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Physically the momentum thickness may be conceived as transverse distance by which the boundary should be displaced to compensate for the reduction in momentum of the flowing fluid on account of boundary layer formation.
Wiki User
∙ 16y ago
Wiki User
∙ 15y agoMomentum thickness is a physical length scale to quantify the effects of fluid viscosity in the vicinity of the boundary layer. It is the distance that the flow would be displaced by to have the same momentum as an ideal fluid. A no slip condition at the wall and a known velocity profile can be used with the differential of momentum thickness with distance to calculate (local) wall shear stress. This expression can be integrated over a length to find total drag.
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