Viscosity and Density of n-Heptane at High Temperatures and Pressures - Sagdeev, Damir;Fomina, Marina;Abdulagatov, Ilmutdin
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The density and viscosity of n-heptane were simultaneously measured over the temperature range from 298 K to 470 K and at pressures up to 245 MPa using the hydrostatic weighing and falling-body techniques, respectively. The expanded uncertainty of the density, pressure, temperature, and viscosity measurements at the 95 % confidence level with a coverage factor of k = 2 is estimated to be 0.15 % to 0.30 %, 0.05 %, 0.02 K, and 1.5 % to 2.0 % (depending on temperature and pressure ranges), respectively. The measured densities were used to develop a Tait-type equation of state for liquid…mehr

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Produktbeschreibung
The density and viscosity of n-heptane were simultaneously measured over the temperature range from 298 K to 470 K and at pressures up to 245 MPa using the hydrostatic weighing and falling-body techniques, respectively. The expanded uncertainty of the density, pressure, temperature, and viscosity measurements at the 95 % confidence level with a coverage factor of k = 2 is estimated to be 0.15 % to 0.30 %, 0.05 %, 0.02 K, and 1.5 % to 2.0 % (depending on temperature and pressure ranges), respectively. The measured densities were used to develop a Tait-type equation of state for liquid n-heptane. Theoretically based Arrhenius-Andrade and Vogel-Tamman-Fulcher type equations with pressure-dependent coefficients were used to describe the temperature and pressure dependences of the measured viscosities for liquid n-heptane. The measured values of the density and viscosity were compared in detail with reported data and with the values calculated from a reference EOS and correlation models for the viscosity.
Autorenporträt
Damir Sagdeev ¿ Doctor of sciences, Kazan National Research Technological University, Russia. Marina Fomina ¿ Doctor of sciences, Kazan National Research Technological University, Russia. Ilmutdin Abdulagatov ¿ Doctor of sciences, professor, Geothermal Research Institute, Dagestan Scientific Center, Russian Academy of Sciences, Russia.