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We compute the Andreev reflection coefficient of a flux of thermalquasiparticles in He3-B incident upon various two-dimensional vortexconfigurations. We find that, for the same number of positive and negativevortex points, the reflection coefficient is much reduced if the points arearranged in pairs (which corresponds to a gas of vortex rings inthree-dimensions) rather than random (which corresponds to a vortex tangle inthree-dimensions). This results is consistent with measurements performed byBradley et al. at the University of Lancaster.

Thermal flux of quasiparticles and the transition between two regimes of turbulence in He3-B