C.N. Archie

Viscosity measurements in superfluid 3He-B from 2 to 29 bar

Measurements from a high-Q torsional oscillator and a vibrating wire are presented which give a consistent view of the viscosity of the normal fraction of 3He-B at high pressure. At low pressures discrepancies are largely eliminated by taking into account a mean-free-path size effect. We compare our corrected viscosities with recent calculations. The superfluid fraction, also measured in this experiment, is reexamined in the light of recent specific heat measurements.