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Caractéristiques et visualisation d'un flux critique de R-134a dans une géométrie annulaire verticale avec des grilles d'espacement.

The characteristics and visualization of critical heat flux of R-134a flowing in a vertical annular geometry with spacer grids.

Auteurs : LEE K. L., BANG I. C., CHANG S. H.

Type d'article : Article

Résumé

In this paper, critical heat flux (CHF) experiments of forced convection boiling were performed to investigate the CHF characteristics of a vertical annular channel with one heated rod and four spacer grids for new refrigerant R-134a. The experiments were conducted under outlet pressure of 11.6, 13, 16 and 20 bar, mass fluxes of 100-600 kg/m2.s, and inlet temperatures of 25-40°C. The parametric trend of the CHF data was well consistent with previous understanding in water. The comparison between the present results with effect of the flow obstacle enhancing CHF and water data in similar geometry shows R-134a can be a modelling fluid for simulating water CHF in high pressure and high temperature condition even for annular geometry. The direct observation of flowing bubble behaviours contributes to enhancing our understanding on the effect of flow obstacles for flow boiling heat transfer. [Reprinted with permission from Elsevier. Copyright, 2007].

Détails

  • Titre original : The characteristics and visualization of critical heat flux of R-134a flowing in a vertical annular geometry with spacer grids.
  • Identifiant de la fiche : 2008-1218
  • Langues : Anglais
  • Source : International Journal of Heat and Mass Transfer - vol. 51 - n. 1-2
  • Date d'édition : 01/2008

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