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Nucleate pool boiling of R114 and R114-oil mixtures from smooth and enhanced surfaces. 1. Single tubes. 2. Tube bundles.

Author(s) : MEMORY S. B., SUGIYAMA D. C., MARTO P. J., AKCASAYAR N., ERAYDIN H.

Type of article: Article

Summary

For pure refrigerant, the finned tubes typically provide enhancements of between 3 and 4, whilst the re-entrant cavity tubes provide enhancements of more than 10 at low heat fluxes, decreasing to around 4 at high heat fluxes. With addition of oil, performance of the finned tubes at first increases (with 3% oil) before dropping off. For the re-entrant cavity tubes, addition of oil causes a steady drop-off in performance. For pure refrigerant, the structured and porous bundles provide the highest average enhancements of between 4 and 6. For the structured and porous bundles, oil addition leads to a steady decrease in performance, especially for the porous bundle at high heat fluxes.

Details

  • Original title: Nucleate pool boiling of R114 and R114-oil mixtures from smooth and enhanced surfaces. 1. Single tubes. 2. Tube bundles.
  • Record ID : 1996-0768
  • Languages: English
  • Source: International Journal of Heat and Mass Transfer - vol. 38 - n. 8
  • Publication date: 1995/05

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