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Numerical solution of film condensation from turbulent flow of vapour-gas mixtures in vertical tubes.

Author(s) : GROFF M. K., ORMISTON S. J., SOLIMAN H. M.

Type of article: Article

Summary

A complete two-phase model is presented for film condensation from turbulent downward flow of vapour-gas mixtures in a vertical tube. The model solves the complete parabolic governing equations in both phases including a model for turbulence in each phase, with no need for additional correlation equations for interfacial heat and mass transfer. A finite volume method is used to form the discretized mean flow equations for conservation of mass, momentum, and energy. A fully coupled solution approach is used with a mesh that automatically adapts to the changing film thickness. The results of using three turbulence models involving combinations of mixing length and k-e models in the film and mixture regions are compared. This new model is extensively compared with previous numerical and experimental studies. In the experimental comparisons, it was found that a model consisting of a k-e turbulence model for both the film and the mixture flows produced the best agreement. Results are also presented for a parametric study of condensation from steam-air mixtures. The effects of changes to the inlet Reynolds number, the inlet gas mass fraction, and the inlet-to-wall temperature difference on the film thickness and heat transfer are presented and discussed. Local profiles of axial velocity, temperature, and gas mass fraction are also presented. [Reprinted with permission from Elsevier. Copyright, 2007].

Details

  • Original title: Numerical solution of film condensation from turbulent flow of vapour-gas mixtures in vertical tubes.
  • Record ID : 2008-0538
  • Languages: English
  • Source: International Journal of Heat and Mass Transfer - vol. 50 - n. 19-20
  • Publication date: 2007/09

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