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Wilhelm, J. O.; Vogel, E.

doi:10.1023/a:1006667125801

Cited by 61 publications

(33 citation statements)

References 8 publications

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“…The effect of the changed calibration is demonstrated for these measurements in Fig. 2, but also for those by Wilhelm and Vogel in 2000 [35] applying a vibrating-wire viscometer. The deviations of the original experimental data are indicated by filled symbols, they are (0.25 to 0.4) % higher than the theoretical values.…”

Section: Measurements and Resultsmentioning

confidence: 56%

“…The analogous open symbols represent the [14] at low and medium temperatures. Experimental data: • present paper, 1st series of measurements; present paper, 2nd series of measurements; present paper, 3rd series of measurements; Vogel [24], 1st series of measurements, re-evaluated with the new argon standard; Vogel [24], 1st series of measurements, uncorrected datum at room temperature; Vogel [24], 2nd series of measurements, re-evaluated with the new argon standard; Vogel [24], 2nd series of measurements, uncorrected datum at room temperature; Vogel [15], re-evaluated with the new argon standard; Vogel [15], uncorrected datum at room temperature; Wilhelm and Vogel [35], re-evaluated with the new argon standard; Wilhelm and Vogel [35], uncorrected datum at room temperature Table 3 Viscosity of argon at low density corrected with new theoretical argon standard-measurements in 1972 [24] and 1984 [15] with oscillating-disk viscometers at Rostock University deviations of the experimental data in the corresponding complete temperature range after changing the reference values used for the calibration. Note that the measurements with oscillating-disk viscometers at Rostock University reported in 1972, 1984, and 2010 represent virtually independent studies.…”

Section: Measurements and Resultsmentioning

confidence: 99%

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Reference Viscosity of Argon at Low Density in the Temperature Range from 290 K to 680 K

Vogel

2010

Int J Thermophys

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An all-quartz oscillating-disk viscometer of very high precision was used to measure the temperature dependence of the viscosity of argon in the limit of zero density. The measurements were based on a single calibration value at 298.15 K, which was calculated theoretically using an accurate ab initio pair potential for argon and the kinetic theory of dilute gases. The uncertainty of the experimental data is conservatively estimated to be 0.15 % at room temperature increasing to 0.2 % at the highest temperature of 680 K. The new data, as well as viscosities determined in 2007 at the National Institute of Standards and Technology in the range from 200 K to 400 K, agree excellently within ±0.1 % with the theoretically calculated viscosity of argon at zero density. On the contrary, the widely accepted viscosity data recommended by Kestin et al. (J Chem Phys 56:4119, 1972) deviate by as much as 0.9 %.

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Section: Measurements and Resultsmentioning

confidence: 56%

Section: Measurements and Resultsmentioning

confidence: 99%

Reference Viscosity of Argon at Low Density in the Temperature Range from 290 K to 680 K

Vogel

2010

Int J Thermophys

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“…The viscosity of argon gas was selected from experimentally obtained data at a constant temperature. 16 This suggests that the viscous effect imposed by the wall is noticeable as a net reduction in the effective mean free path of the gas at the bulk. Figure 5 compares the variation of MFP along the characteristic length for a range of rarefaction levels for reflective and explicit wall models.…”

Section: Viscosity Mfpmentioning

confidence: 99%

The effect of system boundaries on the mean free path for confined gases

et al. 2013

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The mean free path of rarefied gases is accurately determined using Molecular Dynamics simulations. The simulations are carried out on isothermal argon gas (Lennard-Jones fluid) over a range of rarefaction levels under various confinements (unbounded gas, parallel reflective wall and explicit solid platinum wall bounded gas) in a nanoscale domain. The system is also analyzed independently in constitutive sub-systems to calculate the corresponding local mean free paths. Our studies which predominate in the transition regime substantiate the boundary limiting effect on mean free paths owing to the sharp diminution in molecular free paths near the planar boundaries. These studies provide insight to the transport phenomena of rarefied gases through nanochannels which have established their potential in microscale and nanoscale heat transfer applications.

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“…͑14͒ were determined by fitting experimental data for C reported by Hurly et al 65 and by Wilhelm and Vogel 141 using published values of the LennardJones scaling parameters for argon, krypton, and nitrogen, 10 methane, 137 sulfur hexafluoride, 120 and propane. 136 We determined the Lennard-Jones parameters for carbon tetrafluoride and hexafluoroethane by fitting the zero-density viscosity data of Hurly et al 63 The behavior of the correlation is illustrated in Fig.…”

Section: ͑13͒mentioning

confidence: 99%

A New Reference Correlation for the Viscosity of Methanol

Xiang¹,

Laesecke²,

Huber³

2006

Journal of Physical and Chemical Reference Data

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A new reference-quality correlation for the viscosity of methanol is presented that is valid over the entire fluid region, including vapor, liquid, and metastable phases. To describe the zero-density viscosity with kinetic theory for polar gases, a new expression for the collision integral of the Stockmayer potential is introduced. The initial density dependence is based on the Rainwater-Friend theory. A new correlation for the third viscosity virial coefficient is developed from experimental data and applied to methanol. The high-density contribution to the viscosity is based on the Chapman-Enskog theory and includes a new expression for the hard-sphere diameter that is a function of both temperature and density. The resulting correlation is applicable for temperatures from the triple point to 630 K at pressures up to 8 GPa. The estimated uncertainty of the resulting correlation ͑with a coverage factor of 2͒ varies from 0.6% in the dilute-gas phase between room temperature and 630 K, to less than 2% for the liquid phase at pressures up to 30 MPa at temperatures between 273 and 343 K, 3% for pressures from 30 to 100 MPa, 5% for the liquid from 100 to 500 MPa, and 10% between 500 MPa and 4 GPa. At very high pressures, from 4 to 8 GPa, the correlation has an estimated uncertainty of 30% and can be used to indicate qualitative behavior. © 2006 by the U.S. Secretary of Commerce on behalf of the United States. All rights reserved.

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Cited by 61 publications

References 8 publications

Reference Viscosity of Argon at Low Density in the Temperature Range from 290 K to 680 K

Reference Viscosity of Argon at Low Density in the Temperature Range from 290 K to 680 K

The effect of system boundaries on the mean free path for confined gases

A New Reference Correlation for the Viscosity of Methanol

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