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Effets surprenants des résistances combinées du transfert de masse vapeur et liquide lors de la condensation d'un mélange en dehors des nappes de tubes.

Surprising effects of combined vapour and liquid mass transfer resistances when condensing a mixture outside tube banks.

Auteurs : KARLSSON T., VAMLING L.

Type d'article : Article

Résumé

Detailed calculations are carried out for condensation of a binary zeotropic mixture outside a tube bank to investigate the combined effects of mass transfer resistances in the liquid and vapour phases. The question is how a change in mass transfer resistance in the vapour phase can influence the heat flux. The surprising result was that a decrease in resistance in the vapour phase by reducing the tube pitch, and thus increasing the vapour velocity, reduces the heat flux between 20 and 50% for the conditions studied. This is due to a combination of mass transfer resistance, depletion of the heavy volatile component, and a reduction in the phase interface temperature.

Détails

  • Titre original : Surprising effects of combined vapour and liquid mass transfer resistances when condensing a mixture outside tube banks.
  • Identifiant de la fiche : 2005-1732
  • Langues : Anglais
  • Source : International Journal of Heat and Mass Transfer - vol. 48 - n. 2
  • Date d'édition : 01/2005

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