Measurements of mean longitudinal velocities, static pressure, turbulence quantities and Reynolds shear stress were made in the region between fully-developed smooth wall and rough wall flows in a circular tube. The rough tube was formed by placing rectangular cross-sectioned rings inside a smooth pipe. A phenomenological model was developed to describe the flow in the region of change. The longitudinal pressure gradient responds very rapidly (within a couple of diameters) to the new wall roughness. The effect on the mean and fluctuating velocity parameters was found to grow with the half-power of the longitudinal distance from the start of the roughened tube for the case when the initial roughness element is upstanding.
Response of a Turbulent Pipe Flow to a Change in Roughness
W. D. Siuru, Jr.,
W. D. Siuru, Jr.
USAF; U. S. Military Academy, West Point, N.Y.
E. Logan, Jr.
Mechanical Engineering, Arizona State University, Tempe, Ariz.
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Siuru, W. D., and Logan, E. (September 1, 1977). "Response of a Turbulent Pipe Flow to a Change in Roughness." ASME. J. Fluids Eng. September 1977; 99(3): 548–553. https://doi.org/10.1115/1.3448842
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