MEASUREMENTS OF HEAT-TRANSFER COEFFICIENTS BETWEEN GAS AND PARTICLES FOR A SINGLE SPHERE AND FOR MOVING BEDS

For obtaining the convective heat transfer coefficient between gas and particles at high temperature, heat transfer experiments and mathematical model simulation were carried out both for a single sphere and for a counter-current moving bed. If the radiative heat transfer should be evaluated quantitatively, the convective heat transfer coefficient based on the previously empirical equations reported by Ranz and other researchers were available for the evaluation of convective heat transfer around a single sphere. From the experiments and the mathematical model simulation with heat transfer of the moving bed, the following empirical equation was obtained as the equation for determining the convective heat transfer coefficient in the moving bed. Nu = 2.0 + 0.39Rep1/2Pr1/3