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Heat transfer enhancement by metal foam during nucleate pool boiling of refrigerant/oil mixture at a wide range of oil concentration.

Author(s) : ZHU Y., HU H., DING G., et al.

Type of article: Article

Summary

Nucleate pool boiling heat transfer characteristics of refrigerant/oil mixtures on metal foam covers were experimentally investigated at a wide range of oil concentrations. The refrigerant and oil are R113 and VG68, respectively; and the oil concentration varies from 0 to 40%. The copper foams have pores per inch (ppi) of 10 and 20 and porosity from 90 to 98%. Experimental conditions include a saturation pressure of 101 kPa (14.696 psi), and heat flux from 30 to 137 kW/m2 (2.6417 to 12.064 Btu/s.ft2). The experimental results indicate that the nucleate pool boiling heat transfer coefficients on copper foam covers are larger than those on a plain heating surface by a maximum of 450%; the presence of oil deteriorates the nucleate pool boiling heat transfer on copper foam covers by a maximum of 90%. With the increase of oil concentration, the deterioration effect on high ppi metal foams is more obvious than that for low ppi. A correlation for predicting the nucleate pool boiling heat transfer coefficient of refrigerant/oil mixtures on metal foam covers is developed, and it agrees with 90% of the experimental data within a deviation of ±30%.

Details

  • Original title: Heat transfer enhancement by metal foam during nucleate pool boiling of refrigerant/oil mixture at a wide range of oil concentration.
  • Record ID : 30004848
  • Languages: English
  • Source: HVAC&R Research - vol. 18 - n. 3
  • Publication date: 2012/06
  • DOI: http://dx.doi.org/10.1080/10789669.2012.623565

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