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Enhancement of Natural Convection Heat Transfer in Triangular Channels Using Corona Discharge in Nitrogen Gas

[+] Author Affiliations
Majid Molki, Tannaz Harirchian

Southern Illinois University at Edwardsville

Paper No. IMECE2006-13830, pp. 381-391; 11 pages
doi:10.1115/IMECE2006-13830
From:
  • ASME 2006 International Mechanical Engineering Congress and Exposition
  • Heat Transfer, Volume 1
  • Chicago, Illinois, USA, November 5 – 10, 2006
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 0-7918-4784-5 | eISBN: 0-7918-3790-4
  • Copyright © 2006 by ASME

abstract

A computational investigation was conducted to determine the effect of nitrogen corona discharge on enhancement of natural convection heat transfer in a triangular channel. The channel side walls were isothermal, the lower wall was adiabatic, and the fluid was nitrogen gas at atmospheric pressure. The electric field was generated by a positive corona discharge from a charged wire electrode located at the center of the channel. The current-voltage characteristics of the corona discharge was measured for nitrogen and used in the computations. The governing equations of the electric and flow fields were solved by a finite-volume technique. Two different meshes, namely structured and unstructured, were used. In the computations, Rayleigh number and the electrode voltage ranged from 3,737 to 37,377 and from 8.25 to 9.5 kV, respectively. At lower values of the applied voltage, the flow pattern was characterized by the presence of six vortices. At higher voltages, however, the flow pattern changed into a single recirculation that covered the entire cross section of the channel. For the applied voltage of 8.5 kV, heat transfer coefficient was enhanced by 18 to 43.6%, while at 9 kV, the enhancement was 53.5% to 87.3%.

Copyright © 2006 by ASME

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