M.A. Moghimi - Department of Mechanical Engineering, Shaid Bahonar University of Kerman, Iran
M. Ameri - Department of Mechanical Engineering, Shaid Bahonar University of Kerman, Iran

Effects of variable viscosity and thermal conductivity on magnetohydrodynamic (MHD) natural convection boundary layer flow over an isothermal sphere in the presence of heat generation/ absorption are investigated in this paper. The studied problem is solved numerically by a promising method which is named differential quadrature (DQ). In this investigation, firstly, the applicability of DQ is surveyed. For this purpose, the convergence study is performed. Also, a comparison with the early studies is done which shows the results are in great agreement. Then, the effects of different parameters such as the viscosity variation parameter, thermal conductivity variation parameter, hydromagnetic parameter and also heat source/sink parameter on the fluid velocity and temperature are studied.

MHD, variable viscosity, variable thermal conductivity, heat source/sink, DQM