This thesis reports numerical calculations on quantized vortices in 4 He and 3 He superfluids.
Vortices are of crucial importance in understanding many of the superfluid properties.
All the calculations presented in the thesis have experimental relevance, either in understanding measured results or in predicting the outcome of planned experiments. He has been observed to exhibit incomplete wetting on certain solid substrates. The variations in the thickness of the fluid layer are explained by a model with a nonuniform distribution of pinned vortices. Within this theory, the equilibrium properties of the superfluid are controlled by the distribution, i.e. the texture, of the order parameter describing the superfluid state. In the anisotropic A phase of 3 He, vorticity usually appears in doubly-quantized continuous vortices, having no singular core.