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Interfacial mixing by horizontal vortices and shear turbulence

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If you have a question about this talk, please contact Dr C. P. Caulfield .

We consider various aspects of mixing by Taylor vortices at the interface of a two-layer fluid in a Taylor-Couette flow. Experimental results show evidence of an increase in mixing efficiency at large Richardson numbers: for increasing buoyancy gradient the curve of buoyancy flux versus buoyancy gradient tends to be N-shaped. In relation to surface mixed-layer deepening in oceans and lakes, we compare the entrainment rates by shear-generated turbulence and by Taylor vortices that can be considered to represent a model for mixing by continuously driven horizontal vortices such as Langmuir circulation. The results suggest that above a critical Richardson number coherent, horizontal vortices are principally responsible for mixed-layer deepening.

This talk is part of the Institute for Energy and Environmental Flows (IEEF) series.

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