Pressure across an orifice/choke plate

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SUMMARY

The discussion centers on calculating the diameter of an orifice plate to restrict mass flow to 1.5 kg/s of compressed air at a total pressure of 400 psia and a temperature of 300K. It confirms that while static pressure decreases and velocity increases across the orifice, total pressure also drops due to momentum losses associated with flow dynamics. Understanding these principles is essential for effective choke plate design.

PREREQUISITES
  • Fluid dynamics principles, particularly Bernoulli's equation
  • Understanding of orifice plate design and applications
  • Knowledge of choked flow conditions
  • Familiarity with pressure measurement units, specifically psia
NEXT STEPS
  • Research orifice plate sizing calculations using the orifice equation
  • Study the effects of choked flow on mass flow rates
  • Learn about momentum loss factors in fluid flow
  • Explore software tools for simulating fluid dynamics in piping systems
USEFUL FOR

Engineers, particularly those in mechanical and chemical fields, who are involved in fluid flow design and analysis, as well as anyone working with orifice plates and choke systems.

scienc
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Hi,
I've been trying to calculate the diameter for an orifice plate so that when inserted in a pipe it restricts the mass flow to the value I want (1.5 kg/s of compressed air, total pressure= 400 psia, T=300K). So essentially I am trying to design a choke plate. When a flow goes across an orifice plate, does the total pressure drop ? I can understand that the static pressure drops and velocity increases. But I simply can't get why the total pressure has to drop. Does it have something to do with momentum losses ?
Answering this would really help me sort out my confusion.

Thanks
N
 
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