What type of gauge will measure "exit" water Pressure?
Answer:
Technically, the pressure of water once it leaves the nozzle will be exactly 1 atmosphere. When water leaves the nozzle, it turns the entire energy stored as water pressure in the nozzle into kinetic energy.
Unlike water, which is incompressible, gases are compressible and will maintain some pressure briefly coming out of the nozzle, e.g. not all the pressure is turned into kinetic energy, so having a gauge outside a gas nozzle would be useful to measure the exit pressure.
What you really want is a gauge just _inside_ the nozzle, which will measure the pressure in your compressor minus the pressure drop related to the water flow rate in the nozzle. I assume this would be easy for you to do.
More elegantly, if you are sure your nozzles are identical, it would be easier to just rig a FLOW meter to each one. As long as the flow rates are identical, each nozzle output should behave identically.
You can use a pressure gauge and set up a venturi meter at the end of each nozzle.
The easiest way to ensure the pressure is the same at all four nozzles is to use four identical hoses all connected to the same water source, with four identical nozzles.
However, this does not tell you what the pressure actually is. If you drilled a hole into the nozzle, perpendicular to the direction of water flow, and attached a waterproof pressure gauge, it would tell you the static pressure of the water.
The dynamic pressure of the water is found by
1/2*rho*v^2
where rho is the density of water, and v is the velocity.
total pressure = static pressure + dynamic pressure
Pito Gauge. Used by the fire department to measure the exiting water pressure at fire hydrant.
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