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Heat transfer and pressure drop for flow of supercritical and subcritical CO2 in microchannel tubes.

Author(s) : PETTERSEN J., VESTBØSTAD K.

Summary

The test tube had 25 circular ports/channels with 0.79 mm inner diameter. The CO2-side heat transfer coefficient was attained by using a modified Wilson plot technique. Measured data were compared to correlations available in the literature. Gnielinski's correlation for the single-phase (supercritical pressure) heat transfer coefficient and Colebrook & White's correlation for the single-phase pressure drop showed a satisfactory correspondence. For evaporating heat transfer and pressure drop, common correlations did not give good correspondence to test data. Under some conditions, the evaporating heat transfer coefficient dropped significantly as the vapour fraction increased. This dry-out effect was most pronounced for high heat and mass flux, and high evaporation temperature.

Details

  • Original title: Heat transfer and pressure drop for flow of supercritical and subcritical CO2 in microchannel tubes.
  • Record ID : 2002-1752
  • Languages: English
  • Source: Selected issues on CO2 as working fluid in compression systems. Workshop proceedings.
  • Publication date: 2000/09/18
  • Document available for consultation in the library of the IIR headquarters only.

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