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Etudes sur le flux thermique critique lors de l'ébullition en écoulement des pressions proches de la pression critique.

Studies on critical heat flux in flow boiling at near critical pressures.

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

Type d'article : Article

Résumé

Experimental studies on critical heat flux (CHF) have been conducted in a uniformly heated vertical tube of 12.7 mm internal diameter and 3 m length at different reduced pressures ranging from 0.24 to 0.99 with R134a as the working fluid. The onset of CHF was determined by the sudden rise in the wall temperature of the electrically heated tube. Experiments were performed over a wide range of parameters: mass flux values from 200 to 2000 kg/m2.s, pressure from 10 to 39.7 bars and heat flux from 2 to 80 kW/m2 and exit quality from 0.17 to 0.94. The results show considerably lower critical heat flux at high pressures. Well known CHF prediction methods, such as the look-up table and correlations of earlier workers show poor agreement at high pressures. A new correlation has been proposed to estimate the CHF in uniformly heated vertical tubes up to the critical pressure and over a wide range of parameters. [Reprinted with permission from Elsevier. Copyright, 2005].

Détails

  • Titre original : Studies on critical heat flux in flow boiling at near critical pressures.
  • Identifiant de la fiche : 2006-2273
  • Langues : Anglais
  • Source : International Journal of Heat and Mass Transfer - vol. 49 - n. 1-2
  • Date d'édition : 01/2006

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