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Flow Stability of Laminar Supercritical CO2 Sudden Expansion Flow With Field Synergy Principle

[+] Author Affiliations
Bi-Li Deng, Xin-Rong Zhang

Peking University, Beijing, China

Paper No. IHTC14-22464, pp. 533-538; 6 pages
doi:10.1115/IHTC14-22464
From:
  • 2010 14th International Heat Transfer Conference
  • 2010 14th International Heat Transfer Conference, Volume 2
  • Washington, DC, USA, August 8–13, 2010
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 978-0-7918-4937-8 | eISBN: 978-0-7918-3879-2
  • Copyright © 2010 by ASME

abstract

Forced convection of two-dimensional supercritical CO2 flow in plane symmetric sudden expansion duct is investigated numerically in this paper. Simulations were conducted under three wall boundary conditions, i.e., heating, cooling and isothermal, at low Reynolds numbers. Critical Reynolds numbers above which flow asymmetric occurs were examined under each condition. Results of the isothermal case agree well with previous numerical results. However, Compared with the isothermal case, smaller critical Reynolds numbers are found under both of heating and cooling conditions. In addition, the critical Reynolds numbers decrease with the increasing of heating/cooling intensity each under these two conditions. Furthermore, a new concept from the viewpoint of field synergy is introduced to illustrate this phenomenon of the reduction of flow stability.

Copyright © 2010 by ASME

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