UNSTEADY MIXED CONVECTION HEAT-TRANSFER FROM A HORIZONTAL CIRCULAR-CYLINDER

A numerical investigation of an unsteady mixed convection from a horizontal circular cylinder is presented. The coupled basic equations of motion and energy are solved for two cases (1) Re equals 100, Gr equals 10**4 and (2) Re equals 200, Gr equals 5 multiplied by 10**4. The velocity field and the temperature field around the cylinder are exhibited by streamlines and isotherms at different times. The Strouhal number for the shedding of vortices in the wake of the cylinder is calculated. Figures have been drawn to show the variations of the local and the mean Nusselt numbers with time. The effects of the presence of free convection are discussed.