Viscosity of binary gaseous mixtures at moderate pressures - N2+He, N2+CClF3 (R13) and N2+CHClF2 (R22) systems.

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  • N<sub>2</sub>+He, N<sub>2</sub>+CClF<sub>3</sub> (R13) AND N<sub>2</sub>+CHClF<sub>2</sub> (R22) SYSTEMS

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The viscosities of three binary gaseous mixtures N2 + He, N2+CClF3 (R13) and N2+CHCIF2 (R22), have been measured at 25°, 50° and 75°C over a range of pressures from the atmospheric to about 8 bar. The measurements were performed by a rolling-ball viscometer in the laminar flow region on a relative basis. The calibration curves were prepared using N2 and H2 at the experimental conditions. The uncertainty in the viscosity should be smaller than 0.5 percent.<br> The viscosity of the nonpolar gas system, N2+He, increases with pressure throughout the experimental temperatures in the same manner as nonpolar pure gases. However, the mixtures containing one polar gas, N2+CClF3 and N2+CHC1F2, behave anomalously at the lowest temperature, 25°C, where the viscosity decreases slightly with increasing pressure.<br> The experimental viscosity values were used to evaluate three expressions presented by Bird-Hirschfelder-Curtiss, Wilke and Brokaw for the estimation of the viscosity of gas mixtures.

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