Leakage rate between two pipes & gasses

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    Leakage Pipes Rate
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SUMMARY

This discussion focuses on modeling methane leakage in a marine piping system, specifically between an inner pipe carrying methane and an outer pipe carrying air. The inner pipe maintains a constant pressure and flow, while the outer pipe operates under countercurrent conditions. The user seeks to estimate methane leakage through a hole in the inner pipe, questioning whether a Bernoulli model suffices or if Computational Fluid Dynamics (CFD) is necessary. The comparison to a linked 3D vessel leakage model highlights differences in pressure conditions, emphasizing the need for accurate modeling techniques.

PREREQUISITES
  • Understanding of Bernoulli's principle and its applications in fluid dynamics.
  • Familiarity with Computational Fluid Dynamics (CFD) tools and methodologies.
  • Knowledge of gas flow dynamics, particularly in piping systems.
  • Experience with pressure and flow measurement in gas systems.
NEXT STEPS
  • Research the application of Bernoulli's theorem in gas leakage scenarios.
  • Explore CFD software options for modeling gas flow, such as ANSYS Fluent or OpenFOAM.
  • Study the effects of pressure differentials in piping systems and their impact on leakage rates.
  • Investigate case studies on methane leakage modeling in marine environments.
USEFUL FOR

Marine engineers, fluid dynamics specialists, and safety analysts involved in methane piping systems and leakage estimation will benefit from this discussion.

Giuliano69
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Hi, I'm facing the problem to model a methane leakage in a methane piping.
I read the 3d on a vessel leakage
https://www.physicsforums.com/showthread.php?t=92511
but the starting condition and model seems different

A marine methane piping, usually present an inner and outer pipe.
In the inner pipe, methane flows at known pressure and flow. The pressure is assumed constant (kept constant by the ship automation)

In the outer pipe, air flows, at known pressure and flow (contercurrent and underpressure)

I need to estimate the methane leakage that a hole in the inner pipe can produce.

Can be solved with a Bernoulli model, or it needs a CFD ?


Does the 3d linked above apply to our model ?
It seems that in the present situation pressure is constant, instead the model linked consider a pressure decrease in the vessel...
 
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the problem could be represented as two gas moving in opposite direction, with constant pressure and flow,
separated by a diaphragm with an hole

p1, v1, f1 --->
--------------------- -------------------
<--- p2, v2, f2


could a simple Bernoulli theorem give an estimation of the leakage ?
 

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