Abstract
A new apparatus which has been designed to determine viscosity, density, and phase behavior in pure fluids or mixtures is presented. The measurements can be conducted from atmospheric conditions up to 70 MPa and 473 K. Using this apparatus, density and viscosity for n-hexane and n-octane have been measured and the results have been compared with the literature values as a function of pressure from about 7 to 70 MPa at temperatures 323, 348, 373, 398, 423, and 448 K. The densities are observed to be measurable with an accuracy better than ±1% and viscosities with an accuracy better than ±5%.
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