ISSN:
0001-1541
Keywords:
Chemistry
;
Chemical Engineering
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Process Engineering, Biotechnology, Nutrition Technology
Notes:
The effectiveness of fluidized beds is limited by the presence of density fluctuations such as those caused by gas bubbles. The size and frequency of such bubbles were measured in airfluidized beds of glass beads and silica-alumina catalyst with a gamma-ray absorption technique used.The results showed that the gas bubbles developed owing to an influx of gas from the continuous dense phase. With increasing elevation in the bed the volumetric rate of bubble flow approached as a limit the total air flow minus the flow through the dense phase corresponding to minimum fluidization. The growth rate of bubble diameter was as much as 0.17 in./in. of elevation. Fluidization was most uniform with the cracking catalyst, for which the apparent density of the dense phase decreased with increasing gas velocity.
Additional Material:
15 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/aic.690060122
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