There is a lot of formulas for this function...
But what is it delta!? How can we messure it!?
I have an english version of MCS:
henry leung wrote:
Mathcad 3.0 is released?
Not yet. We will get it in sommer. I hope. I wort with beta-version.
Actually I do not know ! There are tabulated value of absolute roughness of different piping material of NEW pipe...as the pipe ages/corrode/get deposite etc. ...then of course its roughness changes
I think you can do experiment to re-measure the roughness. But since we can only measure pressure drop as far as I know....it is like collecting pressure drop data and fitting a "rougness" parameter for what ever function you use to model pressure drop.
But maybe there are special way to actually measure "roughness"? Hope some industry professional can address your question. Besides, how much attention does the industry pay to the absolute roughness of aging pipe? Or they just pay attention to the pressure drop since this is the ultimate properties that impact $$$$$$?
But we need (have) to design pipelines - someone is better then nothing!
Mathcad 11 Server http://twtmas.mpei.ac.ru/mas/Worksheets/Hydro/La_De_Re.mcd
Mathcad 14 Server http://twt.mpei.ac.ru/MCS/Worksheets/Hydro/La-De-Re.xmcd
It is the region NaN on the function Lambda.friction(Delta, Re) - see above the template Friction-Delta-Re