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Film-wise condensation of a pure fluid and a binary mixture in a bundle of enhanced surface tubes.

Author(s) : BELGHAZI M., BONTEMPS A., MARVILLET C.

Summary

An experimental study was carried out to investigate the characteristics of condensation in a bundle of horizontal tubes. These tubes have different types of external surfaces: smooth surface (1D), low trapezoidal fins with several fin pitches (2D) and specific fins (3D, C+ tube). The used fluids are either pure refrigerant (HFC-134a) or binary mixture of refrigerants (HFC-134a/HFC-23). For the pure fluid and a single tube, the influence of fin spacing was studied (11, 19, 26, 32 and 40 fins/inch) and a comparison was made with the Gewa C+ tube. The results were analysed with the Beatty and Katz theory and compared with a specific model, taking into account both gravity and surface tension effects, developed for the Gewa C+ tube. For the bundle and for a pure fluid, the inundation of the lowest tubes has a strong effect on the Gewa C+ tubes performances contrary to the finned tubes. For the mixture the heat transfer coefficient decreases dramatically especially for Gewa C+ tube.

Details

  • Original title: Film-wise condensation of a pure fluid and a binary mixture in a bundle of enhanced surface tubes.
  • Record ID : 2004-2723
  • Languages: English
  • Publication date: 2002/07
  • Source: Source: Int. J. therm. Sci./Proc. ExHFT-5, Thessaloniki
    vol. 41; n. 7; 631-638; fig.; 14 ref.

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