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Electrocoalescence in non-uniform electric fields: An experimental study

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Title Electrocoalescence in non-uniform electric fields: An experimental study
 
Creator MHATRE, S
THAOKAR, R
 
Subject IN-OIL EMULSION
DROP COALESCENCE
WATER
DEMULSIFICATION
SEPARATION
Electrocoalescence
Phase separation
Crude oil demulsification
Electrohydrodynamics
Non-uniform electric field
Dielectrophoresis
 
Description The method of electrostatic force-assisted phase separation is widely used in the chemical industry. The fast and clean separation capabilities make electrocoalescence a favorite among the other competing phase separation techniques. In the present study, we experimentally investigated the relative merits of symmetric and asymmetric non-uniform and uniform electric fields in electrocoalescence. Three different types of emulsions are studied: (i) a perfectly conducting (PC) phase dispersed in a perfectly dielectric (PD) medium, (ii) a leaky dielectric (LD) phase dispersed in another LD phase of higher electrical conductivity, and (iii) a LD phase dispersed in another LD phase of lower electrical conductivity. The coalescence behavior of each emulsion in the non-uniform electric fields is analyzed and the results are compared with that in a uniform field. The observations show that a non-uniformity as well as asymmetry of electric field can affect electrocoalescence in a nontrivial way and is sensitive to the drop-medium system, specifically pin-plate, quadrupole and annular electrode configurations are found to be advantageous over uniform field in PC drops in PD medium, less conducting LD drops in more conducting LD medium and more conducting LD drops in less conducting LD medium, respectively. (C) 2015 Elsevier B.V. All rights reserved.
 
Publisher ELSEVIER SCIENCE SA
 
Date 2016-01-14T13:16:33Z
2016-01-14T13:16:33Z
2015
 
Type Article
 
Identifier CHEMICAL ENGINEERING AND PROCESSING, 96,28-38
0255-2701
1873-3204
http://dx.doi.org/10.1016/j.cep.2015.07.025
http://dspace.library.iitb.ac.in/jspui/handle/100/17592
 
Language en