Vibrational relaxation in H2O vapor in the temperature range 373–946 K

Bass, Henry E.; Olson, John R.; Amme, Robert C.

doi:10.1121/1.1903464

Cited by 19 publications

(8 citation statements)

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“…Four sets of measurements in water vapor of rotational collision numbers or relaxation times or rates are available: one at 323.15 K by Roesler and Sahm, 102 with a quoted uncertainty of Ϯ25%, one by Bass et al 103 covering the temperature range from 373 to 946 K with uncertainties falling from Ϯ70% at 373 K to Ϯ30% at 946 K, a measurement at 500 K with an uncertainty of Ϯ33% by Keaton and Bass, 104 and measurements between 300 and 500 K with uncertainties of about Ϯ20% by Synofzik et al 105 All four papers mentioned the difficulty of these measurements. The results have been converted to volume-viscosity values using Eq.…”

Section: Volume Viscositymentioning

confidence: 99%

Calculation of the transport and relaxation properties of dilute water vapor

Hellmann

Bich

Vogel

et al. 2009

The Journal of Chemical Physics

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Transport properties of dilute water vapor have been calculated in the rigid-rotor approximation using four different potential energy hypersurfaces and the classical-trajectory method. Results are reported for shear viscosity, self-diffusion, thermal conductivity, and volume viscosity in the dilute-gas limit for the temperature range of 250-2500 K. Of these four surfaces the CC-pol surface of Bukowski et al. [J. Chem. Phys. 128, 094314 (2008)] is in best accord with the available measurements. Very good agreement is found with the most accurate results for viscosity in the whole temperature range of the experiments. For thermal conductivity the deviations of the calculated values from the experimental data increase systematically with increasing temperature to around 5% at 1100 K. For both self-diffusion and volume viscosity, the much more limited number of available measurements are generally consistent with the calculated values, apart from the lower temperature isotopically labeled diffusion measurements.

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Section: Volume Viscositymentioning

confidence: 99%

Calculation of the transport and relaxation properties of dilute water vapor

Hellmann

Bich

Vogel

et al. 2009

The Journal of Chemical Physics

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“…Since the SSH theory is based on vibration-translation and vibrationvibration relaxation and our focus is on processes at room temperature, we do not consider vibration-rotation and rotation-translation relaxation, which typically are important at high temperatures. [19][20][21][22] In addition, a minor oversight in the DL model is corrected and the DL model is refined by using full pairwise parametrization of two-molecule collisions. The gases chosen for the study are nitrogen, methane, and water vapor because they were studied in the original DL model and because they have practical implications for an acoustic gas sensor.…”

Section: Introductionmentioning

confidence: 99%

Fine-tuning molecular acoustic models: sensitivity of the predicted attenuation to the Lennard–Jones parameters

Petculescu

Lueptow

2005

The Journal of the Acoustical Society of America

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In a previous paper [Y. Dain and R. M. Lueptow, J. Acoust. Soc. Am. 109, 1955 (2001)], a model of acoustic attenuation due to vibration-translation and vibration-vibration relaxation in multiple polyatomic gas mixtures was developed. In this paper, the model is improved by treating binary molecular collisions via fully pairwise vibrational transition probabilities. The sensitivity of the model to small variations in the Lennard-Jones parameters--collision diameter (sigma) and potential depth (epsilon)--is investigated for nitrogen-water-methane mixtures. For a N2(98.97%)-H2O(338 ppm)-CH4(1%) test mixture, the transition probabilities and acoustic absorption curves are much more sensitive to sigma than they are to epsilon. Additionally, when the 1% methane is replaced by nitrogen, the resulting mixture [N2(99.97%)-H2O(338 ppm)] becomes considerably more sensitive to changes of sigma(water). The current model minimizes the underprediction of the acoustic absorption peak magnitudes reported by S. G. Ejakov et al. [J. Acoust. Soc. Am. 113, 1871 (2003)].

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“…Data for the relaxation times of water vapor are surprisingly scant, are frequently scattered, and are sensitive to the effects of impurities. A discussion of many of the best known studies of sound absorption and relaxation times in water vapor has been provided by Bass, Olsen, and Amme 47 and Keeton and Bass. 48 The estimates for μ b /μ presented here were computed using the data for Z v ≡ τ v /τ c and Z r ≡ τ r /τ c provided by Bass, Olsen, and Amme.…”

Section: Fluids Having Moderate Bulk Viscositymentioning

confidence: 99%

“…48 The estimates for μ b /μ presented here were computed using the data for Z v ≡ τ v /τ c and Z r ≡ τ r /τ c provided by Bass, Olsen, and Amme. 47 We assumed that Bass, Olsen, and Amme computed their Z r and Z v using the hard sphere collision time given by…”

Section: Fluids Having Moderate Bulk Viscositymentioning

confidence: 99%

Numerical estimates for the bulk viscosity of ideal gases

Cramer

2012

Physics of Fluids

168

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We estimate the bulk viscosity of a selection of well known ideal gases. A relatively simple formula is combined with published values of rotational and vibrational relaxation times. It is shown that the bulk viscosity can take on a wide variety of numerical values and variations with temperature. Several fluids, including common diatomic gases, are seen to have bulk viscosities which are hundreds or thousands of times larger than their shear viscosities. We have also provided new estimates for the bulk viscosity of water vapor in the range 380–1000 K. We conjecture that the variation of bulk viscosity with temperature will have a local maximum for most fluids. The Lambert-Salter correlation is used to argue that the vibrational contribution to the bulk viscosities of a sequence of fluids having a similar number of hydrogen atoms at a fixed temperature will increase with the characteristic temperature of the lowest vibrational mode.

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Vibrational relaxation in H2O vapor in the temperature range 373–946 K

Cited by 19 publications

References 0 publications

Calculation of the transport and relaxation properties of dilute water vapor

Calculation of the transport and relaxation properties of dilute water vapor

Fine-tuning molecular acoustic models: sensitivity of the predicted attenuation to the Lennard–Jones parameters

Numerical estimates for the bulk viscosity of ideal gases

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