Taylor Couette flow in a two-layer stratified fluid: instabilities and mixing

Details Taylor Couette flow in a two-layer stratified fluid: instabilities and mixing Taylor Couette flow in a two-layer stratified fluid: instabilities and mixing

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005dyato..40...57e&link_type=abstract

Dynamics of Atmospheres and Oceans, Volume 40, Issue 1-2, p. 57-69.

Computer Science

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Scientific paper

In this preliminary experimental study we investigate the mixing of a salt-stratified two-layer fluid in a Taylor Couette flow. We focus on two flow regimes, one in which waves are present in the pycnocline and vortices in the homogeneous layers, and one with vortices also in the pycnocline. The transition between these two regimes differs significantly compared to the wave vortex transition found in a uniform stratification, investigated by Caton et al. [Caton, F., Janiaud, B., Hopfinger, E.J., 2000. Stability and bifurcations in stratified Taylor Couette flow. J. Fluid Mech. 419, 93 124], and is accompanied by a larger jump in fundamental frequency of the density fluc- tuations. Most density gradients show a strong tendency to sharpen with time, with layer formation in the case of an initially thick interface. On a long time-scale, the entrainment of a smooth pycnocline shows cascade-like bifurcations before its transition to chaos. In the latter case, a decrease of the initial density gradient is observed. We discuss the mixing efficiency, measured by the Richardson flux number Ri. Its value is a function of the Reynolds number ˜Re, with k=3/2, and for Reynolds numbers O(10), the mixing efficiency is of order O(10).

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