Critical velocity in superfluid helium |
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| Authors: | A. C. Biswas R. K. Pathria |
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| Affiliation: | (1) Department of Physics, University of Waterloo, Waterloo, Ontario, Canada;(2) Present address: Tata Institute of Fundamental Research, Bombay, India |
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| Abstract: | A microscopic approach based on the use of action-angle variables in quantum statistics is employed to study the flow of liquid helium II through a cylindrical channel of diameterd. It is found that for  c/d 1, where c is the coherence length of the system, the superfluid critical velocityvc  d–1/2. For a certain range ofd, this relationship is in closer agreement with experiment than the one based on semiclassical considerations involving quantized vortices. |
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