3 25 2 15 1 05 0 05 1 15

Figure 17: Efficiency factor, h = (St/Sto)/(cf/cfo), vs. statistical skewness of roughness. Data for 6 rough surfaces at Tu = 1%, 5%, & 11% for Re=900,000 only. Polynomial fits to all but surface #2 data.

Synergisitic (Data) ■S—Compound Estimate ■A— Additive Estimate

\ A

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