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Condensation of multicomponent mixtures in a vertical tube: theoretical analysis and numerical solution.

Author(s) : BOTSCH T. W., STEPHAN K.

Summary

A model describing the condensation process of multicomponent mixtures in a vertical tube is presented. The model can be used under steady-state as well as during unsteady conditions. The model is based on the film theory. It assumes equilibrium only at the interface but not in the bulk liquid or vapour phase. The material and energy balances for gas and liquid phase are derived under consideration of the heat and material fluxes between the phases. Local heat transfer coefficients for the condensate and the gas film are calculated along the tube. The material transfer process through the gas film is described by the Maxwell-Stefan equation. These are transferred into a set of algebraic equations and solved simultaneously with the material and energy balances as well as with all other required equations. A validation of the derived model is carried out for the steady-state by comparing the calculated condensation rates, gas temperature and concentrations with experimental data from the literature. The concentration profile over the gas film and some simulation results describing the behaviour of the system under transient conditions are discussed.

Details

  • Original title: Condensation of multicomponent mixtures in a vertical tube: theoretical analysis and numerical solution.
  • Record ID : 1997-0145
  • Languages: English
  • Source: Proceedings of the 2nd European Thermal-Sciences (EUROTHERM) and 14th UIT National Heat Transfer Conference 1996.
  • Publication date: 1996/05/29
  • Document available for consultation in the library of the IIR headquarters only.

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