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Amélioration du transfert de chaleur et de masse lors de l'absorption de H2O-LiBr et NH3-H2O, grâce à des additifs.

Heat and mass transfer enhancement by additives in absorptions of H2O-LiBr and NH3-H2O.

Auteurs : CHENG W. L., ZHAO R., SHI M., et al.

Résumé

The surface tensions of both aqueous LiBr and aqueous ammonia in the presence of additives were measured. The effects of additives on absorption of vapour into vertical falling aqueous LiBr film, absorption of vapour into aqueous LiBr in a static pool, and absorption of ammonia vapour bubble into NH3-H2O were studied by experimental methods, respectively. The experimental results showed that the heat and mass transfer performance was significantly enhanced with additives (2-EH, n-octanol etc.) in the process of both the aqueous LiBr absorption and the ammonia bubble absorption. The enhancement mechanisms of additives on aqueous LiBr absorption has been concluded in that additives in the liquid phase is absorbed by aqueous LiBr on the liquid side of the liquid-vapour-interface, so is the vapour phase on the vapour side, which generates surface tension gradient, then causes Marangoni convection at the interface, and consequently results in the enhancement of the heat and mass transfer during the absorption process.

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Format PDF

Pages : ICR07-B1-1507

Disponible

  • Prix public

    20 €

  • Prix membre*

    Gratuit

* meilleur tarif applicable selon le type d'adhésion (voir le détail des avantages des adhésions individuelles et collectives)

Détails

  • Titre original : Heat and mass transfer enhancement by additives in absorptions of H2O-LiBr and NH3-H2O.
  • Identifiant de la fiche : 2008-0176
  • Langues : Anglais
  • Source : ICR 2007. Refrigeration Creates the Future. Proceedings of the 22nd IIR International Congress of Refrigeration.
  • Date d'édition : 21/08/2007

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