Abstract
AbstractA non‐disturbing technique has been used to measure turbulence parameters in a smooth pipe and in two randomly roughened pipes at the same apparent wall shear.Near the wall, large eddies are significantly more intense in smooth than in rough pipes while the small eddies are more intense in rough than in smooth pipes. No viscous sublayer was visible in the rough pipes. In the core, large apparent differences in large scale eddy structure were found between rough and smooth tubes, but the differences probably result from the inappropiate inclusion of dissipation due to form drag in u*.
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