Maximum spreading of electrically charged droplets impacting on dielectric substrates

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In this work, the electric charging effect oil the spreading of droplet impacting oil dielectric substrates has been investigated. The charged water droplets were directed oil the paraffin wax and the Teflon-coated plates. The impinging behavior was Visualized and recorded using a CCD camera to identify the maximum extent of the flattened droplets. Droplet diameter and velocity approaching the wall were measured as well. The diameter of the electrically charged droplet at the maximum spread turned out to be larger compared to that of neutral droplet (at the maximum spread), and the difference becomes larger with increasing of the electric charge ratio (defined as the ratio of the actual electric charge to the Rayleigh limit). This phenomenon is considered to be due to reduction of effective interfacial tensions between the liquid and the gas and between the liquid and the solid by electric charging. Finally, an improved model was proposed to predict the maximum spreading ratio for electrically charged droplets by introducing correlations oil the liquid-gas and the liquid-solid interfacial tensions. (C) 2008 Elsevier Ltd. All rights reserved.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2009-01
Language
English
Article Type
Article
Keywords

INTERFACIAL ENERGIES; SOLID-SURFACE; CONTACT-ANGLE; TENSION; DROPS

Citation

INTERNATIONAL JOURNAL OF MULTIPHASE FLOW, v.35, no.1, pp.1 - 7

ISSN
0301-9322
DOI
10.1016/j.ijmultiphaseflow.2008.09.003
URI
http://hdl.handle.net/10203/14480
Appears in Collection
ME-Journal Papers(저널논문)
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