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Further observations on the scale-up of aerated mixing vessels

✍ Scribed by K. Chandrasekharan; P.H. Calderbank

Publisher: Elsevier Science
Year: 1981
Tongue: English
Weight: 391 KB
Volume: 36
Category: Article
ISSN: 0009-2509
DOI: 10.1016/0009-2509(81)85033-6

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✦ Synopsis

The unsteady-state rate of dissolution of oxygen in water was used to measure k,a in a large aerated mixing vessel. Results are compared with those previously observed in smaller, geometricatfy similar vessels, from which it is found that the problem of scale-up with equal mass-transfer rates is complex and difficult lo resolve on the laboratory scale. However, it is apparent that scale-up with geometric similarity results in a marked sacrifice in performance.

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Values of the mass transfer product. kLn, have been determmed usmg unsteady state measurements of oxygen dlssolutlon rates m water, m 0 60 m3 and 0 043 m3 bailled mlxmg vessels fitted wtth geometncally sunllar flat-bladed turbmes and spargers It was seen that the assumption of quasi steady-state m t