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Document IIF

Etude sur l'effet d'un champ magnétique sur l'absorption à ammoniac-eau avec film tombant à l'extérieur d'un tube vertical.

A study on the effect of magnetic field on falling film absorption outside vertical tube with ammonia-water.

Auteurs : NIU X. F., DU K., CHEN T., et al.

Résumé

Ammonia-water absorption refrigeration system has much more superiority in environmental protection and energy saving. However the COP of ammonia-water absorption refrigeration system is relatively low. Absorption enhancement is an effective way to improve COP of ammonia-water absorption refrigeration system. In this study, magnetic field was employed in the falling film absorption outside vertical tube with ammonia-water. Firstly, the mathematical model of ammonia-water falling film absorption in magnetic field has been built up. Magnetic field force was introduced to the mathematical model. In the process of modelling, the variation of falling film thickness, the variation of physical characteristics of ammonia-water and the convection in the direction of the film thickness were considered. The distribution of temperature, velocity and concentration in falling film were acquired through numerical derivation. Then, the micro mechanism of effect on ammonia-water solution and its absorption was analyzed. The numerical results show that the velocity along falling, the thickness and the concentration of falling filmall increased in magnetic field. The micro mechanism analysis show that external magnetic field will increase the activity of solution. External magnetic field has positive effect on the falling absorption of ammonia-water.

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Format PDF

Pages : ICR07-B1-378

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 : A study on the effect of magnetic field on falling film absorption outside vertical tube with ammonia-water.
  • Identifiant de la fiche : 2007-2586
  • 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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