Imperial College London
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Professor Omar K. Matar, FREng

Faculty of Engineering, Department of Chemical Engineering

Head of Department of Chemical Engineering
 
 
 
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Contact

 

+44 (0)20 7594 9618o.matar Website

 
 
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Assistant

 

Mr Avery Kitchens +44 (0)20 7594 6263

 
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Location

 

305 ACEACE ExtensionSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Liang:2022:10.1017/flo.2022.27,
author = {Liang, F and Kahouadji, L and Valdes, JP and Shin, S and Chergui, J and Juric, D and Matar, OK},
doi = {10.1017/flo.2022.27},
journal = {Flow: Applications of Fluid Mechanics},
pages = {1--19},
title = {Numerical study of oil–water emulsion formation in stirred vessels: effect of impeller speed},
url = {http://dx.doi.org/10.1017/flo.2022.27},
volume = {2},
year = {2022}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The mixing of immiscible oil and water by a pitched blade turbine in a cylindrical vessel is studied numerically. Three-dimensional simulations combined with a hybrid front-tracking/level-set method are employed to capture the complex flow and interfacial dynamics. A large eddy simulation approach, with a Lilly–Smagorinsky model, is employed to simulate the turbulent two-phase dynamics at large Reynolds numbers  Re=1802−18 026 . The numerical predictions are validated against previous experimental work involving single-drop breakup in a stirred vessel. For small  Re , the interface is deformed but does not reach the impeller hub, assuming instead the shape of a Newton's Bucket. As the rotating speed increases, the deforming interface attaches to the impeller hub which leads to the formation of long ligaments that subsequently break up into small droplets. For the largest  Re  studied, the system dynamics becomes extremely complex wherein the creation of ligaments, their breakup and the coalescence of drops occur simultaneously. The simulation outcomes are presented in terms of spatio-temporal evolution of the interface shape and vortical structures. The results of a drop size analysis in terms of the evolution of the number of drops, and their size distribution, is also presented as a parametric function of  Re .
AU  - Liang,F
AU  - Kahouadji,L
AU  - Valdes,JP
AU  - Shin,S
AU  - Chergui,J
AU  - Juric,D
AU  - Matar,OK
DO  - 10.1017/flo.2022.27
EP  - 19
PY  - 2022///
SN  - 2633-4259
SP  - 1
TI  - Numerical study of oil–water emulsion formation in stirred vessels: effect of impeller speed
T2  - Flow: Applications of Fluid Mechanics
UR  - http://dx.doi.org/10.1017/flo.2022.27
UR  - https://www.cambridge.org/core/journals/flow/article/numerical-study-of-oilwater-emulsion-formation-in-stirred-vessels-effect-of-impeller-speed/B9C6E37D8FF5360B4A16ACB6A2CC9EA1
UR  - http://hdl.handle.net/10044/1/101443
VL  - 2
ER  -
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