[Untitled]

We have measured the viscosity, η, and the slip length, ζ, of normal and superfluid3He using a torsional oscillator with a thick sample space. We coated the oscillating surface with 2.5 layers of4He film to study how the4He thin film changes the scattering mechanism of3He quasiparticles at the cell wall at 5 bar and 21 bar. In the normal phase, the temperature dependence of the viscosity was changed a little by the4He film at 21 bar but no change was observed at 5 bar. The slip length was enhanced by4He coating at 5 bar. This enhancement indicates the increase of specularity of3He quasiparticles scattering at the oscillating surface. On the other hand, a reduction of the slip length was observed at 21 bar. In the superfluid phase, the temperature dependence of ζ supports the existence of Andreev reflection even with4He film on the surface at 5 bar and 21 bar.