Experimental study and correlation of the thermal conductivity of 1,1,1,2-tetrafluoroethane (R134a) in the rarefied gas state
Abstract The thermal conductivity for the gas phase of 1,1,1,2-tetrafluoroethane (R134a) was measured by means of the coaxial cylinder method in steady state and by the transient coaxial cylinder apparatus. The operation of the instruments was verified by measuring the thermal conductivity of Ar, toluene, and R22. The numerical thermal conductivity data are analysed and represented analytically using the Mason-Monchick approximation and in conjunction with other transport property data. The estimates of the thermal conductivity of 1,1,1,2-tetrafluoroethane in the dilute gas state are given.