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CHF characteristics of R134a flowing upward in a uniformly heated vertical tube.

Author(s) : KIM C. H., CHANG S. H.

Type of article: Article

Summary

An experimental study of the critical heat flux (CHF) using R134a in uniformly heated vertical tube was performed and 182 CHF data points were obtained from the work to investigate the CHF characteristics of R134a. The investigated flow parameters in R134a were: (1) outlet pressures of 13, 16.5, 23.9 bars; (2) mass fluxes of 285-1300 kg/m2.s; and (3) subcooling temperatures of 5-40 °C. The CHF tests were performed in a 17.04 mm I.D. test section with heated length of 3 m. The parametric trends of CHF show a general agreement with previous understanding in the water. To assess the suitability of the CHF test using R134a for modelling the CHF in water, Bowring correlation and Katto correlation were used in the investigation. It was found that the test results coincided well with the data predicted with both correlations. It demonstrates that the R134a can be used as the CHF modelling fluid of water for the investigated flow conditions and geometric condition.

Details

  • Original title: CHF characteristics of R134a flowing upward in a uniformly heated vertical tube.
  • Record ID : 2006-0123
  • Languages: English
  • Source: International Journal of Heat and Mass Transfer - vol. 48 - n. 11
  • Publication date: 2005/05

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