In this paper new correlations are developed, for cases where the heig
ht of the bed to column diameter ratio (H/D-c) is below and above unit
y. Based on 356 published data points (16 different sources with 23 di
fferent solids with a wide range of variables) along with those of the
author are used for developing the correlations. The present proposed
equations are more exact and simpler to use than previous empirical c
orrelation.