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Emulsion processing using the combined electrical and shear forces

Burrill, Nathan Stuart (2015)
M.Res. thesis, University of Birmingham.

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Abstract

The use of electric fields to aid droplet break-up in emulsion manufacture was investigated with the aim designing more advanced processes for reducing droplet size in liquid-liquid systems. Processing conditions, equipment design and fluid properties on droplet break-up and emulsification performance were investigated, with particular emphasis on the effect of the electric field.

Computational modelling established the electrical stresses in a point-and-plane electrospraying configuration, followed by the construction and investigation of custom apparatus. A minimum droplet size when spraying distilled water into air of 370 μm was achieved, which was attributed to a geometric limitation of the system, but the reduction of droplet size correlated with increased electrical stress. Further apparatus based on a Silverson L4RT high-shear mixer was developed to investigate the application of an electrical stress in addition to shear stress. There was not a direct correlation between electric stress and changing droplet size. Instead, the mean droplet sizes were seen to increase when electrical stress was applied, however the droplet size distributions showed that the increase in mean droplet size was an artefact of coalescence, with much smaller droplets being formed as a result at the smaller end of the distribution.

Type of Work:M.Res. thesis.
Supervisor(s):Simmons, Mark J. H. and Fryer, Peter and Greenwood, Richard
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Chemical Engineering
Additional Information:

Embargo until: 31/12/2020

Subjects:TP Chemical technology
Institution:University of Birmingham
ID Code:6126
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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