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Eddy Viscosity

•    It is not the property of fluid. It is function of fluid properties as well as the functional characteristics of flow. i.e. turbulence of flow and may vary form point to point.

•    The magnitude of eddy viscosity may vary from zero (if the flow is laminar) to several thousand time of μ (coefficient of viscosity) for turbulent flow.

•    The total shear stress is the sum of viscous shear and the turbulent shear and is expressed as,

τ  =  Viscous shear + Turbulent shear

τ  =  μ. du / dy + η. du / dy

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