aid for calculation of the vein contraction coefficient

[stabum]

Hello everyone,
I need a really important help. This is to calculate the coefficient of contraction of vein cc( cc = oat counterattack/a2) concerning a cylindrical piping ending with a converging tract. the wall of the pipe is thin, the veicolate fluid is water, the environment in which the fluid is poured is air in quiet. the characteristic dimensions of the converging tract are:
d1 = 231.221 mm
d2 = 206.000 mm
l = 27.628 mm (distance between the extreme sections of the converging section
alternatively the characteristic corner of the convergent is 24.534°

I searched in my book of plumbing (a. jets) and on the internet, but I found nothing particularly close to the geometry of my problem.
thanks to all those who can help me. Thank you very much.

 

[Paolo Molniya]

by manual embroidery that cc=0.78 about, considering a hole connected instead of tapered

 

[eih64]

if it can help you

 

[stabum]

Thank you very much paolo molniya and eih64 for the prompt response and help. tutavia the diagram of eih64 (of gregoretti) refers to a minimum beta value of 45°, while, unfortunately, in my case it is of 25° if only it was possible to find a diagram similar to that which contains the case of beta = 25 (or minor) would be perfect... .
for what concerns the page of the paolo hoepli manual, if I have not understood badly, the tables shown refer to the case of light on vertical wall (outflow under paratories), which is unfortunately not my case, in the sense that the coefficient I look for must by force depend on the geometry at stake and, in particular, on the value of the beta angle of convergence of the nozzle.

Thank you, really, everyone... I'm sorry to break the boxes to so many people, but I really looked everywhere without finding the answer I need great.
Thank you again!

 

[eih64]

The material seems interesting to me. :biggrin:

 

[stabum]

m-e-r-a-v-i-g-l-i-o-s-o!! !
p-e-r-f-e-t-t-o!! !
S-t-r-a-o-r-d-i-n-a-r-i-o! !


You simply saved my life!!!
a big hug!!! if you pass for padova... Shall we get a spritzer?

 

[eih64]

m-e-r-a-v-i-g-l-i-o-s-o!! !
p-e-r-f-e-t-t-o!! !
S-t-r-a-o-r-d-i-n-a-r-i-o! !


You simply saved my life!!!
a big hug!!! if you pass for padova... Shall we get a spritzer?

Sure. I spend a lot of time there. good work:finger: