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Turbulent eddy diffusivity for mixing??

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Old   March 22, 2001, 06:07
Default Turbulent eddy diffusivity for mixing??
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In turbulent mixing, an eddy diffusivity is usually used to study the mixing. But when the flow is laminar and unsteady, instabilities present in the system,which can also be used for mixing. In other words, there are also eddies in laminar flow. My question is if there is something like eddy diffusivity that can be used to describe the mixing in laminar usteady flow? if so, how to define it? say, I know the flow velocity field.

Many thanks!

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