Unsteady natural convective flow past a moving vertical cylinder with heatand mass transfer

Transient natural convection boundary layer flow of an incompressible visco us fluid past an impulsively moving semi- infinite vertical cylinder is con sidered. The temperature and concentration of the cylinder surface are take n to be uniform. The unsteady, nonlinear and coupled governing equations of the flow are solved using an implicit finite difference scheme. The finite difference scheme is unconditionally stable and accurate. Numerical result s are presented with various sets of parameters for both air and water. Tra nsient effects of velocity, temperature and concentration profiles are anal yzed. Local and average skin friction, rates of heat and mass transfer are shown graphically.