CONJUGATE HEAT AND MASS-TRANSFER FROM A SOLID SPHERE IN THE PRESENCE OF A NONISOTHERMAL CHEMICAL-REACTION

This paper analyzes the influence of the conductivity ratio, Phi(lambd a), the volume heat capacity ratio, Phi(h), and the diffusivity ratio, Phi(D), on the conjugate heat and mass transfer from a particle in th e presence of a chemical reaction. The nonisothermal, first-order irre versible chemical reaction takes place in the particle. Both exothermi c and endothermic reactions are studied. The creeping flow and the mod erate Reynolds number domain are the hydrodynamic regimes considered. For the exothermic reaction, the particle average temperature and conc entration and the effectiveness factor are strongly influenced by the variation of the physical properties ratios. For the endothermic react ion, these effects are considerably less significant. The change of th e hydrodynamic regime did not lead to any new or spectacular result. T he interphase heat-and mass-transfer coefficients are equal and indepe ndent of the physical properties ratios.