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The effect of particle size and bed height on the expansion of mixed phase (gas—liquid) fluidized beds

✍ Scribed by K. Østergaard; P.I. Theisen

Publisher
Elsevier Science
Year
1966
Tongue
English
Weight
376 KB
Volume
21
Category
Article
ISSN
0009-2509

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✦ Synopsis

The expansion of gas-liquid fluidized beds has been measured for beds of glass ballotini fluidized by air/water. Particle diameters varied from 0.28 to 2.2 mm, and settled bed heights from U-107 cm. The flow rates of air and water were varied independently.

The expansion of a liquid fluidized bed is often reduced when a swarm of gas bubbles is injected into the bed. This bed contraction is largest for beds of small particles; a contraction of 48 per cent has been observed in a highly expanded bed of 0.28 mm ballotini. For small particles the largest contraction was observed in beds of high height to diameter ratio. For larger particles the contraction is less pronounced, and no significant effect of the ratio between bed height and diameter was observed.

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