Abstract
Laminar vortex rings were created in a Newtonian fluid and in dilute and semi-dilute polymer solutions, then impinged normally onto a plane, smooth wall. The interaction of the vorticity of these rings with the boundary layer on the wall is studied. The results show the importance of a combined shear and elongation on the elongational behaviour of dilute polymer solutions. They indicate that a combination of shear and elongation can enhance the reflection of vortices at the wall in turbulent, drag-reduced flows.
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