Pressure drop through an orifice in a pipe

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SUMMARY

The discussion focuses on calculating pressure loss over an orifice in a pipe using the equation Δp/ΔL = ζρ(v²/2D_h). The user has the friction factor and Reynold's number but is uncertain about selecting the appropriate velocity for accurate pressure drop calculations due to varying orifice thickness. It is established that the initial velocity based on the Reynold's number may not yield the most accurate results. A recommendation is provided to use an online calculator for restriction orifice plate calculations.

PREREQUISITES
  • Understanding of fluid dynamics principles, specifically pressure drop calculations.
  • Familiarity with the concepts of Reynold's number and friction factor.
  • Knowledge of orifice flow characteristics and hydraulic diameter.
  • Experience with Computational Fluid Dynamics (CFD) modeling.
NEXT STEPS
  • Research the impact of orifice thickness on pressure drop calculations.
  • Learn how to accurately determine velocity for varying orifice conditions.
  • Explore advanced CFD validation techniques for orifice flow.
  • Utilize online calculators for restriction orifice plate design and analysis.
USEFUL FOR

Engineers, fluid dynamics researchers, and CFD analysts seeking to validate orifice flow models and optimize pressure drop calculations in piping systems.

Appa
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Hey all,

I'd need help with determining the pressure loss over an orifice in a pipe. I have an equation for the friction factor so no problem there, and I know the Reynold's number as well. What confuses me is choosing the suitable velocity for the pressure drop equation;

\frac{Δp}{ΔL} = ζρ\frac{{v^{2}}}{2D_{h}}

The thickness of the orifice varies so the initial velocity corresponding to the Reynold's number surely won't be the most accurate choise for the pressure drop calculation, will it? (The thickness over hydraulic diameter will vary between 0 and 10).

This is not a homework question! I want to approximate the pressure drop in order to validate a CFD model of the orifice.

Cheers,
A
 
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