Prediction of just suspended speed for mixed slurries at high solids loadings

Date

2013-02-01

Author

Ayrancı Tansık, İnci
Etchells, Arthur W.
Kresta, Suzanne M.

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One design heuristic used to determine the just suspended speed, N-js, for mixed slurries assumes that the mixture N-js is dominated by the particle phase with the maximum N-js. This approach does not incorporate the effect of the second solid phase. Two new models are proposed to predict the mixture N-js: the power model and the momentum model. These models determine the mixture N-js using the sum of the power or the sum of the momentum required to suspend the individual solid phases. The models were tested using experimental data for two impellers, a Lightnin A310 impeller and a 45 degrees pitched-blade turbine. A range of off-bottom clearances, and six mixtures of solids up to 27 wt% solids loading completed the data set. The power model accurately predicts mixture N-js for both impellers over the full range of clearances and up to 27 wt% mixtures. (c) 2012 The Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.

Subject Keywords

Just suspended speed, Stirred tank, Power model, Momentum model, Mixture, High solids loading

URI

https://hdl.handle.net/11511/34714

Journal

CHEMICAL ENGINEERING RESEARCH & DESIGN

DOI

https://doi.org/10.1016/j.cherd.2012.08.002

Collections

Department of Chemical Engineering, Article

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Citation Formats

İ. Ayrancı Tansık, A. W. Etchells, and S. M. Kresta, “Prediction of just suspended speed for mixed slurries at high solids loadings,” CHEMICAL ENGINEERING RESEARCH & DESIGN, pp. 227–233, 2013, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/34714.