Summary
The motion of a liquid containing a substantial volume fraction of gas bubbles can often be calculated by considering a suitably averaged single phase continuum. This averaged material will be compressible as well as viscous and the problem arises to the determination (by experiment) of its shear and bulk viscosity coefficients. The direct measurement of bulk viscosity would be difficult, and the usual approach has been to measure an apparent elongational viscosity and then appeal to an analogy between elasticity and viscosity, claiming a connection similar to that which holds between the various elastic moduli. It is shown that this analogy does not hold in compression and that the experiments must be reinterpreted more carefully.
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Wilson, S.D.R. The measurement of bulk viscosity and the elastic-viscous analogy. Acta Mechanica 120, 217–225 (1997). https://doi.org/10.1007/BF01174325
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DOI: https://doi.org/10.1007/BF01174325