My vocabulary is pretty bad in specialized English, so I have to post a picture of problem
There are three pipes, the cross-section changes and all measures are illustrative, I need to find an easy formula to find the diameter of d3, so I can create formula in Excel and by changing numbers it calculates the answer.
Formulas are from topic of momentum and forces,
Maybe this helps
δ= M/W ⩽ δ[adm]
The Attempt at a Solution
It should become something like ω/M max * some coefficients, but I havent found anything form books.