1 reply to this topic

[stu]

Dear sir,
Normally in nozzle what is the condition of pressure and velocity in inlet & outlet of the nozzle.
Please explain
Thanks
Stu

[Adriaan]

Normally in nozzle what is the condition of pressure and velocity in inlet & outlet of the nozzle?

1. There are a great many different kinds of nozzles (materials used, spray pattern produced, flow/pressure design values) and the pressure REQUIRED to give the desired spray pattern depends on this design; if the pressure is too low you do not get the desired pattern
2. The MAXIMUM pressure depends on two things; first the absolute upper limit is the material strength of the nozzle (obviously), the secondary limit depends on the design (a further pressure increase beyond that point doesn't give a flow increase)
3. nozzles wear out, changing the spray pattern and flow (and therefore pressure difference)
4. nozzles can foul up, changing the spray pattern, increasing the pressure at the inlet, lowering the flow
5. nozzle performance depends on the medium used, pre-heating the medium changes the viscosity and that in turn changes the pressure etcetera.

So... the NORMAL conditions depend on a range of factors. Check nozzle manufacturer specifications (go to http://www.duesen-sc...p?cat=66&cl2=66 for example) against your process' requirements.

Oh and next time try to provide some more information in your question so you can be given a more specific answer?