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Effects of exit-condition, gravity, and surface-tension on stability and noise-sensitivity issues for steady condensing flows inside tubes and channels.

Author(s) : PHAN L., WANG X., NARAIN A.

Type of article: Article

Summary

The paper presents accurate numerical solutions of the full 2D governing equations for steady and unsteady laminar/laminar internalcondensing flows of pure vapour (FC-72 and R113) inside a vertical tube and a channel. The film condensation is on the inside wall of atube or one of the walls of a channel (the lower wall in case of a downward sloping channel). Computations find that exit condition specifications are important and are able to characterize the flows' sensitivity or insensitivity to the exit condition (which, in turn, depends upon the flow downstream of the condenser). If well-defined natural steady/quasi-steady flows exist-as is shown to be the case for gravity dominated or strong shear dominated condensate flows that remain parabolic up to the exit location-the computations are able to predict both the natural exit condition and any point of transition (from stable to unstable or smooth to wavy behaviour) that may exist within this zone. Results on the role of surface tension and sensitivity to ever-present minuscule noise of the condensing surface are also reported. [Reprinted with permission from Elsevier. Copyright, 2006].

Details

  • Original title: Effects of exit-condition, gravity, and surface-tension on stability and noise-sensitivity issues for steady condensing flows inside tubes and channels.
  • Record ID : 2006-2821
  • Languages: English
  • Source: International Journal of Heat and Mass Transfer - vol. 49 - n. 13-14
  • Publication date: 2006/07

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