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From tests with commercial pipes recommended values

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Unformatted text preview: 80,000 40,000 60,000 100,000 Complete turbulence, rough pipes 0.05 0.04 0.07 0.06 0.03 Lam flow inar 64 Re Friction factor f = ( h L V2 d 2g ( = 0.01 0.008 0.006 Recr 0.03 0.004 0.025 0.002 0.001 0.0008 0.0006 0.0004 0.02 Sm 0.015 oo th p ip 0.0002 es 0.0001 0.000,05 0.01 0.009 0.008 Relative roughness ε d 0.04 0.02 0.015 f 0.05 103 2(103) 3 4 56 8 104 2(104) 3 4 56 8 105 2(105) 3 4 56 Reynolds number Re = Fig. 6.13 The Moody chart for pipe friction with smooth and rough walls. This chart is identical to Eq. (6.64) for turbulent flow. (From Ref. 8, by permission of the ASME.) Material 2(106) 3 4 56 8 107 2(107) ε = 0.000,001 d Vd ν Condition Iron Brass Plastic Glass Concrete Rubber Wood ft mm Sheet metal, new Stainless, new Commercial, new Riveted Rusted Cast, new Wrought, new Galvanized, new Asphalted cast Drawn, new Drawn tubing — Smoothed Rough Smoothed Stave Steel Table 6.1 Recommended Roughness Values for Commercial Ducts 8 106 0.00016 0.000007 0.00015 0.01 0.007 0.00085 0.00015 0.0005 0.0004 0...
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