Fred Lusk posted documents that evaluate the many formulas that can be used to obtain the Darcy friction factor explicitly. In the subsequent discussion, I proposed ranking the formulas in a different manner. However, my suggested change did not greatly change the ranking. Also, I have been able to locate some experimental data on commercial pipes operating in the transition region and found that the Colebrook-White formula does perform well for that region also.
Fred has asked to see my results which are attached to this discussion.
Fred, my modifications have messed up the page breaks and I haven't taken the time to make the file more presentable.
I plan on posting my evaluation of the CW formula against the Freeman data on my website blog soon. http://www.harveyhensley.com/ It will be a minor contribution compared to your document.
Update 6/1/2014: The blog mentioned above has been posted.
