DocumentCode :
228981
Title :
Electrohydrodynamic motion due to space-charge limited injection of charges in cyclohexane
Author :
Becerra, Marley ; Frid, Henrik
Author_Institution :
Sch. of Electr. Eng., R. Inst. of Technol. (KTH), Stockholm, Sweden
fYear :
2014
fDate :
June 29 2014-July 3 2014
Firstpage :
1
Lastpage :
4
Abstract :
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.
Keywords :
Navier-Stokes equations; Poisson equation; convection; electrohydrodynamics; flow simulation; numerical analysis; organic compounds; Navier-Stokes equations; Poisson equation; average velocity; boiling temperature; charge carriers; charged core width; continuity equations; convective losses; cyclohexane electrohydrodynamic motion; electrohydrodynamic mobility; heat equation; hydrodynamic plume; liquid temperature; liquid velocity; local heating; multiphysics model; negative point-plane geometry; self-consistent numerical model; sharp point vicinity; stationary space-charge limited injection; thin plume formation; tip radius; very sharp point electrode; Fluids; Ionization; Laplace equations; RNA; TV; Charge injection; Electrohydrodynamic motion; liquid breakdown; streamer formation;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Dielectric Liquids (ICDL), 2014 IEEE 18th International Conference on
Conference_Location :
Bled
Type :
conf
DOI :
10.1109/ICDL.2014.6893115
Filename :
6893115
Link To Document :
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