Volume flow rate variation of a free air jet

AI Thread Summary
The experiment focused on measuring the velocity distribution of air from a 30mm round nozzle. It was observed that the volume flow rate increased linearly at distances of 2D, 6D, and 10D along the centerline. This finding contradicts the expectation of a constant flow rate based on the conservation of momentum. The discussion seeks clarification on the reasons behind the observed linear increase in flow rates. Further details about the experimental setup are requested for a better understanding of the results.
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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