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In fluid mechanics, external flow is such a flow that boundary layers develop freely, without constraints imposed by adjacent surfaces. Accordingly, there will always exist a region of the flow outside the boundary layer in which velocity, temperature, and/or concentration gradients are negligible.
Additional recommended knowledge
An example includes fluid motion over a flat plate (inclined or parallel to the free stream velocity) and flow over curved surfaces such as a sphere, cylinder, airfoil, or turbine blade.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "External_flow". A list of authors is available in Wikipedia.|