Abstract
An analysis is performed to study unsteady double-diffusive natural convective flow of nanofluid over vertical cylinder. The model used for the binary nanofluid incorporates the effects of Brownian motion and thermophoresis. In addition the thermal energy equations include regular diffusion and cross-diffusion terms. The governing boundary layer equations along with the initial and boundary conditions are first cast into a dimensionless form and the resulting system of equations are then solved using an explicit finite-difference scheme of the Crank-Nicolson type. Numerical results for the steady-state velocity, temperature and nanoparticles volume fraction profiles as well as the axial distributions of the skin-friction coefficient, local Nusselt number and the local Sherwood numbers are presented graphically and discussed. The results from this investigation are well validated and have favorable comparisons with previously published results.