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Study on Drop Wise Condensation by Using Functionalized Heat Transfer Surface

[+] Author Affiliations
Yasuo Koizumi

Japan Atomic Energy Agency, Tokai, Ibaraki, JapanShinshu University, Ueda, Nagano, Japan

Shota Yoshizawa

Shinshu University, Ueda, Nagano, Japan

Paper No. IMECE2014-37400, pp. V08BT10A059; 7 pages
doi:10.1115/IMECE2014-37400
From:
  • ASME 2014 International Mechanical Engineering Congress and Exposition
  • Volume 8B: Heat Transfer and Thermal Engineering
  • Montreal, Quebec, Canada, November 14–20, 2014
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4956-9
  • Copyright © 2014 by ASME

abstract

Condensation heat transfer experiments were performed by using steam at 0.1 MPa The enhancement of drop wise condensation heat transfer by functionalizing a heat transfer surface was examined. A gold-plated surface was used to produce the drop wise condensation. Grooved heat transfer surfaces were adopted to functionalize the heat transfer surface. The shape and the size of the grooves were rectangular and 2 mm × 2 mm × 2 mm, 3 mm × 3 mm × 3 mm and 2 mm × 3 mm × 2 mm (groove depth × groove top part width × groove bottom width), respectively. The heat flux of the grooved surface was larger than that of the plain gold-plated surface. When the groove size was 2 mm × 2 mm × 2 mm and the top parts and the walls of grooves were plated with gold, the heat transfer rate augmentation was highest; the augmentation rate was 1.53. Since to increase the width of the top part of the grooves tends to bring the quality of the surface structure close to the plain surface, to increase the top width of the grooves is not right direction. It was also implied that to make summits and troughs on the surface tends to expose the summit part to steam more, which might result in the heat transfer augmentation.

Copyright © 2014 by ASME

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