Bulk viscosity of CO2 from Rayleigh-Brillouin light scattering spectroscopy at 532 nm

Yuanqing Wang, Wim Ubachs, Willem Van De Water

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

Rayleigh-Brillouin scattering spectra of CO 2 were measured at pressures ranging from 0.5 to 4 bars and temperatures from 257 to 355 K using green laser light (wavelength 532 nm, scattering angle of 55.7°). These spectra were compared to two line shape models, which take the bulk viscosity as a parameter. One model applies to the kinetic regime, i.e., low pressures, while the second model uses the continuum, hydrodynamic approach and takes the rotational relaxation time as a parameter, which translates into the bulk viscosity. We do not find a significant dependence of the bulk viscosity with pressure or temperature. At pressures where both models apply, we find a consistent value of the ratio of bulk viscosity over shear viscosity η bs = 0.41 ± 0.10. This value is four orders of magnitude smaller than the common value that is based on the damping of ultrasound and signifies that in light scattering only relaxation of rotational modes matters, while vibrational modes remain "frozen."

Original languageEnglish
Article number154502
Pages (from-to)1-10
Number of pages10
JournalJournal of Chemical Physics
Volume150
Issue number15
Early online date17 Apr 2019
DOIs
Publication statusPublished - 21 Apr 2019

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Brillouin scattering
Light scattering
light scattering
Spectroscopy
Viscosity
viscosity
spectroscopy
Methyl Green
Rayleigh scattering
Shear viscosity
Carbon Monoxide
Relaxation time
scattering
Hydrodynamics
Damping
Ultrasonics
Scattering
line shape
vibration mode
Wavelength

Cite this

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title = "Bulk viscosity of CO2 from Rayleigh-Brillouin light scattering spectroscopy at 532 nm",
abstract = "Rayleigh-Brillouin scattering spectra of CO 2 were measured at pressures ranging from 0.5 to 4 bars and temperatures from 257 to 355 K using green laser light (wavelength 532 nm, scattering angle of 55.7°). These spectra were compared to two line shape models, which take the bulk viscosity as a parameter. One model applies to the kinetic regime, i.e., low pressures, while the second model uses the continuum, hydrodynamic approach and takes the rotational relaxation time as a parameter, which translates into the bulk viscosity. We do not find a significant dependence of the bulk viscosity with pressure or temperature. At pressures where both models apply, we find a consistent value of the ratio of bulk viscosity over shear viscosity η b /η s = 0.41 ± 0.10. This value is four orders of magnitude smaller than the common value that is based on the damping of ultrasound and signifies that in light scattering only relaxation of rotational modes matters, while vibrational modes remain {"}frozen.{"}",
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Bulk viscosity of CO2 from Rayleigh-Brillouin light scattering spectroscopy at 532 nm. / Wang, Yuanqing; Ubachs, Wim; Van De Water, Willem.

In: Journal of Chemical Physics, Vol. 150, No. 15, 154502, 21.04.2019, p. 1-10.

Research output: Contribution to JournalArticleAcademicpeer-review

TY - JOUR

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AU - Ubachs, Wim

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N2 - Rayleigh-Brillouin scattering spectra of CO 2 were measured at pressures ranging from 0.5 to 4 bars and temperatures from 257 to 355 K using green laser light (wavelength 532 nm, scattering angle of 55.7°). These spectra were compared to two line shape models, which take the bulk viscosity as a parameter. One model applies to the kinetic regime, i.e., low pressures, while the second model uses the continuum, hydrodynamic approach and takes the rotational relaxation time as a parameter, which translates into the bulk viscosity. We do not find a significant dependence of the bulk viscosity with pressure or temperature. At pressures where both models apply, we find a consistent value of the ratio of bulk viscosity over shear viscosity η b /η s = 0.41 ± 0.10. This value is four orders of magnitude smaller than the common value that is based on the damping of ultrasound and signifies that in light scattering only relaxation of rotational modes matters, while vibrational modes remain "frozen."

AB - Rayleigh-Brillouin scattering spectra of CO 2 were measured at pressures ranging from 0.5 to 4 bars and temperatures from 257 to 355 K using green laser light (wavelength 532 nm, scattering angle of 55.7°). These spectra were compared to two line shape models, which take the bulk viscosity as a parameter. One model applies to the kinetic regime, i.e., low pressures, while the second model uses the continuum, hydrodynamic approach and takes the rotational relaxation time as a parameter, which translates into the bulk viscosity. We do not find a significant dependence of the bulk viscosity with pressure or temperature. At pressures where both models apply, we find a consistent value of the ratio of bulk viscosity over shear viscosity η b /η s = 0.41 ± 0.10. This value is four orders of magnitude smaller than the common value that is based on the damping of ultrasound and signifies that in light scattering only relaxation of rotational modes matters, while vibrational modes remain "frozen."

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