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Evers, C.; Lösch, H. W.; Wagner, Wolfgang

doi:10.1023/a:1020784330515

Cited by 114 publications

(77 citation statements)

References 27 publications

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“…Here, we refer to Fig. 3 by Kestin and Leidenfrost [20]; the rotating cylinder measurements by Evers et al [21]; and Berg's quartz capillary measurements [22]. They also considered the value calculated ab initio in 2000 using the helium-helium potential φ 00 [23] and the value published in 2007 calculated with the potential φ 07 [17].…”

Section: Thermoacoustic Boundary Layermentioning

confidence: 99%

Optimizing acoustic measurements of the Boltzmann constant

Moldover

2009

Comptes Rendus. Physique

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We review the progress in acoustic metrology of gases that has occurred since the 1988 measurement of the universal gas constant R using a spherical acoustic resonator. The advances in understanding resonators and in calculating the thermophysical properties of helium ab initio suggest that today one could determine Boltzmann's constant k B from acoustic measurements using either helium or argon with a relative uncertainty less than 10 −6 . RésuméProgrès dans la détermination de la constante de Boltzmann par voie acoustique L'article récapitule les avancées effectuées en métrologie acoustique dans les gaz depuis la mesure de la constante universelle des gaz R effectuée en 1988 en utilisant un résonateur acoustique sphérique. Des progrès substantiels ont été réalisés, tant pour mieux comprendre le fonctionnement des résonateurs acoustiques que pour calculer ab initio, avec une fiabilité accrue, les caractéristiques thermo-physiques de l'hélium. Ils permettent d'envisager désormais une détermination de la constante de Boltzmann k B par voie acoustique avec une incertitude relative meilleure que 10 -6 , en utilisant soit l'argon, soit l'hélium.________________________________ 1. Introduction.

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Section: Thermoacoustic Boundary Layermentioning

confidence: 99%

Optimizing acoustic measurements of the Boltzmann constant

Moldover

2009

Comptes Rendus. Physique

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“…Error bars for one or two (in the case that the uncertainty changes with temperature) values of each data set are additionally plotted. The figure demonstrates that excellent agreement within AE0.1% exists only for the absolute measurement by Evers et al [30] at 348 K and that the results of the absolute measurements by Flynn et al [28] are adequately consistent within AE0.3%. The other data were determined by relative measurements, which are not only affected by the usual measurement errors, but also by the values used for the calibration.…”

Section: Viscositymentioning

confidence: 62%

“…Recently, Evers et al [30] utilized a Figure 5. Relative deviations of experimental and calculated viscosity coefficients from values cal(pres) calculated quantum-mechanically with the new interatomic potential for Ne near to room temperature.…”

Section: Viscositymentioning

confidence: 99%

“…Experimental data with uncertainties characterized by error bars: . Kestin and Leidenfrost [24]; Kestin and Nagashima [25]; n DiPippo et al [26]; 5 Kestin et al [27], best estimate; g Flynn et al [28]; i Vogel [29], fitted value; m Vogel [29], experimental data corrected according to new helium standard;^Evers et al [30]. Calculated values: Á Á Á Á Á Á Á Á Á fifth-order classical calculation [] cl,5 ; ----potential by Aziz and Slaman [7]; -Á -Á -Á potential by Cybulski and Toczylowski [6].…”

Section: Viscositymentioning

confidence: 99%

“…Coremans et al [33]; . Coremans et al [33], corrected according to new helium standard; i Rietveld et al [34]; g Flynn et al [28]; s Clarke and Smith [35];^Evers et al [30]. Calculated values: Á Á Á Á Á Á Á Á Á fifth-order classical calculation [] cl,5 ; ----potential by Aziz and Slaman [7]; -Á -Á -Á potential by Cybulski and Toczylowski [6]; ----potential by Wu¨est and Merkt [5].…”

Section: Viscositymentioning

confidence: 99%

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Erratum

2008

Molecular Physics

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A neon-neon interatomic potential energy curve determined from quantum-mechanical ab initio calculations and described with an analytical representation (R. Hellmann, E. Bich, and E. Vogel, Molec. Phys. 106, 133 (2008)) was used in the framework of the quantum-statistical mechanics and of the corresponding kinetic theory to calculate the most important thermophysical properties of neon governed by two-body and three-body interactions. The second and third pressure virial coefficients as well as the viscosity and thermal conductivity coefficients, the last two in the so-called limit of zero density, were calculated for natural Ne from 25 to 10,000 K. Comparison of the calculated viscosity and thermal conductivity with the most accurate experimental data at ambient temperature shows that these values are accurate enough to be applied as standard values for the complete temperature range of the calculations characterized by an uncertainty of about AE0.1% except at the lowest temperatures.

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A method for determining transverse permeability of tight reservoir cores by radial pressure pulse decay measurement

et al. 2016

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A transverse pressure pulse decay (TPPD) method is presented to measure transverse permeability of tight reservoir cores in a cell with finite volume. Given appropriate assumptions, a mathematical model based on the specially designed experiment is formulated, and its general solution is proposed. Early‐time and late‐time techniques are further presented for convenient postprocessing applications of experimental data. Meanwhile, sensitivity analysis of TPPD method is given. It is found that a good TPPD experimental principle can be obtained by adjusting test gas, experimental pressure, dimension of core sample, and volume ratio (λ). The volume ratio error (λerror) analysis reveals the following: (1) a larger λerror results in increased transverse permeability error (kerror); (2) the volume ratio (λ) is better not very close to 0.754; (3) when λ is equal to or greater than 1, the kerror resulting from λerror is monotonic decreasing as the volume ratio increases. In practice, λ is usually equal to or greater than 1 due to the very small pore volume of a tight core. But this does not mean that the volume ratio should be as large as possible. The reason for this is that a pressure transducer with higher resolution is needed to record pressure change. That means experimental apparatus is much more costly. And such a TPPD experiment requires a much longer time to attain the late‐time straight line behavior. The best choice is to find an optimal balance point among experimental cost, time, and accuracy.

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Untitled

Cited by 114 publications

References 27 publications

Optimizing acoustic measurements of the Boltzmann constant

Optimizing acoustic measurements of the Boltzmann constant

Erratum

A method for determining transverse permeability of tight reservoir cores by radial pressure pulse decay measurement

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