Volume flow rate variation of a free air jet

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SUMMARY

The discussion focuses on an experiment measuring the velocity distribution of air from a round nozzle with a diameter of 30mm. The results indicated that the volume flow rate increased linearly at distances of 2D, 6D, and 10D along the centerline, contradicting the assumption of constant flow rate based on the conservation of momentum. This phenomenon can be attributed to the effects of jet expansion and entrainment in free air jets.

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  • Understanding of fluid dynamics principles, specifically jet flow.
  • Knowledge of conservation of momentum in fluid mechanics.
  • Familiarity with experimental setup for measuring flow rates.
  • Basic concepts of velocity distribution in fluid jets.
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  • Research the principles of jet expansion in fluid dynamics.
  • Learn about the effects of entrainment on volume flow rates in free jets.
  • Explore experimental methods for measuring velocity distribution in fluid flows.
  • Study the conservation of mass and momentum in fluid mechanics.
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Students and researchers in fluid dynamics, engineers involved in nozzle design, and anyone studying the behavior of air jets in various applications.

sillyfresher
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Hi,

I recently did an experiment whereby we investigated the velocity distribution of air expelled from a round nozzle whose diameter, D, was 30mm.

We have been asked to calculate the volume flow rate at distances of 2D, 6D and 10D along the centreline. We found the flow rates to INCREASE linearly as you moved DOWNSTREAM.

We assumed the volume flow rate would be constant due to the conservation of momentum.

Please could you explain why we found this relationship?

Thanks
 
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Please describe your experimental set up in more detail .
 

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