Determination of the equation of state and heat capacity of argon at high pressures from speed‐of‐sound data

1991 ◽  
Vol 94 (3) ◽  
pp. 2130-2135 ◽  
Author(s):  
C. A. ten Seldam ◽  
S. N. Biswas
Keyword(s):  
Heat Capacity ◽  
Equation Of State ◽  
Speed Of Sound ◽  
High Pressures ◽  
Sound Data

Equation of State andP−V−T−xProperties of Refrigerant Mixtures Based on Speed of Sound Data

2003 ◽  
Vol 42 (16) ◽  
pp. 3802-3808 ◽  
Author(s):  
Mohammad Mehdi Papari ◽  
Ahmad Razavizadeh ◽  
Fathollah Mokhberi ◽  
Ali Boushehri
Keyword(s):  
Equation Of State ◽  
Speed Of Sound ◽  
Refrigerant Mixtures ◽  
Sound Data

Method for the Experimental Determination of the Bunsen Absorption Coefficient of Hydraulic Fluids

2019 ◽  
Author(s):  
Andris Rambaks ◽  
Katharina Schmitz
Keyword(s):  
Equation Of State ◽  
Absorption Coefficient ◽  
Error Estimate ◽  
High Pressures ◽  
Volumetric Method ◽  
Virial Equation ◽  
Amount Of Substance ◽  
Virial Equation Of State ◽  
Hydraulic Fluids

Abstract A manometric-volumetric method to determine the Bunsen absorption coefficient of hydraulic fluids at high-pressures is presented. The virial equation of state is used to determine the amount of substance and its composition in the gaseous phase and at high-pressures. An error-analysis is presented for a best-case error estimate of the method.

scholarly journals Thermoelastic properties of magnesiowüstite, (Mg1−xFex)O: determination of the Anderson–Grüneisen parameter by time-of-flight neutron powder diffraction at simultaneous high pressures and temperatures

2008 ◽  
Vol 41 (5) ◽  
pp. 886-896 ◽  
Author(s):  
Ian G. Wood ◽  
Lidunka Vočadlo ◽  
David P. Dobson ◽  
G. David Price ◽  
A. D. Fortes ◽  
...  
Keyword(s):  
Equation Of State ◽  
Powder Diffraction ◽  
High Pressures ◽  
Equations Of State ◽  
Time Of Flight ◽  
Neutron Powder Diffraction ◽  
Grüneisen Parameter ◽  
Gruneisen Parameter ◽  
Measured State

The ability to perform neutron diffraction studies at simultaneous high pressures and high temperatures is a relatively recent development. The suitability of this technique for determiningP–V–Tequations of state has been investigated by measuring the lattice parameters of Mg1−xFexO (x= 0.2, 0.3, 0.4), in the rangeP < 10.3 GPa and 300 <T< 986 K, by time-of-flight neutron powder diffraction. Pressures were determined using metallic Fe as a marker and temperatures were measured by neutron absorption resonance radiography. Within the resolution of the experiment, no evidence was found for any change in the temperature derivative of the isothermal incompressibility, ∂KT/∂T, with composition. By assuming that the equation-of-state parameters either varied linearly or were invariant with composition, the 60 measured state points were fitted simultaneously to aP–V–T–xequation of state, leading to values of ∂KT/∂T= −0.024 (9) GPa K−1and of the isothermal Anderson–Grüneisen parameter δT= 4.0 (16) at 300 K. Two designs of simultaneous high-P/Tcell were employed during this study. It appears that, by virtue of its extended pressure range, a design using toroidal gaskets is more suitable for equation-of-state studies than is the system described by Le Godec, Dove, Francis, Kohn, Marshall, Pawley, Price, Redfern, Rhodes, Ross, Schofield, Schooneveld, Syfosse, Tucker & Welch [Mineral. Mag.(2001),65, 737–748].

scholarly journals High - temperature and high-pressure (p, ρ, T) measurements and derived thermodynamic properties of 1-octyl-3-methylimidazolium hexafluorophosphate

2020 ◽  
Vol 85 (2) ◽  
pp. 237-250
Author(s):  
Javid Safarov ◽  
Christoffer Bussemer ◽  
Abilgani Aliyev ◽  
Gorica Ivanis ◽  
Mirjana Kijevcanin ◽  
...  
Keyword(s):  
Heat Capacity ◽  
High Pressure ◽  
High Temperature ◽  
Equation Of State ◽  
Thermodynamic Properties ◽  
High Pressures ◽  
Type Equation ◽  
Isentropic Compressibility ◽  
Primary Data ◽  
Capacity Data

Densities of ionic liquid (IL) 1-octyl-3-methylimidazolium hexafluorophosphate [OMIM][PF6] at high temperatures and high pressures were measured. The measurements were made along 10 isotherms over a temperature range T = 278.15 to 413.15 K, at pressures up to 140 MPa by means of an Anton Paar DMA HPM vibration tube densimeter (VTD). The combined expanded relative uncertainties of the density, pressure and temperature measurements at the 95 % confidence level with a coverage factor of k = 2 are estimated to be 0.03 to 0.08 % (depending on temperature and pressure ranges), 0.1 %, and 0.015 K, respectively. We have critically assessed all of the reported high-pressure densities for [OMIM][PF6], together with the presented results, in order to carefully select primary data for development of a reference wide-ranging equation of state. Values of ??T isobars curvatures, (?2?/?T2)?, were estimated using the present high-pressure ?-T measurements and they were pretty low (0.78?10-7 to 1.50??10-7 m3 kg-1 K-1), indicating that the heat capacity of [OMIM][PF6] very weakly depends on pressure, since (?Cp/?P)T ?(?2?/?T2)?. Density data were fitted to the modified Tammann?Tait equation and the multiparametric polynomial-type equation of state (EOS) for the IL was developed using the measured high-pressure and high-temperature (p, ?, T) data. This EOS, together with our previous measured heat capacity data at atmospheric pressure, was used to calculate high-pressure and high-temperature derived thermodynamic properties, such as isothermal compressibility,isentropic compressibility, isobaric thermal expansion coefficient, heat capacities,etc.

Equation of state for liquid water

2006 ◽  
Vol 4 ◽  
pp. 186-199
Author(s):  
R.I. Nigmatulin ◽  
R.Kh. Bolotnova
Keyword(s):  
Experimental Data ◽  
Heat Capacity ◽  
Equation Of State ◽  
Liquid Water ◽  
Specific Volume ◽  
High Pressures ◽  
Internal Heat ◽  
Heat Energy ◽  
Grüneisen Coefficient ◽  
Gruneisen Coefficient

The equation of state for water (EOSW) in Mi–Gruneisen form with Born–Mayer potential for densities less, than 1 g/cm^3 is developed. The equation is applicable to moderate and high pressures (up to 2·10^12 Pa), in particular, to explosive and static pressures in the range of densities from 0.7 to 3.8 g/cm^3 . The equation for the Gruneisen coefficient that depends not only on the specific volume but also on the temperature is received. The proposed method by the experimental data for dependencies on specific volume and temperature the heat capacity and isochoric temperature coefficient of pressure increase allows to calculate the Gruneisen coefficient and the internal heat energy.

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