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A STUDY OF TURBULENT FLOW IN ROUGH PIPES.
ILLINOIS UNIV URBANA DEPT OF THEORETICAL AND APPLIED MECHANICS
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The considerable literature on turbulent flow past rough surfaces is correlated in terms of modes of presenting the smooth-to-rough transition and the influences of roughness density and shape. Flow measurements in a 3 in. smooth and sand roughened pipe and in an 8 in. steel pipe with natural roughness are reported. The temporal-mean velocity and friction measurements show transitional between smooth and fully rough behavior variations. The pipe factor variation is also elucidated the sand-roughened pipe studies indicate a shift in Nikuradses presentation. The turbulence - as intensity divided by shear velocity and macroscale in ratio to pipe radius - in rough pipe flow appears the same in rough as in smooth pipe flow. The relative turbulence intensity is constant, or at most decreases slowly with increase in flow Reynolds number. Author
APPROVED FOR PUBLIC RELEASE