industries. There is great interest in the study of two-dimensional MHD heat and mass transfer viscous flows on the © 2013 Wiley Periodicals, Inc. Heat Transfer—Asian Research, 43 (1), 2014 17