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Modeling In-Situ Vapor Extraction During Convective Boiling

[+] Author Affiliations
Saran Salakij, James A. Liburdy, Deborah V. Pence

Oregon State University, Corvallis, OR

Paper No. FEDSM2009-78522, pp. 507-518; 12 pages
doi:10.1115/FEDSM2009-78522
From:
  • ASME 2009 Fluids Engineering Division Summer Meeting
  • Volume 2: Fora
  • Vail, Colorado, USA, August 2–6, 2009
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 978-0-7918-4373-4 | eISBN: 978-0-7918-3855-6
  • Copyright © 2009 by ASME

abstract

The pressure drop of convective boiling flow may be reduced by extracting vapor locally since the entire generated vapor does not have to travel through the entire channel length. In this study, the theoretical model was developed to simulate a convective boiling flow through a fractal-like branching microchannel network with vapor extraction. The fractal-like branching microchannel network has a porous membrane forming one wall of the channels. Vapor extraction occurs by applying a vacuum across the membrane. Sample predictive local conditions and global results are presented and discussed. The predicting results are classified into two groups: low inlet flow rate-low heat flux and high inlet flow rate-high heat flux. The results show that to increase extracted vapor mass flow rate, either decreasing supplying extracting pressure or increasing permeability of the porous membrane must be applied. As the amount of vapor extracting increases, the reduction in pressure drop across the channel and the exit vapor quality is achieved.

Copyright © 2009 by ASME
Topics: Vapors , Boiling , Modeling

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