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FRICTION FACTOR. SKIN-FRICTION COEFFICIENT


Friction factor. Skin-friction coefficient

A dimensionless number characterizing the frictional force at the boundary between fluid and a wall; it is defined by the identity:
a) in the case of flow in pipes


b) in the case of external flow past a body

where σw is the shear stress at the surface of the body (wall); ρ is the density of the fluid; w0 is the characteristic velocity of the flow (in the case of flow in pipes, it is the average value over the cross section; in the case of external flow past a body, it is the value in the external flow).
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