Pressure drop across an array of different nozzles?

AI Thread Summary
Calculating the pressure drop across an array of nozzles in a large flow meter involves understanding the flow dynamics as air passes through various nozzle sizes. The user has the initial air velocity of 5 m/s and the dimensions of the tunnel and nozzles but is uncertain about how to approach the calculation for parallel nozzles. Using Bernoulli's equation with the total combined exit diameter of the nozzles may not yield accurate results due to the complexities of parallel flow. Insights from HVAC professionals regarding similar scenarios in duct systems could provide valuable guidance. Accurate pressure drop calculations are crucial for optimizing airflow in such setups.
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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