MHD power generation is a new system of electric power generation which is said to be of high efficiency and low pollution. In advanced countries MHD generators are widely used but in developing countries like INDIA, it is still under construction. The work is in progress at TRICHI in TAMIL NADU, under the joint efforts of BARC (Bhabha Atomic Research Center), Associated Cement Corporation (ACC) and Russian technologists.80% of total electricity produced in the world is hydal, while remaining 20% is produced from nuclear, thermal, solar, geothermal energy and from magnetohydrodynamic (mhd) generator. MHD is concerned with the flow of a conducting fluid in the presence of magnetic and electric field. The fluid may be gas at elevated temperatures or liquid metals like sodium or potassium. Heat and mass transfer play a vital role in fluid flow with or without application of an external transverse magnetic field. Thermal energy transmission and mass transport of the species are more prominent in the rotational flow of a liquid or gas. In case of porous media, the permeability of the pores modifies the flow behaviour to a great extent. This paper deals with the study of heat and mass transfer effects on magnetohydrodynamic free convection flow of a viscous conducting fluid in a porous vertical channel with Hall current. Expressions for primary velocity, secondary velocity, temperature and concentration have been obtained by solving the constitutive equations. It is observed that the primary velocity increases with the increase of Hall parameter and decreases with the rise of Hartmann number. The temperature falls with Reynolds number R and the concentration falls with Schmidt number Scas well as Reynolds number R.
Heat & mass transfer, MHD, Channel, Viscous fluid, Hall current
