# Flow in a pipe with a tank on its top, and a nozzle on its bottom

1. Apr 25, 2012

### ecm00

I have a tank filled with water on the top of a pipe (height of water = h)
there's a hole in the bottom of the tank, so that when the hole is suddenly opened, water will flow in the pipe of length 20 meters
at the bottom of the pipe, there's a nozzle (I dont know how to choose the right nozzle diameter in order not to restrict water flow, and to increase water speed)
the jet from the nozzle will hit a pelton turbine of 20 cm diameter

I want to get about 1000 rpm from the turbine. How can I choose the height of water in the tank and the nozzle diameter? Is 1000 rpm achievable?

2. Apr 25, 2012

### davenn

any sort of nozzle is going to restrict the flow, cant be any other way that I can see. The least restriction is when the outlet diameter of the pipe is unchanged

Dave

3. Apr 25, 2012

### ecm00

thx!
so how should I choose the diameter of my nozzle? how to reach 1000 rpm?

4. Apr 25, 2012

### davenn

Thats beyond my knowledge, I dont know if it can be done or not.

D

5. Apr 25, 2012

### Travis_King

That depends on the spec of your turbine, whatever it's attached to, and the "h" of your tank.