Viscosity and density measurements on liquid n-heptadecane at high pressures

Sequeira, Maria Carolina; Avelino, Helena Maria da Nóbrega Teixeira; Caetano, Fernando J. P.; Fareleira, João M. N. A.

http://hdl.handle.net/10400.2/11643

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Authors

Sequeira, Maria Carolina

Avelino, Helena Maria da Nóbrega Teixeira

Caetano, Fernando J. P.

Fareleira, João M. N. A.

Abstract(s)

This article reports novel measurements of the viscosity, η, of liquid n-heptadecane at pressures up to 70 MPa, along six isotherms between 303 and 358 K. The experiments were carried out using a vibrating wire viscometer operated in the forced mode. The 303 and 313 K isotherms have a restricted range of pressures to avoid eventual solidification. The present measurements have an uncertainty less than U(η) = 0.015·η with a confidence level of 0.95. Complementary measurements of the density, ρ, were performed with the same ranges of temperature and pressure, using a DMA HP Anton Paar U-tube densimeter, with a DMA 5000 instrument as a reading unit. The overall maximum uncertainty is U(ρ) = 0.002·ρ with a confidence level of 0.95. The article provides a correlation of the viscosity of compressed liquid n-heptadecane with the molar volume, constructed by means of a scheme based on a modified hard-sphere theory, which describes the experimental data within ca. 1%. A program is provided in the Supporting Information to promptly perform interpolation of the viscosity as a function of temperature and pressure. The isothermal compressibility and the isobaric thermal expansivity were calculated from the density. Viscosity–pressure coefficients have also been determined from the viscosity.