Effect of oscillatory EHD on the heat transfer performance of a flat plate

Wen Junn Sheu, Jen Jei Hsiao, Chi-Chuan Wang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

The present study investigates the effect of oscillatory EHD on the heat transfer performance of a flat plate. A needle type electrode with positive polarity is used to generate ionic wind with applied voltage ranging from 4 to 9.5 kV. The wave forms of the input voltage are either steady or stepped and the frequency ranges from 0.5 to 2 Hz with the separation distance between the electrode and the test plate being 5 and 15 mm, respectively. It is found that at the same applied voltage, the heat transfer performance subject to the oscillatory EHD is always inferior to that of the steady EHD for all frequencies. A parabolic dependence of the ionic current with the supplied voltage is seen under steady EHD operation. However, the ionic current vs. supplied voltage shows a rather linear dependence pertaining to the oscillatory EHD. For a smaller separation distance of 5 mm, the heat transfer performance for f = 0.5 Hz is slightly higher than that of f = 2 Hz. However, the trend is reversed when the separation distance is increased to 15 mm.

Original languageEnglish
Pages (from-to)419-424
Number of pages6
JournalInternational Journal of Heat and Mass Transfer
Volume61
Issue number1
DOIs
StatePublished - 1 Jun 2013

Keywords

  • Electrohydrodynamics
  • Enhanced convection
  • Ionic wind
  • Oscillatory EHD

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