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Etudes sur la chute de pression d'un écoulement diphasique dans un tube vertical chauffé uniformément à des pressions allant jusqu'au point critique.

Pressure drop studies on two-phase flow in a uniformly heated vertical tube at pressures up to the critical point.

Auteurs : VIJAYARANGAN B. R., JAYANTI S., BALAKRISHNAN A. R.

Type d'article : Article

Résumé

Measurements of two-phase flow pressure drop have been made during a phase-change heat transfer process with refrigerant (R-134a) as a working fluid for a wide range of pressures right up to the critical pressure. The experiments were conducted in a uniformly heated vertical tube of 12.7 mm internal diameter and 3 m length over a heat flux range of 35-80 kW/m2, mass flux range of 1200-2000 kg/m2 s, exit quality range of 0.19-0.81 and for reduced pressures ranging from 0.24 to 1 with a fixed inlet subcooling of 3°C. The measurements were compared with the predictions from the homogeneous flow model, a separated flow model using correlations drawn from the literature for void fraction and frictional pressure drop, and finally, using a flow pattern-based predictive method accounting specifically for bubbly, slug and annular flow regimes. It was found that the best results were obtained with the flow pattern-based approach with a mean deviation of plus or minus 20% over the entire pressure range. [Reprinted with permission from Elsevier. Copyright, 2006].

Détails

  • Titre original : Pressure drop studies on two-phase flow in a uniformly heated vertical tube at pressures up to the critical point.
  • Identifiant de la fiche : 2007-1967
  • Langues : Anglais
  • Source : International Journal of Heat and Mass Transfer - vol. 50 - n. 9-10
  • Date d'édition : 05/2007

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