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Direct Simulations of Mixing of Liquids With Density and Viscosity Differences

Direct Simulations of Mixing of Liquids With Density and Viscosity Differences, J. J. Derksen. Industrial & Engineering Chemistry Research 2012, 51  (19), 6948–6957.

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Abstract

Simulations of flow and scalar transport in stirred tanks operated in transitional and mildly turbulent regimes (Re = 3000-12000) are presented. The moderate Reynolds numbers allow the flow to be simulated directly, without the use of turbulence closure or subgrid-scale models. The Newtonian liquids that are blended have different densities and/or viscosities, and the emphasis is on how these differences affect mixing times. The density difference is characterized by a Richardson number (Ri) that varies in the range of 0-0.5. The kinematic viscosity ratio is between 1 and 4. The results show that mixing times increase steeply with increasing Ri and that changing the tank layout can partly mitigate this effect. The viscosity ratio has a much weaker influence on the mixing time.

BibTeX

@article{ ISI:000304027700039,
Author = {Derksen, J. J.},
Title = {Direct Simulations of Mixing of Liquids With Density and Viscosity Differences},
Journal = {Industrial \& Engineering Chemistry Research},
Year = {2012},
Volume = {51},
Number = {19},
Pages = {6948-6957},
Month = {},
Abstract = {Simulations of flow and scalar transport in stirred tanks operated in transitional and mildly turbulent regimes (Re = 3000-12000) are presented. The moderate Reynolds numbers allow the flow to be simulated directly, without the use of turbulence closure or subgrid-scale models. The Newtonian liquids that are blended have different densities and/or viscosities, and the emphasis is on how these differences affect mixing times. The density difference is characterized by a Richardson number (Ri) that varies in the range of 0-0.5. The kinematic viscosity ratio is between 1 and 4. The results show that mixing times increase steeply with increasing Ri and that changing the tank layout can partly mitigate this effect. The viscosity ratio has a much weaker influence on the mixing time.},
DOI = {10.1021/ie3000419},
ISSN = {0888-5885},
Unique-ID = {ISI:000304027700039},
}

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