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Transient Heat Transfer Response During Application of an Electric Field in Convective Boiling of R-404A in a Horizontal Smooth Tube

[+] Author Affiliations
James E. Bryan

University of Missouri, Columbia, MO

Paper No. IMECE2003-41564, pp. 49-54; 6 pages
  • ASME 2003 International Mechanical Engineering Congress and Exposition
  • Heat Transfer, Volume 4
  • Washington, DC, USA, November 15–21, 2003
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 0-7918-3718-1 | eISBN: 0-7918-4663-6, 0-7918-4664-4, 0-7918-4665-2
  • Copyright © 2003 by ASME


The influence of mass flux and applied voltage on the transient heat transfer response in convective boiling of R-404A in a horizontal smooth tube was investigated. Electrohydrodynamic (EHD) forces generated both enhancement and suppression in the heat transfer. Upon application of a DC electric field, enhancement or suppression of heat transfer varied significantly until the convective boiling process reached steady state. The initial enhancement or suppression depended on the electric field strength and the momentum of the flow. The electric current was studied to determine the contributing terms of the EHD force. Results are presented showing that heat transfer can be significantly enhanced or suppressed within 15 seconds of electric field application. Finally, the potential of using time varying electric fields to enhance and/or control two-phase heat transfer is discussed.

Copyright © 2003 by ASME



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