Colebrook-White Equation Calculator
Calculates the root of Colebrook-White Equation using Simple and TRUE method. | ||
The Simple and TRUE method is provided by Harrell Geron as a Federal NRCS, USDA engineer. |
Colebrook-White Equation
| [1-5] /5 | Disp-Num |   |
- Purpose of use
- For teaching purposes:
--> comparison of solution obtained by means of Moody's Diagram and iterative solution of Colebrook - White equation.
--> so that my students can calculate faster the pressure drop in buildings instalations - Comment/Request
- Thanks for the calculator!!
Maybe not too bad, but the solution given for Re < 2000 is not equal to 64/Re. I know it is not necessary to use the Colebrook - White equation in this case, but anyway, it should give an accurate solution, isn't it?
[1] 2014/11/07 02:56 Male / 30 years old level / A teacher / A researcher / Very /
- Purpose of use
- to check manual calculation
- Comment/Request
- please calculate using Colebrook-White equation the
maximum flow capacity & velocity of
pipe size 0.225m. diameter vitrified clay pipe
with gradient of 1/22.
[2] 2014/05/09 12:34 Male / 60 years old level or over / An office worker / A public employee / A little /
- Purpose of use
- If the user selects a mode other that 2.51, then the display of the mode would be good. But it only shows the 2.51 mode.
Also you said you were using 3.71 where I had emailed the "Rr/3.7", but you were using the 3.71 mode.
Today someone asked for the "9.35" mode. and I showed them how, but the screen showed the 2.51 mode, and they wanted to see that equation. - from Keisan
- We have changed to be displayed the formula corresponding to the selected mode.
[3] 2013/11/01 03:27 Male / 60 years old level or over / An engineer / Very /
- Comment/Request
- I tried the Newton compute again, and noticed I could set it for 50 digits like I did.
I did 3 random Rr and Rn and found out that the Newton gets the same answer as I do for 50 digits.
I checked the left and right for each and found they have the same "checked" values also.
I want the Public to learn my easy and true solution, then they could compute their own designs.
[4] 2013/10/04 00:37 Male / 60 years old level or over / A engineer / Very /
- Purpose of use
- The Newton method is fair, but not exactly right.
Here's my easy solution. It works in Excel for 15 digits. Your computer shows 50 digits and it proves I am right. Here's that Rn, and Rr solved
Rn=604133;
Rr=0.01002;
A=Rr/3.7;
B=2.51/Rn;
Loops=0;
D=3; do {X=-2*log(A+B*D);
Loops=Loops+1;
D=-2*log(A+B*X);} while (X<>D);
f=1/X/X;
Left=1/sqrt(f);
Right=-2*log(Rr/3.7+2.51/Rn/sqrt(f));
Loops;
f;
Left;
Right;
10 loops
f= 0.038030096166348760840839356634286786195821313985827
left side of equation '5.1278615179514698534039181406746481344220332448845
right side of equation '5.1278615179514698534039181406746481344220332448845
Left=Right so it is proved right. - Comment/Request
- Post this to everyone
My Excel training is
colebrook-white.blogspot.com
Thanks, Your computer helps me prove I am right. - from Keisan
- We changed Rr/3.7 instead of Rr/3.71 in Colebrook-White Equation.
New results are the same as your results.
1/sqrt(f))=-2*log(Rr/3.7+2.51/Rn/sqrt(f))
[5] 2013/10/02 10:02 Male / 50 years old level / A engineer / Very /
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