Pressure drop across an array of different nozzles?

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SUMMARY

The discussion centers on calculating the pressure drop across an array of six nozzles in a flow meter within a tunnel. The air velocity before the nozzles is 5 m/s, with a flow meter tunnel diameter of 50 inches and nozzle exit diameters of 6", three 4", 3", and 2". The initial calculation using Bernoulli's equation yielded a pressure drop of 1.22 inH2O, but the user questions the validity of this approach due to the parallel configuration of the nozzles. Accurate pressure drop calculations require considering the individual characteristics of each nozzle rather than simply summing their diameters.

PREREQUISITES
  • Understanding of fluid dynamics principles, particularly Bernoulli's equation.
  • Knowledge of pressure drop calculations in parallel flow systems.
  • Familiarity with nozzle design and flow characteristics.
  • Basic HVAC principles related to airflow in duct systems.
NEXT STEPS
  • Research "pressure drop calculations for parallel nozzles" to understand proper methodologies.
  • Study "Bernoulli's equation applications in complex flow systems" for advanced insights.
  • Explore "nozzle flow characteristics and their impact on pressure drop" for detailed analysis.
  • Investigate "HVAC duct design principles" to relate findings to practical applications in air systems.
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Engineers, HVAC professionals, and fluid dynamics researchers seeking to optimize airflow and pressure drop calculations in complex systems involving multiple nozzles.

tectactoe
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I have a question about calculating the pressure drop in a large flow meter across an array of nozzles. Basically its inside of a tunnel... air flows in this tunnel until it reaches a "gate" which is blocked off except for six nozzles of different size, which discharge back into an open tunnel...

We know the velocity of the air before the nozzle array (5 m/s), the diameter of the flow meter tunnel (50"), as well as the exit diameter of the six nozzles (6", 3 x 4", 3", and 2").

To be honest, I'm not sure what to do when it comes to the parallel pressure drop through different nozzles. I tried Bernoulli's equation using the total combined exit diameter of the nozzles as my exit point... It gave me about 1.22 inH2O. But I feel like this calculation is wrong because you can not just add up the nozzle exit diameters when in parallel.

Any suggestions?
 
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anyone? any insight would be greatly appreciated.
 
The HVAC guys might have something about that for their long furnace duct runs.
 

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