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Transfert de chaleur lors de la condensation dans les tubes à microailettes à chevrons.

Condensation heat transfer of herringbone micro fin tubes.

Auteurs : MIYARA A., OTSUBO Y.

Résumé

Experiments of in-tube condensation of R410A were carried out for a smooth tube, a helical micro fin tube and three types of herringbone micro fin tubes, which have different fin height and helix angle. In the herringbone micro fin tube, the micro fins work to remove liquid at fin-diverging parts and collect liquid at fin-converging parts. In the high mass velocity region the heat transfer coefficients of all the herringbone tubes are higher than those of the helical micro fin tube. In the low mass velocity region, however, the heat transfer coefficients of the herringbone micro fin tubes are slightly lower than those of the helical micro fin tube. The heat transfer coefficient is lower for smaller helix angle tube and effect of fin height on the heat transfer is small. Pressure drop of the herringbone tube of which helix angle is small is lower than that of the helical micro fin tube, while that of other tubes is higher. Flow configurations of the herringbone tubes were observed with R123 as working fluid and the heat transfer enhancement mechanism is discussed.

Détails

  • Titre original : Condensation heat transfer of herringbone micro fin tubes.
  • Identifiant de la fiche : 2004-2729
  • Langues : Anglais
  • Date d'édition : 07/2002
  • Source : Source : Int. J. therm. Sci./Proc. ExHFT-5, Thessaloniki
    vol. 41; n. 7; 639-645; fig.; tabl.; 8 ref.

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