View source for One-way entrainment process



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== 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  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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