LAMINAR MIXED CONVECTION FROM A UNIFORM HEAT-FLUX HORIZONTAL CYLINDER IN A CROSS-FLOW

An analysis of combined forced and natural convection (mixed convection) heat transfer from a horizontal cylinder dissipating a uniform heat flux is conducted by solving the full two-dimensional steady-state Navier Stokes and energy equations. For Pr = 0.7, flowfields and transport results are determined in the ranges of Reynolds numbers 1 less-than-or-equal-to Re(D) less-than-or-equal-to 60 and the modified Grashof numbers 0 less-than-or-equal-to Gr(D)* less-than-or-equal-to 1.6 x 10(4). The results are presented as local and average values of the Nusselt number, the vorticity, the pressure distribution and the coefficient of drag around the cylinder. Correlation for the average Nusselt number and the coefficient of drag around the cylinder in the forced convection regime is suggested. Comparison with theoretical and experimental correlations is established. It was established that the Nusselt number as well as drag coefficient increase with the buoyancy parameter. It was also shown that uniform heat flux horizontal cylinder has higher Nusselt number than a cylinder under uniform surface temperature.