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Experimental Study on Embedded-Wire Electrode for EHD-Enhanced Condensation in a Shell/Tube Bundle Heat Exchanger

[+] Author Affiliations
J. Wu, M. M. Ohadi, S. Dessiatoun, J. Qi

University of Maryland

Paper No. IMECE2005-81815, pp. 311-315; 5 pages
doi:10.1115/IMECE2005-81815
From:
  • ASME 2005 International Mechanical Engineering Congress and Exposition
  • Heat Transfer, Part B
  • Orlando, Florida, USA, November 5 – 11, 2005
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 0-7918-4222-3 | eISBN: 0-7918-3769-6
  • Copyright © 2005 by ASME

abstract

In this study, EHD-enhanced external condensation heat transfer was studied experimentally using a new type of wire electrode. The tube bundle consisted of twenty-four state of the art enhanced condensation tubes, provided by a heat transfer tube manufacturer. Thin wires embedded into a plastic board at a designated spacing formed the new electrode structure. The electrode board was inserted between the tube columns of the bundle to utilize the EHD effect while also preventing flooding of the lower tubes of the bundle with the condensate from the upper tubes, thus reducing the adverse bundle effect. For the tests reported, up to 60% enhancement in the external heat transfer coefficient was achieved at an applied EHD voltage of 19 kV. When compared to the Printed Circuit Board (PCB) electrode reported in our earlier studies, the embedded wire electrode (EWE) yielded better performance.

Copyright © 2005 by ASME

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