THE EFFECT OF BED DIAMETER ON THE BEHAVIOR OF BUBBLES IN GAS-SOLID FLUIDIZED BEDS

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Abstract
Behavior of rising bubbles has been studied in fluidized beds of 21.4, 37.8 and 59.9 cm I.D. Sands of mean size 0.202 mm were fluidized by air at velocities ranging up to 25 cm/sec. Bubble frequency and volume fraction of bubbles in the beds were measured with a capacitance probe. Upward and downward forces produced by fluidization were measured with a strain gage probe. Bubble diameter and rising velocity were evaluated by analyzing the experimental results. In the level region up to about 20 cm from the distributor, bubbles coalesced rapidly, rising along the wall of the bed. Particles flowed up along the wall and flowed down through the central portion of the bed. In the region of levels higher than about 20 cm from the distributor, the behavior of bubbles was strongly affected by the wall of the bed as the bubbles grew larger. Particles flowed down along the wall and flowed up through the central portion of the bed.

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