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An analysis is performed to study the effects of thermal and mass  stratification in a transient free convective flow of a viscous,  incompressible fluid past an isothermal vertical plate. The governing  boundary layer equations are solved numerically using an implicit finite  difference scheme of Crank-Nicolson type. The doubly stratified effects on  the velocity, temperature and concentration are shown graphically. It is  observed that an increase in thermal stratification parameter decreases the  velocity, temperature profiles and increases the concentration profiles. As  well, increase in mass stratification parameter decreases the velocity,  concentration profiles and increases the temperature profiles. Also, the  influence of the thermal and mass stratification parameter on local as well  as average skin-friction, the rate of heat and mass transfer are discussed  and presented graphically. The results are compared with particular solutions  available in the literature. The present results are found to be in good  agreement with the existing particular solution of the problem.

Doubly stratified effects in a free convective flow over a vertical plate with heat and mass transfer