Underwater jet 1

[geg1633]

Are there any methods to evaluate behavior of pressurized jet underwater? I'm trying to evaluate velocities and velocity distribution of jet coming out of a circular nozzle underwater.
Any suggestions welcome.
Thanks
Greg

 

[francesca]

The Bernoulli Equation should apply.

If you're feeling particularly scholarly, this pdf file might help. It's a paper from Stanford's Center for Turbulence Research. I should point out that I only skimmed it, and can't attest to its relevance.

 

[BRIS]

Actually there are large energy losses and the Bernoulli Equation does not apply. Overall estimates could be made by momentum balance but this will not give you velocity distributions. I have a simple reference somewhere - I will dig it out.

 

[BRIS]

. What I have in front of me is Paper No 2409 from the American Society of Civil Engineers "Diffusion of submerged Jets" by Alberston, Jensen and Hunter Rouse dated 1948 - plus written discussions by Holderson, Citrini, Bains and Henry - these papers give you exactly what you are looking for including distribution curves and formulae but I am sure you can find a simple summary in a modern text book. -

 

[geg1633]

Thanks Bris! Is there any way that you can fax it to me, if it's not a thick paper?

 

[BRIS]

geg1633 - sorry I am in Yemen - so not easy - also it is useful to see the duiscussions as well as the original paper. It is very much one of the classic papers of hydraulics - plenty of references to it on the internet and it should be available in any good technical library.