Venturi, Orifice and Nozzle

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SUMMARY

The discussion centers on the systematic uncertainty estimation of mass flow through venturi nozzles and orifices, highlighting that the coefficient of velocity (cd) for venturi nozzles is significantly larger than that of orifices. This discrepancy leads to greater errors in measurements when using venturi nozzles. Participants emphasize the importance of clearly defining the test setup and expected results to accurately diagnose issues related to flow measurement. The ASME publication "Fluid Meters" is recommended as a valuable resource for further understanding.

PREREQUISITES
  • Understanding of fluid dynamics principles
  • Familiarity with the concept of discharge coefficient (cd)
  • Knowledge of mass flow measurement techniques
  • Experience with uncertainty analysis in fluid systems
NEXT STEPS
  • Research the ASME publication "Fluid Meters" for comprehensive insights on flow measurement
  • Study the differences in discharge coefficients for various flow devices
  • Learn about systematic uncertainty estimation methods in fluid dynamics
  • Explore the impact of test setup variations on flow measurement accuracy
USEFUL FOR

Engineers, fluid dynamics researchers, and professionals involved in flow measurement and analysis will benefit from this discussion, particularly those focusing on venturi nozzles and orifices.

Merttt
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Hello everyone. When I try to do mass flow systematic uncertainty estimation for venturi nozzle and orifice, I am getting the biggest error from venturi nozzle. What is the reason for it? ( Why coefficient of velocity of venturi nozzle is too big compared to orifice and nozzle.)
 
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Merttt said:
Why coefficient of velocity of venturi nozzle is too big compared to orifice and nozzle.

i am unfamiliar with "coefficient of velocity".
Did you mean perhaps "discharge coefficient " cd ?
see http://www.engineeringtoolbox.com/orifice-nozzle-venturi-d_590.html
cd IS larger for a venturi than for an orifice.

What do you mean by error ?
A question well stated is half answered.
Without knowing your test setup, the results you expected and those you got,
how could anyone do anything but serve you up a word salad??

ASME publishes a most excellent reference , titled simply "Fluid Meters"
 

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