Effects of Some Thermo-Physical Parameters on Free Convective Heat and Mass Transfer over Vertical Stretching Surface at Absolute Zero

Effects of some thermo-physical parameters on free convective heat and mass transfer over a vertical stretching surface at lowest level of heat energy in the presence of suction is investigated. The viscosity of the fluid is assumed to vary as a linear function of temperature and thermal conductivity is assumed constant. A similarity transformation is applied to reduce the governing equations into a coupled ordinary differential equations corresponding to the momentum, energy and concentration equations. These equations along with the boundary conditions were also solved numerically using shooting method along with Runge-Kutta Gill method. The effects of thermo-physical parameters on the velocity, temperature and concentration profiles are shown graphically. It is found that with an increase in the value of temperature-dependent fluid viscosity parameter, the velocity increases while the temperature and concentration decreases across the flow region. Dufour, Soret, Frank-Kamenetskii, Prandtl and Schmidt number activation energy also have effect. Numerical data for the local skin-friction coefficient, the local Nusselt number and the local Sherwood number have been tabulated for various values of certain parameter conditions.

Keywords:

Free convection , Newtonian fluid , Variable fluid viscosity , Surface at Absolute zero , Dufour and Soret