Superfluid mass current induced by chaotic vortex lines in turbulent He II

摘要

Using the Gaussian model of a chaotic vortex tangle in counterflowing superfluid turbulent He II, we calculate superfluid mass current induced by vortex filaments. This additional superfluid current directed against the external superfluid flow is shown to appear due to the nonzero average polarization of the vortex loops. In macroscopic descriptions, in particular in hydrodynamic experiments, the induced superfluid current displays itself as a suppression of the superfluid density. The temperature dependent relative change of the superfluid density - Delta rho(s)/rho(s) turns out to be several percent. Some experimental consequences such as an additional pressure drop and a decrease of the velocity of the second sound propagating in the superfluid turbulent He II are discussed. [References: 19]