Generalized flow regime diagram of fluidized beds based on the height to bed diameter ratio

► The H/D ratio has a negligible effect on the minimum fluidization velocity. ► The minimum bubbling velocity of group A is strongly dependent by H/D ratio. ► Relationships for ReMB and ReMS were developed. ► All models were validated by various experimental data sources. ► Generalized flow regime diagram is developed to describe powders fluidization state.