A Helmholtz Energy Equation of State for Sulfur Dioxide

Gao, Kehui; Wu, Jiangtao; Zhang, Penggang; Lemmon, Eric W.

doi:10.1021/acs.jced.6b00195

Cited by 32 publications

(25 citation statements)

References 43 publications

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“…The equation of state of Gao et al (K. Gao, Wu, Zhang, & Lemmon, 2016) was used to provide the density and the critical parameters. Lennard-Jones parameters were obtained from Hirschfelder, Curtiss, and Bird (Hirschfelder et al, 1964).…”

Section: Sulfur Dioxidementioning

confidence: 99%

Models for viscosity, thermal conductivity, and surface tension of selected pure fluids as implemented in REFPROP v10.0

Huber¹

2018

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We describe models for the viscosity, thermal conductivity, and surface tension for selected fluids implemented in version 10.0 of the NIST computer program, NIST Standard Reference Database 23, also known as NIST Reference Fluid Thermodynamic and Transport Properties Database (REFPROP). These fluids do not presently have published reference fluid quality models in the open literature, so we provide preliminary models based on available data as an interim measure to allow calculations of these properties. Comparisons with available experimental data are given.

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Section: Sulfur Dioxidementioning

confidence: 99%

Models for viscosity, thermal conductivity, and surface tension of selected pure fluids as implemented in REFPROP v10.0

Huber¹

2018

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“…In order to ensure the correct behavior of the correlation and its derivatives at the critical point, the first temperature exponent must be between zero and one, with a positive coefficient n 1 . 29,30 The calculated values from Eq. (2) deviate from the results obtained from our EOS by less than 0.03% at temperatures up to 641 K. In the vicinity of the critical point, deviations increase to a maximum of 0.06%.…”

Section: Saturated-liquid Density Equationmentioning

confidence: 99%

“…Thus, most modern reference EOS were developed with the same basic mathematical structure as presented in this section. Excellent examples are the equations for R-125 of Lemmon and Jacobsen, 45 for propane of Lemmon et al, 29 for R-1234ze(E) of Thol and Lemmon, 46 and for sulfur dioxide of Gao et al 30 In general, EOS in terms of the Helmholtz energy a can be formulated as aðT; rÞ 5 a o ðT; rÞ 1 a r ðT; rÞ:…”

Section: Equation Of Statementioning

confidence: 99%

A Reference Equation of State for Heavy Water

Herrig

Thol

Harvey

et al. 2018

Journal of Physical and Chemical Reference Data

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An empirical fundamental equation of state (EOS) is presented for fluid heavy water (deuterium oxide, D 2 O). The equation is explicit in the reduced Helmholtz energy and allows the calculation of all thermodynamic properties over the whole fluid surface. It is valid from the melting-pressure curve up to a temperature of 825 K at pressures up to 1200 MPa. Overall, the formulation represents the most accurate measured values and almost all other available data within their experimental uncertainty. In the homogeneous liquid and vapor phase, the expanded relative uncertainties of densities calculated from the EOS are mostly 0.1% or less; liquid-phase densities at atmospheric pressure can be calculated with an uncertainty of 0.01%. The speed of sound in the liquid phase is described with a maximum uncertainty of 0.1%; the most accurate experimental sound speeds are represented within their uncertainties ranging from 0.015% to 0.02%. In a large part of the liquid region, the isobaric heat capacity is represented with an uncertainty of 1%. The uncertainty in vapor pressure is mostly within 0.05%. In the critical region, the uncertainties of calculated properties are in most cases higher than the values above, but the EOS enables a reasonable description of this region. The equation matches available data for the metastable subcooled liquid, and it extrapolates in a qualitatively correct way to extreme values of temperature and pressure. This formulation is the result of an effort to establish a new standard for the thermodynamic properties of heavy water by the International Association for the Properties of Water and Steam.

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“…The development of the correlation requires densities; Gao et al . 14 very recently developed an accurate, wide-ranging equation of state that is valid from the triple point up to 725 K and 1000 MPa. In the vapor phase, the uncertainties in density are 0.1% at temperatures between 410 K and 580 K with pressures below 100 MPa, and 0.05% at temperatures between 220 K and 400 K with pressures below 10 MPa.…”

Section: The Correlationmentioning

confidence: 99%

“…Very recently, Gao et al . 14 developed a new equation of state for ammonia (including a slightly different critical point than the values used by Tillner-Roth et al. 13 ) The present work employs this new equation of state, and a) a new set of measurements of viscosity published by Laesecke et al .…”

Section: Introductionmentioning

confidence: 99%

Reference Correlation for the Viscosity of Ammonia from the Triple Point to 725 K and up to 50 MPa

Monogenidou

Assael

Huber

2018

Journal of Physical and Chemical Reference Data

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This paper presents a new wide-ranging correlation for the viscosity of ammonia based on critically evaluated experimental data. The correlation is designed to be used with a recently developed equation of state, and it is valid from the triple point to 725 K, at pressures up to 50 MPa. The estimated uncertainty varies depending on the temperature and pressure, from 0.6% to 5%. The correlation behaves in a physically reasonable manner when extrapolated to 100 MPa, however care should be taken when using the correlations outside of the validated range.

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A Helmholtz Energy Equation of State for Sulfur Dioxide

Cited by 32 publications

References 43 publications

Models for viscosity, thermal conductivity, and surface tension of selected pure fluids as implemented in REFPROP v10.0

Models for viscosity, thermal conductivity, and surface tension of selected pure fluids as implemented in REFPROP v10.0

A Reference Equation of State for Heavy Water

Reference Correlation for the Viscosity of Ammonia from the Triple Point to 725 K and up to 50 MPa

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