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Saturation of decaying counterflow turbulence in helium II

This work, resulting from international collaboration between theoretical groups at Newcastle and Palermo and the experimental group in Prague, resolves a decade-old contradiction between experiments on the decay of superfluid thermal counterflow turbulence. The physical origins of two different decay regimes, of the transition between them, and of saturation of decaying turbulent counterflow are explained for the first time. Quantitative predictions of the saturation time are made which enabled us to give a clear interpretation to decaying counterflow experiments.