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Mixing of liquids in cylindrical storage tanks with side-entering propellers

✍ Scribed by J.A. Wesselingh

Publisher
Elsevier Science
Year
1975
Tongue
English
Weight
665 KB
Volume
30
Category
Article
ISSN
0009-2509

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✦ Synopsis

Model experiments on batch mixing of liquids in cylindrical tanks with side-entering propellers show that two distinct mixing regimes can occur:

(i) At high levels of agitation mixing is mainly a matter of convection and turbulent diffusion.

(ii) At low levels of agitation (the more common case) even small density differences cause the liquids to settle in layers. Mixing then proceeds by a gradual erosion of the interface of the liquids by interfacial waves. This process is very much slower than the first, and also remarkably dependent on the tank and liquid parameters.

A dimensionless correlation is given which allows estimates to be made of mixing times for the more commonly used geometries.

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