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Local condensation heat transfer rates in fine passages.

Author(s) : BAIRD J. R., FLETCHER D. F., HAYNES B. S.

Type of article: Article

Summary

Local heat transfer coefficients for flow condensation of HCFC-123 and of R11 were measured for a wide range of mass fluxes, heat fluxes, vapour qualities (superheated to fully condensed), and pressures in tubes with internal diameters of 0.92 and 1.95 mm. The data show a strong influence of mass flux and local quality on the heat transfer coefficient, with a weaker influence of system pressure. The data also show a clear enhancing effect of the condensation rate (heat flux) on the heat transfer coefficient. There is very little influence of tube diameter over the range investigated. A simple model of gas-liquid shear-driven annular flows, with a turbulent liquid film and allowance for the influence of condensation rates on the gas-liquid interfacial shear force, accounts quantitatively for the major effects observed.

Details

  • Original title: Local condensation heat transfer rates in fine passages.
  • Record ID : 2004-1562
  • Languages: English
  • Source: International Journal of Heat and Mass Transfer - vol. 46 - n. 23
  • Publication date: 2003/11

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