tag:blogger.com,1999:blog-556833631320407835.post4034828492627600350..comments2012-04-11T15:24:07.412-07:00Comments on YOUR ROAD TO Colebrook-White Equation: An Introduction to Colebrook Equation and its solutions using MS ExcelOptimisations Indianoreply@blogger.comBlogger1125tag:blogger.com,1999:blog-556833631320407835.post-78386405039582636292010-11-02T06:58:49.409-07:002010-11-02T06:58:49.409-07:00As author of the referenced articles, http://http/...As author of the referenced articles, http://http//www.cheresources.com/colebrook1.shtml, I'm requesting assistance in updating explicit equations portions of that series. My problem is that I have been unable to verify the accuracy of the Goudar - Sonnad equation. I have attempted to enter the equations in an Excel spreadsheet but the results are not to the stated accuracy.<br />Specifically, I have tried to test Goudar against Serghide at the point of maximum error in Serghide, which is at Rel Roughness of 0 and Reynolds Number of 171,000. As I have entered the formulas, I get a result from Goudar of f = .0162416. An iterative solution would yield f = .0161281. Back substitution of these results into the original Colebrook equation would suggest that the iterative solution is more accurate.<br />I'd appreciate any comments or assistance.Tom Lesternoreply@blogger.com