Pressure through pipe orifice

[tmartin125]

Hello,

I am looked for resistance coef (k) values for calculating pressure of a hole in the wall of a pipe. Is this the same as k values for an orifice in a pipe? This is for a design of cooling spray around a shaft. The cooling water will be directed through a circular pipe around the shaft with orifice holes in the pipe spraying the water into the shaft bearing. I need to calculate the pressure through the orifice. Any help is appretiated.

Thanks

Travis

 

[Latexman]

My old design manual says pressure drop through a distributor pipe (pipe with holes in it) is about 2.8 velocity heads based on the orifice velocity.

If the total flow thru the holes gives significant pressure drop along the distributor pipe, you'll have to iterate to get a good supply pressure for the orifices.

Good luck,
Latexman