Boundary layer effect
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The Boundary layer effect is the field region in which all changes occur in the flow pattern. The boundary layer distorts surrounding nonviscous flow. It is a phenonomen of viscous forces. This effect is related to the Leidenfrost effect and the Reynolds number.

This effect is exploited in the Tesla turbine.

The original article can be found at: http://en.wikipedia.org/wiki/Boundary_layer_effect.
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