UHP water jetting and calculating kinetic energy

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Discussion Overview

The discussion revolves around calculating the velocity of water streams exiting orifices under high pressure (60 ksi) and exploring the kinetic energy associated with those streams. It includes considerations of flow dynamics, energy dispersion, and potential impacts on targets, with a focus on both theoretical calculations and experimental validation.

Discussion Character

  • Technical explanation
  • Mathematical reasoning
  • Experimental/applied

Main Points Raised

  • One participant inquires about the velocity of water streams from two orifices under specified conditions, seeking calculations for both scenarios presented.
  • Another participant requests additional details and a diagram to better understand the problem before providing assistance.
  • A participant describes two scenarios involving solenoid valves and asks for the velocity and power of the streams from each nozzle, while noting the assumption of smooth, laminar flow.
  • There is a question about the specific energy dispersion rate from the nozzle tip to the atmosphere.
  • One participant references a research paper that provides a calculation for a single orifice at high pressure, mentioning a measured velocity of 916 m/s, and expresses interest in further exploring the impact of the water stream on a human body.

Areas of Agreement / Disagreement

The discussion remains unresolved, with participants expressing varying levels of detail and inquiry without reaching consensus on the calculations or implications of the water streams.

Contextual Notes

Participants have not provided a complete set of assumptions or a clear diagram, which may limit the ability to accurately calculate velocities and energy dispersion rates. The discussion also lacks clarity on the specific conditions affecting flow dynamics.

Who May Find This Useful

Individuals interested in fluid dynamics, high-pressure water jet applications, and experimental validation of theoretical models may find this discussion relevant.

Canagman
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If i compress water to 60 ksi, and push it through a 0.015" sharp orifice, then i have another orifice 2 feet before that sudden open to 0.015", what is the velocity of the stream from each orifice?
 
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You'll have to tell us more before anyone on PF can give you a proper answer .

Please post a more detailed description of the problem and a clear diagram .
 
I have drawn this in metric units.
Scenario # 1 (Solenoid valve 2 opens, pump is supplying noted pressure to water)
What is the velocity of the stream exiting attached nozzle? Power of stream?
Scenario # 2 (Solenoid valve 1 opens...Valve 2 stays open)
What is the velocity of each nozzle? Power of each stream?
And yes, smooth, laminar flow...note that i have not added a system relief just to simplify.

Thank you in advance
question.jpg
 
In addition, is there a specific energy dispersion rate from the nozzle tip to atmosphere?
 
Have you got a drawing of the orifice and nozzle ?
 
no i do not, however i did stumble upon a research paper has the calculation and 420 MPa, 1 mm orifice = 916 m/s this was verified thru CFD and measured using phase Doppler anemometry...that was thru a single orifice...i need look thru the rest of the formulae and work thru the impact of that water stream on a human body...

Regards
 

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