Fluid flow and elevation vs pressure

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Discussion Overview

The discussion revolves around the relationship between elevation change and pressure loss in pipes, specifically focusing on hydrostatic pressure and head loss due to flow restrictions. Participants are exploring experimental data and seeking supporting research for their findings.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant requests a graph illustrating the relationship between elevation change and pressure loss, indicating they have experimental data showing a negative gradient.
  • Another participant seeks clarification on whether the inquiry pertains to hydrostatic pressure reduction or head loss due to flow restriction.
  • A participant describes their hydraulic setup involving a horizontal pipe transitioning to a vertical pipe and then back to horizontal, noting that the last pipe is in partial flow and assuming atmospheric pressure at that point.
  • One participant suggests that the situation appears to involve hydrostatic pressure and references an equation related to vertical pressure variation, questioning the need for supporting research on what they consider a fundamental concept.
  • A link to Pascal's law is provided by another participant, possibly as a reference to support the discussion.

Areas of Agreement / Disagreement

Participants have not reached consensus on the specific nature of the pressure changes being discussed, with differing interpretations of the initial question regarding hydrostatic pressure versus head loss. The discussion remains unresolved.

Contextual Notes

Participants have not fully defined the hydraulic system or clarified the assumptions underlying their experimental data, which may affect the interpretation of results.

lifeisstrange444
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TL;DR
Request
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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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
 
Last edited by a moderator:
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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