JOURNAL OF CHEMICAL ENGINEERING OF JAPAN
Print ISSN : 0021-9592
Original Papers
A New Perspective for the Mixing of Yield Stress Fluids with Anchor Impellers
F. BertrandP. A. TanguyE. Brito-De La Fuente
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JOURNALS FREE ACCESS

1996 Volume 29 Issue 1 Pages 51-58

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Abstract

The mixing of yield stress fluids with an anchor impeller is investigated numerically in the laminar regime using a three-dimensional finite element method. First, it is shown that the flow behavior is strongly influenced by the level of viscoplasticity and that mixing is rather inefficient in such a case. Next, correlations of the power number versus the Reynolds number are presented for different values of the Bingham number. In particular, it is established that the Metzner-Otto concept remains valid for fluid exhibiting a yield stress and that the Metzner and Otto constant (Ks) varies slightly over a wide range of Bingham numbers (Bi ≤ 75M). Finally, the 25-year old experimental findings of Nagata are reviewed and clarified.

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© 1996 The Society of Chemical Engineers, Japan
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