Turbulent diffusion: Difference between revisions

Revision as of 15:22, 20 February 2012

turbulent diffusion

(Or eddy diffusion.) Diffusion or dispersion due to the effects of turbulent motions.

When quantifying turbulent diffusion, it is important to distinguish between two types of measurement: 1) single-particle diffusion, where we measure the distances between diffusing particles at a fixed point or a point moving with the mean fluid velocity, and where the mean-square particle displacement initially increases rapidly with time (e.g., linearly); and 2) two-particle diffusion, where we measure the distances between particle pairs or the dimensions of a cloud of diffusing particles. Here the mean-square distance initially increases more slowly (e.g., as the 5/ 2 power of the time).

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-<div class="definition"><div class="short_definition">(<br/>''Or'' eddy diffusion.) [[Diffusion]] or [[dispersion]] due to the effects of turbulent  motions.</div><br/> <div class="paragraph">When quantifying turbulent diffusion, it is important to distinguish between two types of  measurement: 1) single-particle diffusion, where we measure the distances between diffusing [[particles]]  at a fixed point or a point moving with the mean fluid [[velocity]], and where the mean-square  particle displacement initially increases rapidly with time (e.g., linearly); and 2) two-particle diffusion,  where we measure the distances between particle pairs or the dimensions of a cloud of  diffusing particles. Here the mean-square distance initially increases more slowly (e.g., as the 5/  2 power of the time).</div><br/> </div>
+<div class="definition"><div class="short_definition">(''Or'' eddy diffusion.) [[Diffusion]] or [[dispersion]] due to the effects of turbulent  motions.</div><br/> <div class="paragraph">When quantifying turbulent diffusion, it is important to distinguish between two types of  measurement: 1) single-particle diffusion, where we measure the distances between diffusing [[particles]]  at a fixed point or a point moving with the mean fluid [[velocity]], and where the mean-square  particle displacement initially increases rapidly with time (e.g., linearly); and 2) two-particle diffusion,  where we measure the distances between particle pairs or the dimensions of a cloud of  diffusing particles. Here the mean-square distance initially increases more slowly (e.g., as the 5/  2 power of the time).</div><br/> </div>
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