There are few experimental methodologies found for determination of minimum fluidization porosity.
Method 1: Measure of average differential pressure between two levels of the bed.
The minimum fluidization porosity can be determined with the aid of measurement of the differential pressure between two pressure tappings located within the bed, distant from L, as function of decreasing gas velocity.
(Polystyrene, dp=1840mm, Dc=0,192m, Ms=0,822kg, Ho=0,192m)
Method 2: Measure of expanded bed height
If H is the bed height with mass Ms and A is the cross sectional area of the column, the bed porosity may be defined as