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

• Autor(a) principal: Sequeira, Maria Carolina
• Data de Publicação: 2022
• Outros Autores: Avelino, Helena Maria Da Nóbrega Teixeira, Caetano, Fernando J. P., Fareleira, João
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10400.21/14155
• topic: n-heptadecane; Viscosity; Density; High pressures

This article reports novel measurements of the viscosity, eta, 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(eta) = 0.015.eta with a confidence level of 0.95. Complementary measurements of the density, rho, 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(rho) = 0.002.rho 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.