Viscosity equations of pure fluids in an innovative extended corresponding states framework: II. Application to four fluids

Abstract This paper represents the second part of a work devoted to an innovative version of the historical extended corresponding states (ECS) technique for the development of viscosity equations on the whole ηTρ surface for individual fluids. In the first part [1] , the theoretical aspects of modelling the ECS transport properties modelling have been discussed, and the fundamental characteristics of the proposed method have been tested, using viscosity values generated from conventional dedicated viscosity equations. The very promising results suggest a move from generated to experimental data correlation to determine dedicated viscosity equations for a number of fluids for which conventional equations are available in literature. This is done in this second part, where the fluids studied are the alkane ethane and the haloalkane refrigerants R123, R134a and R152a. The absolute average deviations (AADs) obtained with primary data are, respectively, 1.04, 1.13, 0.92 and 0.71% with a significant improvement with respect to the conventional equations. Considering that the expected experimental accuracy for good viscosity data is generally in the range 1–2%, the obtained results seem to be very promising.

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