Models for bulk viscosity in carbon dioxide

Research output

Abstract

Bulk viscosity in carbon dioxide is studied using the accurate kinetic theory method. Complex structure of the CO2 molecule and various channels for vibrational relaxation are taken into account while calculating the vibrational relaxation time. It is shown that in the general case, the bulk viscosity coefficient cannot be represented as a sum of independent contributions of rotational and vibrational degrees of freedom. The predicted ratio of bulk and shear viscosity coefficients does not exceed 5 for temperatures lower that 2000â...K. Thus we put in question the widely used assumption about the high ratio of bulk and shear viscosity coefficients in CO2 at low temperature.

Original languageEnglish
Title of host publication31st International Symposium on Rarefied Gas Dynamics, RGD 2018
PublisherAmerican Institute of Physics
Number of pages8
ISBN (Print)9780735418745
DOIs
Publication statusE-pub ahead of print - 5 Aug 2019
Event31st International Symposium on Rarefied Gas Dynamics, RGD 2018 - Glasgow
Duration: 23 Jul 201827 Jul 2018

Publication series

NameAIP Conference Proceedings
PublisherAmerican Institute of Physics
Number1
Volume2132
ISSN (Print)0094-243X

Conference

Conference31st International Symposium on Rarefied Gas Dynamics, RGD 2018
CountryUnited Kingdom
CityGlasgow
Period23/07/1827/07/18

Fingerprint

carbon dioxide
viscosity
molecular relaxation
coefficients
shear
kinetic theory
degrees of freedom
relaxation time
kinetics
molecules

Scopus subject areas

  • Physics and Astronomy(all)
  • Ecology

Cite this

Kustova, E., & Mekhonoshina, M. (2019). Models for bulk viscosity in carbon dioxide. In 31st International Symposium on Rarefied Gas Dynamics, RGD 2018 [150006] (AIP Conference Proceedings; Vol. 2132, No. 1). American Institute of Physics. https://doi.org/10.1063/1.5119646
Kustova, Elena ; Mekhonoshina, Mariia. / Models for bulk viscosity in carbon dioxide. 31st International Symposium on Rarefied Gas Dynamics, RGD 2018. American Institute of Physics, 2019. (AIP Conference Proceedings; 1).
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Kustova, E & Mekhonoshina, M 2019, Models for bulk viscosity in carbon dioxide. in 31st International Symposium on Rarefied Gas Dynamics, RGD 2018., 150006, AIP Conference Proceedings, no. 1, vol. 2132, American Institute of Physics, Glasgow, 23/07/18. https://doi.org/10.1063/1.5119646

Models for bulk viscosity in carbon dioxide. / Kustova, Elena; Mekhonoshina, Mariia.

31st International Symposium on Rarefied Gas Dynamics, RGD 2018. American Institute of Physics, 2019. 150006 (AIP Conference Proceedings; Vol. 2132, No. 1).

Research output

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PY - 2019/8/5

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N2 - Bulk viscosity in carbon dioxide is studied using the accurate kinetic theory method. Complex structure of the CO2 molecule and various channels for vibrational relaxation are taken into account while calculating the vibrational relaxation time. It is shown that in the general case, the bulk viscosity coefficient cannot be represented as a sum of independent contributions of rotational and vibrational degrees of freedom. The predicted ratio of bulk and shear viscosity coefficients does not exceed 5 for temperatures lower that 2000â...K. Thus we put in question the widely used assumption about the high ratio of bulk and shear viscosity coefficients in CO2 at low temperature.

AB - Bulk viscosity in carbon dioxide is studied using the accurate kinetic theory method. Complex structure of the CO2 molecule and various channels for vibrational relaxation are taken into account while calculating the vibrational relaxation time. It is shown that in the general case, the bulk viscosity coefficient cannot be represented as a sum of independent contributions of rotational and vibrational degrees of freedom. The predicted ratio of bulk and shear viscosity coefficients does not exceed 5 for temperatures lower that 2000â...K. Thus we put in question the widely used assumption about the high ratio of bulk and shear viscosity coefficients in CO2 at low temperature.

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Kustova E, Mekhonoshina M. Models for bulk viscosity in carbon dioxide. In 31st International Symposium on Rarefied Gas Dynamics, RGD 2018. American Institute of Physics. 2019. 150006. (AIP Conference Proceedings; 1). https://doi.org/10.1063/1.5119646