Civil Engineers with Experience Using the Colebrook Equation?

[Csaba Tizedes]

My "ABC-method" from my university years (yes, I was VERY proud for my 12 steps fixed point iterative method ) - check the attached picture.

I made a quick English printout with an example to show how fast the iteration is. There is no any accuracy checking and the program makes one step only, because these calculators had only few dozens of memory.

Typically the first three-four iteration is good enough.

You must to know this formula is used for pipe flows where the cross section fullfilled with fluid. Rule of thumb: for water f=0.025 is a good approximation and f=0.02 ... 0.03 range is typically OK, your 0.59 is too high. You made a mistake during calculation or used non-consistent units, maybe Reynolds-number calculated with wrong viscosity (kinematic vs. dynamic), etc...

Csaba
(a fluid flow mechanical engineer)