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Gas and liquid hold-up in three-phase fluidisation

✍ Scribed by R.C. Darton; D. Harrison

Publisher: Elsevier Science
Year: 1975
Tongue: English
Weight: 644 KB
Volume: 30
Category: Article
ISSN: 0009-2509
DOI: 10.1016/0009-2509(75)80030-3

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✦ Synopsis

The paper considers the problems of predicting and correlating gas and liquid hold-ups in-three-phase fluidised beds. It is proposed that Stewart's model, which contains a single unknown parameter k (the mean liquid-wake/bubble volu_me ratio in the bed), should be used in conjunction with Wallis' drift flux approach. Experiments show that k decreases with increasing mean bubble volume in the bed, in a similar way that k decreases with bubble volume for single bubbles. An empirical correlation fdr E is suggested. A plot of gas drift flux as a function of gas hold-up reveals the uniform bubbling and churn-turbulent types of behaviour familiar in gas-liquid two-phase flow. Worked examples illustrate methods of predicting hold-up and bed contraction.

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