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Old   June 8, 2001, 06:21
Default wall roughness
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Hi folks, can anyone tell me the wall roughness value (k) which corresponds to hydrodynamically smooth pipes? Does the value for drawn tubing (0.0000015 m) correspond to this or should it be less? Thanks in advance!
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Old   June 8, 2001, 18:20
Default Re: wall roughness
John C. Chien
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(1). Take a look at the book by Schlichting, "boundary layer theory". Chapter-turbulent flow through pipes. (2). hydraulically smooth regime: 0 less,equal, (ks * v*/nu), less,equal 5.
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Old   June 14, 2001, 19:48
Default Re: wall roughness
clifford bradford
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Wilcox's turbulence modelling book answers this
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