Engineers need to know a drop in piezometric head that is required to make fluid flow at a certain steady rate through a straight pipe of uniform diameter of a certain length. The drop in piezometric head can be estimated using Darcy-Weisbach formula. One of the key parameter in this formula is a Friction Factor. In this video I show you how to estimate the friction factor using semi-empirical Colebrook-White equation.
First many thanks for this video, you answered many questions I had in mind, still one if you can explain. I found in a random source that the initial value of f=0.0637.Re^-0.21. if you can confirm this information
Sir, normally in colebroke white equation is used -2log10 while you use -4log 10 in first part of equation and 2nd part normal value is 2.51 while you use 1.26, please explain about these changes.
When I use this method it does not correlate to moody diagram. When I change to the rearrangement to 1/(-2log(k/3.7+2.51/Re*f^0.5)))^2 I get a correlation with the Moody diagram
Fanning friction factor for pipe flow is one-fourth of the Darcy friction factor, so attention must be paid to note which one of these is meant in the "friction factor" chart or equation consulted. Depending which one you use Colebrook-White equation would be slightly different. You need to check which one you use.
@@StudyTips4U Ah hah I see. Thanks very much. In my case I am comparing to the moody chart so the Darcy friction factor is relevant and my adjustment of CW now makes sense
After many years in Engineering I still go back sometimes and revisit those equations. Good job!
Thanks!
This was a great example of how to use the Colebrook equation - thank you.
Engineers need to know a drop in piezometric head that is required to make fluid flow at a certain steady rate through a straight pipe of uniform diameter of a certain length. The drop in piezometric head can be estimated using Darcy-Weisbach formula. One of the key parameter in this formula is a Friction Factor. In this video I show you how to estimate the friction factor using semi-empirical Colebrook-White equation.
This is a good video. I like to revisit this as a reminder.
Very helpful. Thanks a lot. I will be using this to solve other problems where I need to use iteration method.
Glad it was helpful!
Looks great!
Glad to hear it is helpful.
Great Very Helpfull If you can help to explain 2 K method and 3 K method of Friction calculations Thank you in advance
thank you so much , that was a great help .
First many thanks for this video, you answered many questions I had in mind, still one if you can explain. I found in a random source that the initial value of f=0.0637.Re^-0.21. if you can confirm this information
hope you could share your spreadsheet. thanks in advance.
Yes no problem. It is on my work PC. Please send me another comment after Easter and I will post a link in video description
We're waiting for your feedback Paul...
@@StudyTips4U, can i text to you instead? ❤
@@TheMrmuratsahin What kind of feedback? Spreadsheet?
@@StudyTips4U yes please, if still suitable (accessible)?
Actually, I was not given the diameter and friction factor, and I wanted to find out how I can make friction the constant
Sir, normally in colebroke white equation is used -2log10 while you use -4log 10 in first part of equation and 2nd part normal value is 2.51 while you use 1.26, please explain about these changes.
There are two coefficients: Darcy-Weisbah and Fanning and Colebrook-White equation is different depending which coefficient you use
@@StudyTips4U Thanks for your explanation. will comeback if I need more discussion.
When I use this method it does not correlate to moody diagram. When I change to the rearrangement to 1/(-2log(k/3.7+2.51/Re*f^0.5)))^2 I get a correlation with the Moody diagram
Fanning friction factor for pipe flow is one-fourth of the Darcy friction factor, so attention must be paid to note which one of these is meant in the "friction factor" chart or equation consulted. Depending which one you use Colebrook-White equation would be slightly different. You need to check which one you use.
@@StudyTips4U Ah hah I see. Thanks very much. In my case I am comparing to the moody chart so the Darcy friction factor is relevant and my adjustment of CW now makes sense