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Coefficients du transfert de chaleur lors de l'ébullition de frigorigènes halogénés jusqu'aux flux de chaleur critique.

Nucleate boiling heat transfer coefficients of halogenated refrigerants up to critical heat fluxes.

Auteurs : KANG D. G., PARK K. J., JUNG D.

Résumé

Nucleate pool boiling heat transfer coefficients of five refrigerants of differing vapour pressures are measured on a horizontal smooth copper surface of 9.53 by 9.53 mm. Tested refrigerants are R123, R152a, R134a, R22, and R32, and HTCs are taken from 10 kW/m2 to critical heat flux of each refrigerant. Wall and fluid temperatures are measured directly by thermocouples located underneath the test surface and in the liquid pool, respectively. Test results show that nucleate pool boiling HTCs of halogenated refrigerants increase as the heat flux and vapour pressure increase. This typical trend is maintained even at high heat fluxes above 200 kW/m2. Zuber's prediction equation for critical heat flux is quite accurate showing a maximum deviation of 21% for all refrigerants tested. For all refrigerants, Stephan and Abdelsalam's well known correlation underpredicted nucleate boiling HTC data up to the critical heat flux with an average deviation of 21.3% while Cooper's correlation overpredicted the data with an average deviation of 14.2%. On the other hand, Gorenflo's and Jung et al.'s correlations showed 5.8 and 6.4% deviations, respectively, in the entire nucleate boiling range up to the critical heat flux.

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Format PDF

Pages : 2009-5

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    20 €

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    Gratuit

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Détails

  • Titre original : Nucleate boiling heat transfer coefficients of halogenated refrigerants up to critical heat fluxes.
  • Identifiant de la fiche : 2009-1937
  • Langues : Anglais
  • Source : 3rd Conference on Thermophysical Properties and Transfer Processes of Refrigerants
  • Date d'édition : 23/06/2009

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