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merac

June 8, 2001 06:21

wall roughness

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!

John C. Chien

June 8, 2001 18:20

Re: wall roughness

(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.

clifford bradford

June 14, 2001 19:48

Re: wall roughness

Wilcox's turbulence modelling book answers this

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