Temperature-dependent bulk viscosity of nitrogen gas determined from spontaneous Rayleigh-Brillouin scattering
Ziyu Gu, Wim Ubachs
TL;DR
This study measures how the bulk viscosity of nitrogen gas varies with temperature using Rayleigh-Brillouin scattering, revealing a linear increase from 255 K to 340 K and aligning with previous acoustic attenuation data.
Contribution
It provides the first temperature-dependent measurements of nitrogen's bulk viscosity at ultraviolet wavelengths using spontaneous RB scattering.
Findings
Bulk viscosity increases linearly with temperature from 255 K to 340 K.
Results agree with previous MHz-frequency acoustic attenuation measurements.
Values are relevant for hypersound acoustics in the GHz domain.
Abstract
Values for the bulk viscosity of molecular nitrogen gas (N2) were derived from spontaneous Rayleigh-Brillouin (RB) scattering at ultraviolet wavelengths (366.8 nm) and at a 90 degree scattering angle. Analysis of the scattering profiles yield values showing a linear increasing trend in the temperature interval from 255 K to 340 K. The present values, pertaining to hypersound acoustics at frequencies in the GHz domain, are found to be in agreement with results from acoustic attenuation experiments in N2 performed at MHz frequencies.
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