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$\begingroup$ But the graph shows there is flow taking place across the fan plane and not just turbulent dissipating the energy. Isn't this considered a 'useful action'? $\endgroup$
– GRANZER
Commented Mar 23 at 20:08
1

$\begingroup$ See my edits. These sorts of graphs come about because someone makes the driven quantity (airflow in this case) equal some number. Somewhere in the experimental setup, there's another fan. $\endgroup$
– TimWescott
Commented Mar 23 at 20:24

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