Journal
PHYSICAL REVIEW LETTERS
Volume 102, Issue 13, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.102.134504
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- U.S. Department of Energy [DE-AC52-06NA25396]
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Shear-induced vertical mixing in a stratified flow is a key ingredient of thermohaline circulation. We experimentally determine the vertical flux of momentum and density of a forced gravity current using high-resolution velocity and density measurements. A constant eddy-viscosity model provides a poor description of the physics of mixing, but a Prandtl mixing length model relating momentum and density fluxes to mean velocity and density gradients works well. For the average gradient Richardson number Ri(g)approximate to 0.08 and a Taylor Reynolds number Re(lambda)approximate to 100, the mixing lengths are fairly constant, about the same magnitude, comparable to the turbulent shear length.
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