Viscosity of carbon dioxide and ethane

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Abstract
The viscosity of carbon dioxide was measured at temperatures between 298.15 and 323.15 K at pressures up to 145 bar, and the viscosity of ethane at temperatures between 298.15 and 348.15 K at pressures up to 130 bar, both experimental ranges of which include critical regions of sample gases, respectively. The measurements were carried out by the oscillating disk viscometer, combining with a local determination of the density at the position of the oscillating disk. The viscosities of both substances exhibit an anomalous increase near the critical point. The anomalous increase of viscosity was examined for the following relation along the critical isochore, that is, Δη/?=A ln[(T‐Tc)/Tc]+B, where Δη:anomalous viscosity, ?:background viscosity, T:temperature in K, and Tc:critical temperature in K. This relation was satisfied for the temperature range of (T‐Tc)/Tc<0.0033 for both substances.

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