Abstract
The flow properties of liquid helium are such that the motions of vortex rings and line vortices can be calculated from hydrodynamic potential theory. The two‐dimensional (line vortex) case allows a relatively simple method of calculating vortex motion: The ’’Routh path function’’ yields a solution through conformal mapping. Using this method, the case of a rectilinear vortex pair approaching a slit in a wall is analyzed. Criteria for their just passing through are found.
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