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Convective vaporization of refrigerants in tube banks.

Author(s) : GUPTE N. S., WEBB R. L.

Summary

Existing schemes for correlating heat transfer coefficients for convective vaporization in tubes and tube banks are reviewed briefly. The asymptotic model is selected as the most suitable for correlating both in-tube and tube bank data. The model contains a nucleate boiling and a forced convection term, and the vaporization coefficient is asymptotic to pool boiling at low Reynolds numbers and to convective vaporization at high Reynolds numbers. The model is used to correlate the authors' R11 and R123 data for a tube bank with enhanced tube geometry. The data were taken in an apparatus that allows independent control of vapour quality, mass velocity, and heat flux. The two-phase convection multiplier is correlated with the two-phase friction multiplier and the liquid Prandtl number. The data show no suppression of the nucleate boiling coefficient because of convection. The exponent in the asymtotic model is chosen to provide the best data fit. The model correlates heat transfer coefficients within more or less 20%.

Details

  • Original title: Convective vaporization of refrigerants in tube banks.
  • Record ID : 1993-2552
  • Languages: English
  • Source: ASHRAE Transactions 1992. Part 2.
  • Publication date: 1992
  • Document available for consultation in the library of the IIR headquarters only.

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