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Electrohydrodynamic motion due to space-charge limited injection of charges in cyclohexane
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.ORCID iD: 0000-0002-6375-6142
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.ORCID iD: 0000-0001-7812-9849
2014 (English)In: Proceedings of the 2014 IEEE 18th International Conference on Dielectric Liquids, ICDL 2014, 2014Conference paper, Published paper (Refereed)
Abstract [en]

A self-consistent numerical model is presented in order to study the electrohydrodynamic (EHD) motion generated by a stationary, space-charge limited injection of charge in the point-plane geometry. In this multiphysics model, the continuity equations for charge carriers and Poisson's equation are coupled with Navier-Stokes equations and the heat equation. This model is used to study the EHD motion of cyclohexane in the negative point-plane geometry for sharp points with tip radius of 0.2 μm. It is shown that the injection of charges from a very sharp point electrode results in the formation of a thin plume with high liquid velocity. The results show large differences in the liquid velocity close to the point electrode compared to the average velocity estimated by the well-known electrohydrodynamic mobility. The difference between the width of the charged core and the hydrodynamic plume is analyzed and presented. It is shown that the local heating of the liquid is strongly reduced by the convective losses generated by EHD motion. Finally, it is found that the liquid temperature in cyclohexane in the vicinitiy of sharp points under space charge limited injection can reach temperatures slightly above boiling temperature, without generating bubbles.

Place, publisher, year, edition, pages
2014.
Series
IEEE International Conference on Dielectric Liquids, ISSN 2153-3725
Keyword [en]
Charge injection, Electrohydrodynamic motion, liquid breakdown, streamer formation, Cyclohexane, Dielectric liquids, Electric space charge, Electrodes, Electrohydrodynamics, Poisson equation, Boiling temperature, Continuity equations, Electrohydrodynamic (EHD), Liquid temperature, Multi-physics modeling, Poisson's equation, Space-charge limited, Navier Stokes equations
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-167961DOI: 10.1109/ICDL.2014.6893115ISI: 000360485100046Scopus ID: 2-s2.0-84907897647ISBN: 9781479920631 (print)OAI: oai:DiVA.org:kth-167961DiVA: diva2:816926
Conference
2014 IEEE 18th International Conference on Dielectric Liquids, ICDL 2014, 29 June 2014 through 3 July 2014
Note

QC 20150604

Available from: 2015-06-04 Created: 2015-05-22 Last updated: 2015-11-27Bibliographically approved

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