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Document IIF

Tension superficielle du bromure de lithium en présence d'additifs augmentant le transfert de chaleur et de masse : effet du transfert de vapeur supplémentaire.

Surface tension of aqueous lithium bromide with heat mass transfer enhancement additives: the effect of additive vapour transport.

Auteurs : KULANKARA S., HEROLD K. E.

Type d'article : Article, Article de la RIF

Résumé

Heat mass transfer enhancement additives used in aqueous lithium bromide absorption chillers are surfactants that lower the surface tension of the working fluid. It has long been speculated that the surface tension characteristics are a key to the enhancement but the point is controversial because some surfactants do not provide enhancement. In the present study, the surface tension of aqueous lithium bromide was measured, with and without various surfactants additives, using a drop weight method. Measurements were also made on water, with and without an additive. The results provide new information that clarifies several confusing aspects of the literature data. The major result is the realization that the surface tension of aqueous lithium bromide is strongly affected by the presence of surfactant vapour around the liquid interface. This apparently explains the large differences in surface tension data found in the literature since no previous studies mentioned the importance of the vapour conditions.

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Format PDF

Pages : 383-389

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Détails

  • Titre original : Surface tension of aqueous lithium bromide with heat mass transfer enhancement additives: the effect of additive vapour transport.
  • Identifiant de la fiche : 2003-0156
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 25 - n. 3
  • Date d'édition : 05/2002

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