I have rewritten the Scaled Colburn Analogy Asymptote section to address the Convection Machine measurements at low Reynolds numbers:
The logarithmic scale amplifies the variances below Re=10000. The graph below shows Nu/Pr1/3 on a linear scale where variations can be seen as comparable in magnitude to the variation between experiments where Re is larger than 10000.
The revised formula, which includes the Re range over which the surface should be treated as rough, is:
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