The formula you showed is not recursive. Can you be more specific about the issue? Can you provide the Excel worksheet you are talking about?
What do you mean by a reference? Do you mean a source that provides and explains a formula? I was able to find this:
https://www.sciencedirect.com/topics...riction-factor The references to Moody seem to more along the lines of a type of graph rather than a scalar factor.
Your question is a pretty esoteric engineering question rather than an Excel question, so you may have better luck on engineering forums.
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