Instability of the orientation of a speroidal particle in a leaky dielectric medium in the AC electric field

Yu Dolinsky, T. Elperin

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

We study a system consisting of an ellipsoidal particle with permittivity ε2 and conductivity σ2 immersed into a host medium with permittivity ε1 and conductivity σ1 in the AC external electric field with a strength E0 and frequency ω. We determined conditions when 1) orientation of a spheroidal particle with a finite electric conductivity at t → ∞ coincides with the orientation of the ideal dielectric spheroid; 2) orientation of a spheroid at t → ∞ is normal to the orientation of the ideal dielectric spheroid and 3) orientation of particle is not affected by the external electric field. We found the direct connection between the final orientation of the particle and the existence of two time intervals, T 1 (ω) and T2 (ω), such that during time interval T1 an equilibrium orientation of the particle is the same as the equilibrium orientation of an ideal dielectric particle while during time interval T2 the direction of the stable equilibrium orientation is normal to the equilibrium orientation of an ideal dielectric particle. The values T1 and T2 depend on the frequency of the external field ω, and T = T1(ω)+ T2(ω), where T = 2π/ω.

Original languageEnglish
Title of host publicationCHISA 2006 - 17th International Congress of Chemical and Process Engineering
StatePublished - 1 Dec 2006
EventCHISA 2006 - 17th International Congress of Chemical and Process Engineering - Prague, Czech Republic
Duration: 27 Aug 200631 Aug 2006

Publication series

NameCHISA 2006 - 17th International Congress of Chemical and Process Engineering

Conference

ConferenceCHISA 2006 - 17th International Congress of Chemical and Process Engineering
Country/TerritoryCzech Republic
CityPrague
Period27/08/0631/08/06

ASJC Scopus subject areas

  • Chemical Engineering (all)

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