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- Trying to calculate required gas flow through a given nozzle....

I am in need to calculate the required gas flow for a given nozzle orifice. In laser cutting we use various "nozzle orifice sizes" to cut different materials. For example, when cutting 1/4" mild steel we would use a 5mm orifice nozzle using 20 bar. I would like to make a calculator in excel that you just plug in the nozzle orifice size and pressure required. The calculator would then tell you the flow rate in SCFM or SCFH and the minimum pressure that is required to maintain this flow and pressure.

Any help would be awesome! thank you!

Any help would be awesome! thank you!