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Steady-state turbulent motion is created in superfluid 3He-B at lowtemperatures in the form of a turbulent vortex front, which moves axially alonga rotating cylindrical container of 3He-B and replaces vortex-free flow withvortex lines at constant density. We present the first measurements on thethermal signal from dissipation as a function of time, recorded at 0.2 Tcduring the front motion, which is monitored using NMR techniques. Both themeasurements and the numerical calculations of the vortex dynamics show that atlow temperatures the density of the propagating vortices falls well below theequilibrium value, i.e. the superfluid rotates at a smaller angular velocitythan the container. This is the first evidence for the decoupling of thesuperfluid from the container reference frame in the zero-temperature limit.

Superfluid vortex front at T -> 0: Decoupling from the reference frame