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Flow boiling heat transfer of R134a and R245fa in a 2.3 mm tube.

Author(s) : TIBIRIÇÁ C. B., RIBATSKI G.

Type of article: Article

Summary

This paper presents new experimental flow boiling heat transfer results in micro-scale tubes. The experimental data were obtained in a horizontal 2.3 mm I.D. stainless steel tube with heating length of 464 mm, R134a and R245fa as working fluids, mass velocities ranging from 50 to 700 kg/m2.s, heat flux from 5 to 55 kW/m2, exit saturation temperatures of 22, 31 and 41°C, and vapour qualities ranging from 0.05 to 0.99. Flow pattern characterization was also performed from images obtained by high-speed filming. Heat transfer coefficient results from 1 to 14 kW/m2.K were measured. It was found that the heat transfer coefficient is a strong function of heat flux, mass velocity and vapour quality. The experimental data were compared against ten flow boiling predictive methods from the literature. Liu and Winterton, Zhang et al. and Saitoh et al. worked best for both fluids, capturing most of the experimental heat transfer trends. [Reprinted with permission from Elsevier. Copyright, 2010].

Details

  • Original title: Flow boiling heat transfer of R134a and R245fa in a 2.3 mm tube.
  • Record ID : 2010-1411
  • Languages: English
  • Source: International Journal of Heat and Mass Transfer - vol. 53 - n. 11-12
  • Publication date: 2010/05
  • DOI: http://dx.doi.org/10.1016/j.ijheatmasstransfer.2010.01.038

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