New flow dissipation mechanisms in superfluid He-3

We have studied the flow of superfluid He-3-B forced through small aperture s. There are unexpectedly large dissipative currents, which can be describe d by two independent processes. One process involves the creation of quasip articles within the aperture and their subsequent acceleration in the ambie nt pressure gradient. The second process involves the dissipative precessio n of a texture in a geometry-induced anisotropic order parameter. For both mechanisms we make a simple estimate of the relevant effect and find these agree well with the data.