Numerical analysis of heat and mass transfer from a sphere with surface mass injection or suction.

Abstract

Numerical analyses for heat and mass transfer of a solid sphere without and with uniform, sinusoidal and evaporative mass injection or suction were made by use of a finite difference method for Rep = 1-200, Pr or Sc = 0.5-2 and φ= -0.2-0.5. Numerical results for the case without mass injection or suction showed good agreement with the results of previous workers. Heat and mass transfer rates with uniform mass injection or suction were found to be affected by Rep and Pr or Sc as well as mass injection ratio, φ. New correlations for the effect of mass injection or suction on heat and mass transfer rates for the case with uniform and sinusoidal mass injection or suction in terms of transfer number were proposed. Heat and mass transfer rates with sinusoidal mass injection or suction showed good agreement with those for evaporative mass injection or suction.