PRESSURE RELEASE SOUND MODES IN He IIReport as inadecuate




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Abstract : The acoustic modes of He II in a waveguide partially filled with superleak are investigated for the case of a pressure release boundary condition at the upper surface of the waveguide. Experimentally this is obtained by using the free surface of the He II to form the top of the waveguide. Two propagating modes are found ; one is a temperature wave analogous to adiabatic U-tube oscillations, and the other is a gravity wave modified by the presence of the superleak.





Author: G. Williams S. Putterman

Source: https://hal.archives-ouvertes.fr/



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