The below times were given in a hydraulic bench experiment, where a pump was used to pump water from a lower tank into a measuring tank. The measuring tank is attached to a lever arm with a mechanical advantage of 1:3. Three tests were conducted, one at 50% opening, one at1 80% and one at 100%. The following times were

The below times were given in a hydraulic bench experiment, where a pump was used to pump water from a lower tank into a measuring tank. The measuring tank is attached to a lever arm with a mechanical advantage of 1:3. Three tests were conducted, one at 50% opening, one at1 80% and one at 100%.

The following times were recorded.

My question is, why do the times go from 50% down to 80% and back up for 100%?

I have been trying to research different reasons but I'm coming up a little bit blank. I was initially following the idea that there is a state of equilibrium between 80% and 100% where the pressure decreases but the velocity is unable to increase. Is this a plausible train of thought? Is there an equilibrium state between 80% and 100% where the pressure is unable to increase due to both tanks being open to atmospheric pressure?

Any help in this would be extremely helpful,

EDIT: What would you like me to be more specific on? I'm asking if anyone knows a potential reason for the flow rate to increase between 50% and 80% then decrease between 80% and 100%? The relationship is not linear, even though, theoretically it would be.

 

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Trial 1 2 3 4 5 6 7 8 9 10 11 12 50% 17.76 20.08 21.91 18.03 21.00 23.02 17.95 22.70 21.01 17.23 18.22 18.71 Flow Times (s) 80% 12.80 12.97 13.06 12.65 12.96 13.86 14.47 15.56 16.26 15.52 15.19 15.61 100% 17.38 20.35 22.14 13.89 14.39 15.00 14.25 15.11 15.82 14.76 15.50 16.03

Expert Answer

There could be multiple reasons why the flow rate increases between 50% and 80% and then decreases b View the full answer