Viscosity of gaseous mixtures of HFC-125 (pentafluoroethane) + HFC-134a (1,1,1,2-tetrafluoroethane) under pressure

Chiaki Yokoyama, Tomomichi Nishino, Mitsuo Takahashi

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


This paper reports experimental results for the viscosity of gaseous mixtures of HFC-125 (pentafluoroethane) + HFC-134a (1,1,1,2-tetrafluoroethane) under pressure. The measurements were carried out with an oscillating-disk viscometer of the Maxwell type at temperatures from 298.15 to 423.15K. The viscosity was measured for three mixtures (mole fraction of HFC-125 is 0.7510, 0.5001 or 0.2508). 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-134a. The modified Enskog theory developed by Vesovic and Wakeham was applied to predict the viscosity for the binary gaseous mixtures under pressure.

Original languageEnglish
Pages (from-to)231-240
Number of pages10
JournalFluid Phase Equilibria
Issue number1-2
Publication statusPublished - 2000 Sep 25


  • Corresponding states
  • Enskog theory
  • HFC-125
  • HFC-134a
  • Mixture model
  • Viscosity

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry


Dive into the research topics of 'Viscosity of gaseous mixtures of HFC-125 (pentafluoroethane) + HFC-134a (1,1,1,2-tetrafluoroethane) under pressure'. Together they form a unique fingerprint.

Cite this