Viscosity of gaseous mixtures of HFC-125+HFC-321

Chiaki Yokoyama, T. Nishino, M. Takahashi

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13 Citations (Scopus)


This paper reports experimental results for the viscosity of gaseous mixtures of HFC-125 (pentafluoroethane) + HFC-32 (difluoromethane). The measurements were carried out with an oscillating-disk viscometer of the Maxwell type at temperatures from 298.15 to 423.15 K. The viscosity was measured for three mixtures (mole fraction of HFC-125 is 0.7498, 0.4998, or 0.2475). The viscosity at normal pressure was analyzed with the extended law of corresponding states developed by Kestin et al. and the scaling parameters were obtained for unlike-pair interactions between HFC-125 and HFC-32. The modified Enskog theory developed by Vesovic and Wakeham was applied to predict the viscosity for the binary gaseous mixtures under pressure. For the calculation of the pseudo-radial distribution function in mixtures, a method based on the Carnahan-Starling equation for the radial distribution function of hard sphere mixtures is proposed.

Original languageEnglish
Pages (from-to)1329-1347
Number of pages19
JournalInternational Journal of Thermophysics
Issue number5
Publication statusPublished - 2001 Jan 1


  • Corresponding states
  • Enskog theory
  • HFC-125
  • HFC-32
  • Mixture model
  • Viscosity

ASJC Scopus subject areas

  • Condensed Matter Physics


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