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Analyse expérimentale pour la détermination du coefficient de transfert de chaleur par convection grâce à la mesure directe de la chute de pression pendant l'écoulement annulaire de condensation du R134a dans un tube lisse vertical.

Experimental analysis for the determination of the convective heat transfer coefficient by measuring pressure drop directly during annular condensation flow of R134a in a vertical smooth tube.

Auteurs : DALKILIC A. S., TEKE I., WONGWISES S.

Type d'article : Article

Résumé

This study investigated the direct relationship between the measured condensation pressure drop and convective heat transfer coefficient of R134a flowing downward inside a vertical smooth copper tube having an inner diameter of 8.1 mm and a length of 500 mm during annular flow. R134a and water were used as working fluids on the tube side and annular side of a double tube heat exchanger, respectively. Condensation experiments were performed at mass fluxes of 260, 300, 340, 400, 456 and 515 kg m-2 s-1 in the high mass flux region of R134a. The condensing temperatures were around 40 and 50°C; the heat fluxes were between 10.16 and 66.61 kW m-2. Paliwoda’s analysis, which focused mainly on the determination of the two-phase flow factor and two-phase length of evaporators and condensers, was adapted to the in-tube condensation phenomena in the test section to determine the condensation heat transfer coefficient, heat flux, two-phase length and pressure drop experimentally by means of a large number of data points obtained under various experimental conditions.

Détails

  • Titre original : Experimental analysis for the determination of the convective heat transfer coefficient by measuring pressure drop directly during annular condensation flow of R134a in a vertical smooth tube.
  • Identifiant de la fiche : 30001169
  • Langues : Anglais
  • Source : International Journal of Heat and Mass Transfer - vol. 54 - n. 4
  • Date d'édition : 01/2011
  • DOI : http://dx.doi.org/10.1016/j.ijheatmasstransfer.2010.06.057

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