Flow-boiling heat transfer of R-134a-based nanofluids in a horizontal tube

Kristen Henderson, Young Gil Park, Liping Liu, Anthony M. Jacobi

Research output: Contribution to journalArticlepeer-review


The influence of nanoparticles on the flow-boiling of R-134a and R-134a/polyolester mixtures is quantified for flows of low vapor quality (x < 20%) over a range of mass fluxes (100 < G < 400 kg/m2 s). With direct dispersion of SiO2 nanoparticles in R-134a, the heat transfer coefficient decreases (as much as 55%) in comparison to pure R-134a. This degradation is, in part, due to difficulties in obtaining a stable dispersion. However, excellent dispersion is achieved for a mixture of R-134a and polyolester oil with CuO nanoparticles, and the heat transfer coefficient increases more than 100% over baseline R-134a/polyolester results. In the range of these experiments, nanoparticles have an insignificant effect on the flow pressure drop with the R-134a/POE/CuO nanofluid.

Original languageEnglish (US)
Pages (from-to)944-951
Number of pages8
JournalInternational Journal of Heat and Mass Transfer
Issue number5-6
StatePublished - Feb 2010


  • Dispersion
  • Flow-boiling
  • Halocarbon
  • Nanofluid
  • Nanotechnology

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes


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