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I want to nozzle a water flow and then diffuse it to slow the jet down. I.e. I need to maintain a pressure up to point and then diffuse it. If my diffuser is below the 7 deg included angle. Can anybody point me to some design guidelines for the diffuser. I.e. presumably I get to a point where...

I've finally got round to writing a program that will solve this problem, check out caided.co.uk , and you can download it. I've used VB for it and it needs MS office. The calculation is the wrong way around for this particular problem, i.e. you give it a mass flow and it calculates the area but...

mmm, be careful about the definition of choking. Its true definition is when no downstream pressure reduction further increases the mass flow through the 'nozzle'. increases in the upstream pressure, although not increasing the velocity at the throat (M=1 and assuming constant temp) fixes U but...