MORE ON MIXING OF VISCOUS LIQUIDS IN BUBBLE COLUMNS* |
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Authors: | J. J. Ulbrecht Y. Kawase K. F. Auyeung |
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Affiliation: | a Department of Chemical Engineering, State University of New York at Buffalo, Amherst, New York |
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Abstract: | Four aspects of liquid-phase mixing in semi-batch bubble columns operating with viscous and non-Newtonian liquids were studied: the influence of the central plume on mixing rate, the velocity profiles, the gas hold-up, and the back-mixing. Three regimes of the bubble-induced mixing were identified and associated with the mode of the central plume. One of the modes, due to a moderate gas rate, was found to lead to optimal mixing. Also the gas hold-up and the degree of back-mixing were associated with the central plume mode. A model of the velocity profile proposed earlier was now modified and extended to apply also to the turbulent regime. |
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Keywords: | Bubble columns Mixing Hold-up Non-Newtonian Viscous liquids |
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