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

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Discussion Overview

The discussion revolves around the flow of water from a tank through a pipe to a nozzle, specifically focusing on how to select the nozzle diameter to optimize water flow and achieve a target rotational speed of 1000 rpm for a Pelton turbine. The conversation includes considerations of fluid dynamics and the relationship between tank height, nozzle size, and turbine performance.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant describes a setup with a tank of water, a pipe, and a nozzle, seeking to determine the appropriate nozzle diameter and tank height to achieve 1000 rpm from a Pelton turbine.
  • Another participant asserts that any nozzle will restrict flow, suggesting that the least restriction occurs when the outlet diameter remains unchanged.
  • A subsequent participant expresses uncertainty about how to choose the nozzle diameter and whether achieving 1000 rpm is feasible.
  • Another reply indicates that the feasibility of reaching 1000 rpm depends on the specifications of the turbine and the height of the water in the tank.

Areas of Agreement / Disagreement

Participants express differing views on the impact of nozzle diameter on flow restriction, and there is no consensus on how to achieve the desired turbine speed or the specific parameters required.

Contextual Notes

Participants do not provide specific mathematical relationships or empirical data to support their claims, leaving assumptions about fluid dynamics and turbine specifications unresolved.

ecm00
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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 don't 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?
 
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ecm00 said:
at the bottom of the pipe, there's a nozzle (I don't know how to choose the right nozzle diameter in order not to restrict water flow, and to increase water speed)

any sort of nozzle is going to restrict the flow, can't be any other way that I can see. The least restriction is when the outlet diameter of the pipe is unchanged

Dave
 
thx!
so how should I choose the diameter of my nozzle? how to reach 1000 rpm?
 
ecm00 said:
thx!
so how should I choose the diameter of my nozzle? how to reach 1000 rpm?

Thats beyond my knowledge, I don't know if it can be done or not.

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

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