Table 1 shows the solids holdup predicted from the correlations and the predictions for most of the cases are in good agreement with the experimental data. The solids holdup
for 0.003m particles system with perforated plate and at Ul/Umf = 1.7, is in excellent agreement with data. Some discrepancy is observed at higher liquid velocity (Ul/Umf = 3.1). Despite the difference from the correlation, the holdups obtained from bed expansion agree well with that from pressure drop measurement.