Pressure fluctuations and X‐ray computed tomography (CT) measurements were utilized to characterize the flow behavior of gas‐solid fluidized beds using polyethylene particles in three Plexiglas columns with diameters of 10cm, 20cm, and 30cm. Air was used as the gas phase. Gas‐solids flow dynamic under ambient conditions was characterized from statistical analysis of pressure fluctuation data and CT images. The time‐averaged voidage distribution, bubble phase area fraction, bubble diameter and bubble number distribution varying with the bed heights were extracted from all the three columns. Bed scales had significant effect on the hydrodynamics. Scale up effects on the gas‐solids two‐phase flow behavior were discussed.

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