what's momentum thickness in flowing fluid
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to give the same total momentum as exists between the surface and the reference plane in a real fluid. are the density and velocity in the 'free stream' outside the boundary layer, and y is the coordinate normal to the wall. , which extracts energy from the mean flow.
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The momentum thickness, or , is the distance by which a surface would have to be moved parallel to itself towards the reference plane in an inviscid fluid stream of velocity , or. to give the same total momentum as exists between the surface and the reference plane in a real fluid.
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