Abstract
Different reports of the shear viscosities of shocked water, relying on measurements of ionic drift speeds in aqueous solution, of propagation of corrugations impressed on the shock front and of the acceleration of entrained cylinders, disagree by six orders of magnitude (ranging from \(10^{-3}\) to \(10^{3}\) Pa-s) across overlapping ranges of shock pressure (up to 25 GPa). Measurements made at static pressures and high temperatures have proved that viscosities vary little along the Hugoniot, verifying the shock-wave results based on ionic drift speeds. Why the other two procedures yielded such different results has been a matter of speculation. Here, I show reason to believe that the trajectories of the entrained cylinders were in a region of drag in which viscosities of \(10^{-3}\) and \(10^{0}\) Pa-s were experimentally indistinguishable, resulting in much larger supposed viscosities than warranted by the data. It follows that the observations concerning impressed corrugations are best interpreted as resulting from dissipative processes that are distinct from the shear viscosity of the equilibrated fluid.
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This work was supported by the Department of Energy, Contract no. DE-NA0001843.
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Communicated by S. H. R. Hosseini.
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Abramson, E.H. Speculation on measurements of the viscosity of shocked fluid water. Shock Waves 25, 103–106 (2015). https://doi.org/10.1007/s00193-014-0534-3
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DOI: https://doi.org/10.1007/s00193-014-0534-3