Equivalent flow through orifice
Equivalent flow through orifice
(OP)
I posted before about noise levels through an orifice containing about 150 small holes. Testing has confirmed that the measured dBA are not significantly higher with a single orifice. However the single orifice they used was just scrap and not designed specifically for our application. I need to design that orifice and want to keep pressure drop and flow through it equivalent to the multi-holed one.
I can calculate equivalent area, but I don’t know how to estimate the flow coefficient through something that has multiple passages. Any ideas for how to proceed?
I can calculate equivalent area, but I don’t know how to estimate the flow coefficient through something that has multiple passages. Any ideas for how to proceed?





RE: Equivalent flow through orifice
The noise benefit usually derived from multihole nozzles is related to a dilution of the noise generating, shear flow from the holes over a larger cumulative perimeter and by some noise cancellation within the total stream. It is most noticable when the orifices discharge to atmosphere and the noise is not attenuated by the equipment.
David