Fluidization experiments were performed in cylindrical test sections having internal diameters 2.5-inch, 4-inch and 6-inch as depicted in Figure . The following differential pressure measurements are reported in the current study: ∆P 2 = P 1 -P 2 , ∆P 3 = P 2 -P 3 , ∆P 4 = P 3 -P 6 and ∆P 5 = P 1 -P 6 for the 2.5-inch test section and ∆P 2 = P 1 -P 3 , ∆P 3 = P 3 -P 4 and ∆P 6 = P 1 -P 5 for the 4-inch and 6-inch units. The exact location of pressure ports are summarized in Table . Differential pressure signals were recorded at 100 hz for a duration of 180 seconds. High-Efficiency Particulate Air (HEPA) filters were used at the exit to trap particles being elutriated from the units. Tests were performed in a randomized order which includes replicates as shown in Table .