Shear-wave dissipation and the Kapitza conductance
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We have studied the effect of viscosity on the Kapitza conductance, using an atomic model to describe the shear response of the helium at thermal frequencies. We find that when sound from the liquid impinges upon a solid, a much greater fraction of the incident energy goes into shear waves than is transmitted directly to the solid. Only a small percentage of this energy dissipated near the interface need go to the solid for this to be an important mechanism responsible for the Kapitza conductance. The problem of transfer of the dissipated energy is discussed. Reflectivity measurements are suggested as a means of determining the high-frequency shear response of liquid helium. 1973 Plenum Publishing Corporation.
