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Simulation numérique de la convection de Marangoni dans du Li-Br aqueux absorbant.

Numerical simulation of Marangoni convection within absorptive aqueous Li-Br.

Numéro : AB-SI1-1135

Auteurs : GIANNETTI N., YAMAGUCHI S., SAITO K.

Résumé

The Marangoni convection effect within absorptive films can be described as the behaviour that brings the boundary between adjoining phases to relapse into a state where the interfacial free energy is minimized as a consequence of the expansion and the contraction of the regions with low and high surface tension. Thus, surface tension gradients lead to a shear stress originating a fluid motion in proximity of the interface and consequently affecting the contingent heat and mass transfer process. However, since the mechanism by which the related transport phenomena can be enhanced has not been clearly understood, neither the upper limit to the benefit provided nor the best surfactant additive are currently known. This work formulates a numerical model of the fundamental governing equations in two dimensions and presents a first screening of the model results. Different interfacial boundary conditions are analysed in a way useful to provide a direct comparison of the present results with the measurements from a nearly two-dimensional apparatus and to clarify the driving force of Marangoni convection and the related transfer performance enhancement.

Détails

  • Titre original : Numerical simulation of Marangoni convection within absorptive aqueous Li-Br.
  • Identifiant de la fiche : 30022718
  • Langues : Anglais
  • Source : International sorption heat pump conference, ISHPC 2017, Tokyo august 7-10.
  • Date d'édition : 07/08/2017

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