Formula for Shear stress in a turbulent flow - Fluid Mechanics

Q.  Shear stress in a turbulent flow is given by the formula

τ = η (du / dy)

Where η (eta) is,

- Published on 05 Aug 15

a. eddy viscosity
b. apparent viscosity
c. virtual viscosity
d. all of the above

ANSWER: all of the above


  • Pankaj   -Posted on 29 Sep 15
    The expression for shear stress in turbulent flow was developed by J. Boussinesq. It is similar to the Newton's law of viscosity and expressed as,

    τ = η (du / dy)

    u = Average velocity at a distance y from boundary

    and η (eta) = Turbulent coefficient of mixing is also called as eddy viscosity or apparent viscosity or virtual viscosity.

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