@article{heckerman1980pressure,
author = {Heckerman, David and Rosenbaum, Ralph and Putterman, Seth and Williams, Gary A.},
title = {Pressure release superleak sound modes in He II},
year = {1980},
month = {March},
abstract = {The sound modes of He II in a waveguide partially packed with superleak are investigated for the case of a free surface within the waveguide. In the limit of zero vapor density, two propagating modes are found: one a gravity wave whose velocity depends on the superfluid fraction, and the other a temperature wave which is analogous to adiabatic U-tube osculations. With finite vapor the U-tube mode in pure 4He mixes strongly with the vapor sound; however, in 3He-4He mixtures it is uncoupled from the vapor and is observable. Experimental results are in qualitative agreement with the theory.},
publisher = {Springer},
url = {http://approjects.co.za/?big=en-us/research/publication/pressure-release-superleak-sound-modes-ii/},
pages = {629-640},
journal = {Journal of Low Temperature Physics},
volume = {38},
number = {5-6},
}