Abstract
The aim of the present study is to investigate the effect of the location of the heater on natural convection in a square cavity in the presence of uniform external magnetic field. The effect of orientation of magnetic field is also studied. The left wall has been heated discretely with higher temperature, whereas the right wall is maintained at lower temperature. Three different locations of heater are taken along the left wall. The governing equations are solved by the finite volume method. The heat transfer rate is enhanced on placing the heater at middle of the left wall of the cavity.