Computational Analysis of the Oscillatory Mixed Convection Flow along a Horizontal Circular Cylinder in Thermally Stratified Medium

摘要

The present work emphasizes the significance of oscillatory mixed convection stratified fluid and heat transfer characteristics at different stations of non-conducting horizontally circular cylinder in the presence of thermally stratified medium. To remove the difficulties in illustrating the coupled PDE's, the finite-difference scheme with efficient primitive-variable formulation is proposed to transform dimensionless equations. The numerical simulations of coupled non-dimensional equations are computed in terms velocity of fluid, temperature and magnetic field which are computed to examine the fluctuating components of skin friction, heat transfer and current density for various emerging parameters. The governing parameters namely, thermally stratification parameter S_t, mixed-convection parameter λ, Prandtl number Pr, magnetic force parameter ξ and magnetic-Prandtl number γ are displayed graphically at selected values for velocity and heat transfer mechanism. It is computed that heat transfer attains maximum amplitude and good variations in the presence of thermally stratified parameter at each position α = π/6, α = π/3 and α = π around the surface of non-conducting horizontally cylinder. The velocity of fluid attains certain height at station α = π/6 for higher value of stratification parameter. It is also found that the temperature gradient decreases with stratification parameter S_t, but it increases after a certain distance Y from the cylinder. The novelty of the current work is that due to non-conducting phenomena the magnetic effects are strongly observed far from the surface but exact at the surface are zero for each position.