Mixing of Liquids in Large Tanks

Abstract

A 1.2 m diameter tank has been used to model the mixing process in large storage tanks equipped with side-entry mixers.Terminal mixing times have been measured as a function of impeller speed, impeller diameter, liquid depth and impeller angle. it is shown that the indicator method for measuring mixing times yields results which are dependent upon the molecular diffusivity of the materials employed. A mathematical model is presented which accounts for this effect, and some of it's predictions have been tested using a 70 mm diameter tank. It is shown that the conductivity method for measuring mixing times gives results which can be used for scale-up using the rule NϒD2 /Τ2 = Const., and this has been tested on a 31 m diameter tank. Measurements have also been made of fluid velocities using a hot film anemometer, and these are shown to be consistent with a simple boundary layer theory.

Divisions: College of Engineering & Physical Sciences > School of Infrastructure and Sustainable Engineering > Chemical Engineering & Applied Chemistry
Additional Information: Copyright © K.G. Doyle, 1974. K.G. Doyle asserts their moral right to be identified as the author of this thesis. This copy of the thesis has been supplied on condition that anyone who consults it is understood to recognise that its copyright rests with its author and that no quotation from the thesis and no information derived from it may be published without appropriate permission or acknowledgement. If you have discovered material in Aston Publications Explorer which is unlawful e.g. breaches copyright, (either yours or that of a third party) or any other law, including but not limited to those relating to patent, trademark, confidentiality, data protection, obscenity, defamation, libel, then please read our Takedown Policy and contact the service immediately.
Institution: Aston University
Uncontrolled Keywords: Mixing,liquids,large tanks
Last Modified: 21 May 2024 08:28
Date Deposited: 08 Dec 2010 09:54
Completed Date: 1974-01
Authors: Doyle, Keith G.

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