Physics – Fluid Dynamics
Scientific paper
2010-02-16
J. Phys.: Conf. Ser. 269 012011 (2011)
Physics
Fluid Dynamics
7 pages, 4 figures. Proceedings of the Anglo-French Physical Acoustics Conference, January 2010
Scientific paper
10.1088/1742-6596/269/1/012011
Despite its fundamental role in the dynamics of compressible fluids, bulk viscosity has received little experimental attention and there remains a paucity of measured data. Acoustic spectroscopy provides a robust and accurate approach to measuring this parameter. Working from the Navier-Stokes model of a compressible fluid one can show that the bulk viscosity makes a significant and measurable contribution to the frequency-squared acoustic attenuation. Here we employ this methodology to determine the bulk viscosity of Millipore water over a temperature range of 7 to 50 degrees Celsius. The measured attenuation spectra are consistent with the theoretical predictions, while the bulk viscosity of water is found to be approximately three times larger than its shear counterpart, reinforcing its significance in acoustic propagation. Moreover, our results demonstrate that this technique can be readily and generally applied to fluids to accurately determine their temperature dependent bulk viscosities.
Holmes Jeremy M.
Parker N. G.
Povey M. J. W.
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