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Flow behaviour of dielectric liquids in an electric field

Zhang, HB; Edirisinghe, MJ; Jayasinghe, SN; (2006) Flow behaviour of dielectric liquids in an electric field. J FLUID MECH , 558 103 - 111. 10.1017/S0022112006000188. Green open access

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Abstract

A family of 10 silicone oils with electrical conductivity similar to 10(-13) S m(-1) (a regime hitherto systematically unexplored) and viscosities ranging from 1 to 2000mPas have been Subjected to an electrical field of up to 1.5kV mm(-1) during flow from a needle. The flow behaviour of these liquids is investigated experimentally in the flow rate regime 10(-8)-10(-12) m(3) s(-1) and we analyse the results using the Ohnesorge number. Due to the low electrical conductivity and high electrical relaxation time of the silicone oils, only unsteady transient jets were found. The onset of this type of jetting has been defined using current measurements and, in contrast to conducting liquids, the non-dimensional jet diameter increases with increase in Ohnesorge number. The time elapsed between the start and finish of jetting increases with increasing Ohnesorge number.

Type:Article
Title:Flow behaviour of dielectric liquids in an electric field
Open access status:An open access version is available from UCL Discovery
DOI:10.1017/S0022112006000188
Publisher version:http://dx.doi.org/10.1017/S0022112006000188
Language:English
Additional information:© 2006 Cambridge University Press
Keywords:HIGHLY VISCOUS-LIQUIDS, ELECTROSTATIC ATOMIZATION, SCALING LAWS, ELECTROSPRAY, DROPLETS, JETS
UCL classification:UCL > School of BEAMS > Faculty of Engineering Science > Mechanical Engineering

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