Fluid flow and elevation vs pressure

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SUMMARY

The discussion focuses on the relationship between elevation change and pressure loss in pipes, specifically addressing hydrostatic pressure and head loss due to flow restrictions. The user presents experimental data of a negative gradient graph and seeks supporting research. Key equations and coefficients related to hydrostatic pressure are discussed, including the use of the gravitational constant (g = 9.8 m/s²) and water density (1016 kg/m³). Relevant resources such as Wikipedia articles on vertical pressure variation and Pascal's law are provided for further understanding.

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  • Understanding of hydrostatic pressure principles
  • Familiarity with fluid dynamics and head loss concepts
  • Knowledge of basic hydraulic systems and pipe flow
  • Ability to interpret experimental data and graphs
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  • Research hydrostatic pressure equations and their applications
  • Study the principles of head loss in pipe systems
  • Learn about fluid dynamics simulations using software like ANSYS Fluent
  • Explore advanced topics in fluid mechanics, such as Bernoulli's equation
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Engineers, fluid mechanics students, and researchers involved in hydraulic system design and analysis will benefit from this discussion.

lifeisstrange444
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Hey guys! does anyone have a graph of the relationship between elevation change and pressure loss in pipes? I currently have experimental data of a negative gradient graph. know it's theoretically correct however, I just need supporting research for this - have tried finding everywhere but can't find it
 
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Welcome to PF.

There are many interpretations of your question. I wonder what you mean.
Are you referring to hydrostatic pressure reduction, or a head loss due to flow restriction?

Please describe the hydraulic system, and attach the "negative gradient graph" to your next post.
 
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Likes DeBangis21 and russ_watters
Hi, a change in pipe elevation. My setup is currently; horizontal pipe into vertical pipe and from the vertical pipe into another horizontal pipe. The last pipe is in partial flow and so im assuming the pressure is atmospheric pressure. I am then backtracking to find P1 (original pressure) - and finding the change in pressure due to the elevation. Attached is my graph - would really appreciate your help, thank you
Screenshot 2024-01-06 at 3.16.47 PM.png
 
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That appears to be hydrostatic pressure. The equation is here.
https://en.wikipedia.org/wiki/Vertical_pressure_variation

Your coefficient 9961.4 should be close to g * density.
For g = 9.8 m/s2 the liquid is water, with a density of 1016 kg/m3.

What "supporting research" do you require for something so fundamental ?
 

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