Velocity distribution in turbulent flow

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No exact mathematical analysis of the conditions within a turbulent fluid has yet been developed, though a number of semi-theoretical expressions for the shear stress at the walls of a pipe of circular cross-section have been suggested.

The velocity at any point in the cross-section will be proportional to the one-seventh power of the distance from the walls. This may be expressed as follows:

Where ux is the velocity at a distance y from the walls, uCL the velocity at the centerline of pipe, and r the radius of the pipe.

This equation is referred to as the Prandtl one-seventh power law.

By using Prandtl one-seventh power law, the mean velocity of flow is found to be equal to 0.817 times the centerline velocity.

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Last Modified on: 14-Sep-2014

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