VORTEX HEATING IN SUPERFLUID-HELIUM AT LOW-TEMPERATURES

We address the fundamental problem of dissipation of kinetic energy in superfluid turbulence at temperatures low enough that friction agains t the normal fluid is negligible. We find that the kinetic energy of a turbulent vortex tangle, transformed into compressional energy, can r esult in a significant heating of the fluid. We suggest that vortex he aring can be used to investigate turbulence at these low temperatures, where the traditional second-sound technique fails. [S0031-9007(98)07 636-4].