When liquid helium‐4 is cooled to 2.17 K it changes from an ordinary fluid to a superfluid somewhat similar in nature to superfluid helium‐3 and to the electron fluid in superconductors. Extensive investigation over the last five decades has given us a highly refined phenomenological description of how superfluid behaves, even though the underlying quantum theory is only partially understood. Much of the current research on superfluid is part of a continuing effort to work out the implications of this phenomenological description, in the same way as classical fluid dynamicists are still working out the implications of the Navier‐Stokes equations.
Quantized Vortices in Superfluid Helium‐4
William I. Glaberson, Klaus W. Schwarz; Quantized Vortices in Superfluid Helium‐4. Physics Today 1 February 1987; 40 (2): 54–60. https://doi.org/10.1063/1.881099
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