One-way entrainment process

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<div class="definition"><div class="short_definition">At the [[interface]] between a [[turbulent boundary layer]] and a [[laminar  boundary layer]], laminar air is incorporated into the turbulent layer, but none of the turbulent  air is incorporated into the laminar layer.</div><br/> <div class="paragraph">This causes the turbulent layer to get thicker as it erodes the laminar layer. Such a process  explains why turbulent boundary layers increase [[thickness]] (because laminar air from the [[free  atmosphere]] and [[capping inversion]] are incorporated into the [[mixed layer]]) and why [[air pollutants]]  are trapped in the mixed layer (because none of the turbulent mixed layer air can carry  pollutants into the laminar air).</div><br/> </div>
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<div class="definition"><div class="short_definition">At the [[interface]] between a [[turbulent boundary layer]] and a [[laminar boundary layer|laminar  boundary layer]], laminar air is incorporated into the turbulent layer, but none of the turbulent  air is incorporated into the laminar layer.</div><br/> <div class="paragraph">This causes the turbulent layer to get thicker as it erodes the laminar layer. Such a process  explains why turbulent boundary layers increase [[thickness]] (because laminar air from the [[free atmosphere|free  atmosphere]] and [[capping inversion]] are incorporated into the [[mixed layer]]) and why [[air pollutants]]  are trapped in the mixed layer (because none of the turbulent mixed layer air can carry  pollutants into the laminar air).</div><br/> </div>
 
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Latest revision as of 18:32, 25 April 2012


[edit] one-way entrainment process

At the interface between a turbulent boundary layer and a laminar boundary layer, laminar air is incorporated into the turbulent layer, but none of the turbulent air is incorporated into the laminar layer.

This causes the turbulent layer to get thicker as it erodes the laminar layer. Such a process explains why turbulent boundary layers increase thickness (because laminar air from the free atmosphere and capping inversion are incorporated into the mixed layer) and why air pollutants are trapped in the mixed layer (because none of the turbulent mixed layer air can carry pollutants into the laminar air).

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