Thermodynamic Properties of Propane. IV. Speed of Sound in the Liquid and Supercritical Regions

Meier, Karsten; Kabelac, Stephan

doi:10.1021/je300466a

Cited by 17 publications

(25 citation statements)

References 18 publications

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“…The RMS deviation of the calibration equation from the measurements was 0.010 %. Combining, in quadrature, the deviation of the EOS from the data of Meier and Kabelac [40] with the deviation of the path-length calibration equation from the present measurements yields an estimated combined standard uncertainty of 0.016 % in our speed of sound measurements. This represents a conservative estimate of the uncertainty since it is likely that a portion of the difference between the path-length calibration and the present data is due to systematic deviations between the EOS and the data of Meier and Kabelac.…”

Section: Calibration Of Path-length Difference and Measurement Uncertmentioning

confidence: 66%

“…This represents a conservative estimate of the uncertainty since it is likely that a portion of the difference between the path-length calibration and the present data is due to systematic deviations between the EOS and the data of Meier and Kabelac. [40] When reporting the uncertainties in experimental data it is customary to combine the effects of the state-point uncertainty (i.e., the effects of the uncertainties in temperature, pressure, and composition) with those in the uncertainty of the primary measurand (i.e., the speed of sound):…”

Section: Calibration Of Path-length Difference and Measurement Uncertmentioning

confidence: 99%

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Thermophysical properties of polyol ester lubricants

Bruno¹,

Fortin²,

Huber³

et al. 2019

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This report summarizes the results of work performed for the Naval Air Warfare Center Aircraft Division by the National Institute of Standards and Technology (NIST), Applied Chemicals and Materials Division on the properties of polyol ester lubricants under interagency agreement number N0042115IP00008. The work includes purity analysis and assessment, decomposition studies, experimental measurements on density, isobaric heat capacity, speed of sound, vapor pressure, viscosity, thermal conductivity, and distillation curve measurements. Models were developed for the thermodynamic properties, viscosity, and thermal conductivity that represent these properties to nearly within their experimental uncertainty for three pure polyol ester base fluids (pentaerythritol tetrapentanoate (POE5), pentaerythritol tetraheptanoate (POE7), pentaerythritol tetranonanoate (POE9), and a fully qualified lubricant meeting military specification MIL-PRF-23699.

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Section: Calibration Of Path-length Difference and Measurement Uncertmentioning

confidence: 66%

Section: Calibration Of Path-length Difference and Measurement Uncertmentioning

confidence: 99%

Thermophysical properties of polyol ester lubricants

Bruno¹,

Fortin²,

Huber³

et al. 2019

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“…Dzida and co-workers have studied u(T,P) for n-alkanes, alcohols and their mixtures, and have discussed their results from a physical chemistry point of view. The research groups of Lago et al, [91][92][93][94][95][96][97][98][99][100] Kabelac et al, [101][102][103][104] Guedes et al, [106][107][108][109] Trusler et al [110][111][112] and others 105,113,114 have reported measurements of u(T,P) on compounds such as: water, hydrocarbons, refrigerants, oils over a wide range of temperature and pressure. Research on the u(T,P) for biomassderived fuels and related compounds has recently been reported.…”

Section: Speed Of Sound In Liquid Organic Compoundsmentioning

confidence: 99%

CHAPTER 13. Ultrasonics 2: High Pressure Speed of Sound, Isentropic Compressibility

Takagi¹

2014

Volume Properties

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The pressure-volume (density)-temperature (P-r-T) surface of a fluid presents the basic thermodynamic properties for investigating the behaviour of fluids. The isothermal compressibility, k T , and isentropic (adiabatic) compressibility, k S , of a fluid are defined as:(13:1)where r refers to the specific molar volume, P to pressure, T to temperature and S to entropy. The pioneering studies on the P-r-T relationships for various compounds were conducted by Bridgman, 1,2 Gibson and Kincaid 3,4 and many colleagues in the early 20th century. Today, the experimental P-r-T data of a large number of liquids and/or mixtures have been stored or published in a variety of styles. Examples include the databases of Volume Properties: Liquids, Solutions and Vapours Edited by Emmerich Wilhelm and Trevor M. Letcher

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“…In recent studies, we have measured comprehensive data sets of the speed of sound in liquid and supercritical ethane, propane, and normal butane by a double-path-length pulse-echo technique over a wide range of temperature and at high pressures of up to 100 MPa. With this work, we continue these studies for isobutane.…”

Section: Introductionmentioning

confidence: 99%

Speed-of-Sound Measurements and Derived Thermodynamic Properties of Liquid Isobutane

Hawary

Meier

2018

J. Chem. Eng. Data

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This article reports comprehensive and accurate measurements of the speed of sound in liquid isobutane. The measurements were carried out by a double-path-length pulse-echo technique and cover the temperature range between 200 and 420 K with pressures of up to 100 MPa. The expanded measurement uncertainties (at the 0.95 confidence level) are 2.1 mK for temperature, 0.007% for pressure, and 0.009% for the speed of sound with the exception of a few state points at low pressures and in the vicinity of the critical point, where it increases up to 0.035%. Furthermore, densities and specific isobaric and isochoric heat capacities were derived from the speed-of-sound data in the temperature range between 200 and 340 K and up to 100 MPa by the method of thermodynamic integration. Very accurate results for the derived properties were obtained by determining values of the isobaric heat capacity on the initial isobar for the integration by a well-known thermodynamic relation among the isobaric heat capacity, density, and speed of sound from very accurate density data at low pressures of (Glos, S.; Kleinrahm, R.; Wagner, W. J. Chem. Thermodyn. 2004, 36, 1037−1059) and our speed-of-sound data. Moreover, these initial values were manually adjusted to enforce physically correct behavior of the calculated derivatives of the equation of state. Comparisons of the experimental speeds of sound and derived properties with the Helmholtz energy formulation of Bucker and Wagner for isobutane (Bucker, D.; Wagner, W. J. Phys. Chem. Ref. Data 2006Data , 35, 929−1019 and data from the literature demonstrate the high accuracy of the results and reveal potential to improve the formulation.

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Thermodynamic Properties of Propane. IV. Speed of Sound in the Liquid and Supercritical Regions

Cited by 17 publications

References 18 publications

Thermophysical properties of polyol ester lubricants

Thermophysical properties of polyol ester lubricants

CHAPTER 13. Ultrasonics 2: High Pressure Speed of Sound, Isentropic Compressibility

Speed-of-Sound Measurements and Derived Thermodynamic Properties of Liquid Isobutane

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