On The Phase-Lagged Model Of Superfluidity: High-Temperature Superfluidity Versus Superfluidity At Low Temperatures
Vladamir V. Kulish and Weng-Kong Chan
It has been shown that the finite time lag between the onset of the velocity gradient and the corresponding shear stress that, in the phase-lag model of fluid flow is responsible for the wave transport of momentum, increases as temperature decreases. Thus, the phenomenon of superfluidity – an extremely short-living phenomenon at higher temperatures – may become a long-living phenomenon at lower temperatures. In addition, it follows from the phase-lag model of energy transport that the superfluid behavior should be accompanied by an apparent increase of the thermal conductivity of the fluid. It is suggested that no Bose-Einstein condensation may be needed for superfluidity to occur.