TRANSIENT CONJUGATED HEAT-TRANSFER ANALYSIS FROM A SPHERE

The phenomena of conjugate unsteady heat transfer from a solid spheric al particle in a convective environment is numerically investigated fo r Reynolds numbers in the range from 0.1 to 100. The flow and energy e quations for both dispersed and continuous phases are solved using a C hebyshev-Legendre spectral method. This work is an extension of the pr evious effort of simulating flow around a sphere using spectral method [2] to include heat transfer. General findings indicate that quasi-st eady analysis underestimates the overall heat transfer rate significan tly at very early time stages, however the extent of underprediction b ecomes less as time progresses. The underprediction of the quasi-stead y assumption becomes larger as Reynolds number increases for a fixed P randtl number.