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208 3. Heterogeneous Processes and Reactor Analysis

Figure 3.57 General representation of the two-phase model.

Figure 3.58 Bubble and particulate phase.

Bubbling bed model of Kunii and Le v enspiel Rowe and Partidge (1962) also found
out that each bubble of gas drags a substantial we of solids up the bed. On the basis of ak
indings,
these f Kunii and Leenspiel (1972) deeloped the bubbling bed model. The
v
v
assumptions used in that model are the follo wing:
• The emulsion phase stays at minimum fluidizing conditions. Thus, the relatie v v eloc-
ity of the gas and solid remains unchanged.
• All bubbles hae the same size. v
• The solids in the emulsion phase flow smoothly do essentially in plug flo ard, wnw . w