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Scale‐up of mixing in gassed multi‐turbine agitated vessels

1998; Wiley; Volume: 76; Issue: 3 Linguagem: Inglês

10.1002/cjce.5450760308

1939-019X

Jorge Vasconcelos, Sebastião S. Alves, Alvin W. Nienow, Waldemar Bujalski,

Metallurgical Processes and Thermodynamics

Abstract A mixing model previously developed for the determination of mixing time in gassed tanks stirred by multiple Rushton turbines (Vasconcelos et al., 1995) was verified for the additional scales of 0.39, 0.56 and 0.72 m vessel diameter. It is now shown that the single adjusted parameter previously required by the model, the air‐induced axial velocity parameter v ax , is scale‐independent with an invariant value of 7 × 10 −2 m/s. Model simulations, with tank and turbine diameters and the number of stages as the only required parameters, deviate 5% on average from the experimentally determined mixing time t 0.05 . The model is thus a valuable tool for scale‐up of this type of vessels.