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Johann Nikuradse. LAWS OF FLOW IN ROUGH PIPES 95%

He further determined that for greatly roughened surfaces the quadratic law of friction is effective as soon as turbulence sets in.

https://www.pdf-archive.com/2019/11/12/johann-nikuradse-laws-of-flow-in-rough-pipes/

12/11/2019 www.pdf-archive.com