Entrainment and Transport Disengaging Height

Entrainment from fluidized beds is also affected by temperature and pressure. Increasing system pressure increases the amount of solids carried over with the exit gas because the drag force on the particles increases at higher gas densities. May and Russell (1953) and Chan and Knowlton (1984) both found that pressure increased the entrainment rate from bubbling fluidized beds significantly. The data of Chan and Knowlton are shown in Fig. 13. 

Chan and Knowlton (1984) also investigated the effect of system pressure on the transport disengaging height (TDH) over a pressure range of 1 to 30 bar. They found that TDH increased linearly with pressure over this range (Fig. 15). The effect of gas viscosity on TDH has not been determined experimentally by anyone thus far. 

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