Estimation of bubble parameters from differential pressure measurements in gas-fluidized beds

Whether or not the maximum in the differential pressure fluctuation due to bubble passage occurs when the bubble boundary touches the probe is examined, based on the Davidson's theoretical model for the pressure field around a bubble. The predictions based on the various inflection points in a...

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Bibliographic Details
Published in:Powder technology 1996-05, Vol.87 (2), p.113-126
Main Authors: Venkata Ramayya, A., Venkateshan, S.P., Kumar Kolar, Ajit
Format: Article
Language:English
Subjects:
Applied sciences
Chemical engineering
Exact sciences and technology
Fluidization
Fluidized beds
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Summary:Whether or not the maximum in the differential pressure fluctuation due to bubble passage occurs when the bubble boundary touches the probe is examined, based on the Davidson's theoretical model for the pressure field around a bubble. The predictions based on the various inflection points in a differential pressure fluctuation record are examined carefully with regard to the characterization of apparent bubble pierced length. Experimental evidence is presented to substantiate these. The use of point pressure fluctuations in retrieving the true bubble pierced length from the apparent bubble pierced length is illustrated. The effect of practical limiting factors in probe design on the estimation of bubble parameters is studied in order to obtain a sound interpretation of the resultant probe response.
ISSN:0032-5910
1873-328X
DOI:10.1016/0032-5910(95)03082-4