ON GABOR'S ALTERNATE-SLAB MODEL

Abstract

Gabor's alternate-slab model for calculating heat transfer between a wall and a moving packed or fluidized bed has been further developed using a physically more realistic numerical procedure. Two explicit techniques were examined. In one scheme, the new temperatures were calculated from the temperatures determined during the previous time interval. In the second scheme, the new temperatures were calculated using an average value of old and new temperatures calculated during the current time interval. The predictions of heat transfer rates for the refined alternate-slab model using old temperatures and those of the Mickley-Fairbanks model agree with each other at large values of t/d_p ² for the same gas gap thickness of 0.13d_p. The second scheme, which has more realistic attributes, leads to a gas gap of O.16d_p, which is in better agreement with the experimental data for air-glass and air-copper systems.