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Evaporation du coté calandre dans un échangeur de chaleur de type TEMA E : modèles d'écoulement et transitions.

Shellside evaporation in a TEMA E-shell: flow patterns and transitions.

Auteurs : DOO G., MCNAUGHT J. M., DEMPSTER W. M.

Type d'article : Article

Résumé

This article describes some results from a research programme to study forced flow shellside boiling in a TEMA E-type shell and tube heat exchanger. It focuses on the particular issue of the effect of apparent transitions in the two-phase flow pattern. The results from the programme show a drop in the heat transfer performance at lower mass fluxes and higher vapour qualities. The sudden drop in performance may be caused by a change in the two-phase flow pattern on the shellside from a homogeneous type to a stratified type of flow with separation of the liquid and vapour phases. Support for this conclusion is that the transition in heat transfer performance appears to coincide with a change in the behaviour of the measured two-phase pressure drop multiplier. A model is described which allows for the effects of separated flow and also attempts to predict the apparent transition in the two-phase flow pattern.

Détails

  • Titre original : Shellside evaporation in a TEMA E-shell: flow patterns and transitions.
  • Identifiant de la fiche : 2004-2752
  • Langues : Anglais
  • Source : Applied Thermal Engineering - vol. 24 - n. 8-9
  • Date d'édition : 06/2004

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