The effect of charge mode transition on electrohydrodynamic flow in a multistage negative air corona discharge

C. Kim, Jungho Hwang

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

We study the electrohydrodynamic (EHD) flow induced by a multistage negative air corona discharge with two main subjects: unipolar-to-bipolar charge mode transition, mechanism of EHD flow. Charge mode transition is identified through the maximum-current-based numerical analysis of a six-stage cylindrical ionic wind generator, and confirmed by the experimental data. After formulating the degree of charge mode transition β, we discuss how β affects the electric-to-kinetic energy conversion efficiency and the thrust performance of the EHD flow. We suggest 35Td of reduced electric field on the collector surface as the occurrence criterion of charge mode transition. As an essential feature of the multistage EHD flow, the highest negative pressure is created in the intake. Accordingly, air is drawn into the intake and subsequent flow climbs up a positive static pressure slope, and exhausted into the atmosphere with a high linearity. We explain the physical mechanism of this interesting flow pattern using the first-principle based analysis.

Original languageEnglish
Article number465204
JournalJournal of Physics D: Applied Physics
Volume45
Issue number46
DOIs
Publication statusPublished - 2012 Nov 21

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Electrohydrodynamics
electrohydrodynamics
electric corona
Discharge (fluid mechanics)
air
Air
Energy conversion
Kinetic energy
Flow patterns
static pressure
energy conversion efficiency
Conversion efficiency
Numerical analysis
thrust
accumulators
Electric fields
numerical analysis
linearity
flow distribution
generators

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

Cite this

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