The dynamics of bubbles, the flow of gas and solids through the emulsion phase, and interchange of flowing gas between these two phases play a dominant role in heat transfer, mass transfer and solid-catalyzed chemical reactions. The pattern of gas flow through the bubbles has an effect on the degree of gas-solids contacting and under certain conditions a high degree of by-passing can occur. This research is aimed at understanding the aspects of bed hydrodynamics, especially to investigate the gas flow patterns inside the bubbles and solids’ mixing in a fluidized bed.

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