¹Plot No 193, Jayadev Vihar ,Bhubaneswar-13 (India)

²Department of physics, Bhabanipatna Autonomous College, Bhabanipatna,orissa (India)

³Department of physics, Bhadrak Autonomous College , Bhadrak Orissa (India)

 Hall effects on combined free and forced convective flow of a viscous incompressible electrically conducting fluid between two horizontal perfectly conducting plates under the action of a uniform transverse magnetic field applied paralled to the axis of rotation has been analysed. Exact solution of the governing equation is obtained in closed form. It is observed that Hall current exerts stabilizing influence on the primary flow at the upper plate due to shear stress while at the lower plate Grashof number causes separation on the secondary flow. The interaction of wall porosity and Hall current greatly influence the flow field. The rate of heat transfer at both the plates are derived. It is found that the Hall current and rotation exert reverse flow of heat at the upper plate when the numerical value is equal to two as the Grashof number is being referred to. Mass transfer is also studied with the help of graph between concentration and channel length.