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.

中文翻译：

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高压下液态正十七烷的粘度和密度测量

本文报道了液体正十七烷在高达 70 MPa 的压力下沿 303 和 358 K 之间的六个等温线的粘度 η 的新测量值。实验是使用在强制模式下操作的振弦式粘度计进行的。303 和 313 K 等温线具有有限的压力范围以避免最终凝固。目前的测量具有小于U (η) = 0.015·η 的不确定性，置信水平为 0.95。使用 DMA HP Anton Paar U 型管密度计，以 DMA 5000 仪器作为读数单元，在相同的温度和压力范围内进行密度 ρ 的补充测量。总体最大不确定性为U(ρ) = 0.002·ρ，置信水平为 0.95。该文章提供了压缩液体正十七烷的粘度与摩尔体积的相关性，该相关性是通过基于改进的硬球理论的方案构建的，该方案描述了大约 10 分钟内的实验数据。1%。支持信息中提供了一个程序，可快速执行粘度随温度和压力变化的插值。由密度计算等温压缩率和等压热膨胀率。粘度-压力系数也由粘度确定。