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Is there any reason for why a V-notch weir equation for flow rate will give much...

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Mechanical Engineering

Is there any reason for why a V-notch weir equation for flowrate will give much different values than the measured flow ratevalues in an experiment? The professor says this is intentional,and to find the reason why this is.

This is the V-notch equation mentioned:

Q=(8/15)(Cd)sqrt(2g)tan(theta/2) * H^2.5

The weir used had an angle of 60 degrees and the givendischarge coefficient was 0.5767.

It should also be mentioned that using a power regressionmethod on the measured values gave an accurate value for theexponent but a coefficient value nearly twice the coefficient valueof the one in the V-notch equation.

Answer & Explanation Solved by verified expert
4.2 Ratings (744 Votes)
The discharge over a triangular notch or weir is proportional toH52 where H is the height of liquid surface above thesill of the notch or weir As such the accurate measurement of headH is quite essential in order to obtain an accurate value of thedischarge over the notch or weir    See Answer
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