Abstract
The damping of the torsional resonance of aluminum cylinders (5 to 150 kc) surrounded by liquid was measured. In the case of most liquids, it was possible to calculate from these measurements a viscosity value that agrees with the quasi-static value. A frequency-dependent value was found only for ethyl cyclohexane, which in this frequency region shows a strong absorption for normal (longitudinal) sound waves. Quantitatively this can be explained by assuming a complex viscosity that depends on the frequency in the same manner as the complex “pressure viscosity” with which simple relaxation processes can be described.
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