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  3. (i) explain the physical meaning of reynolds numbe

(i) Explain the physical meaning of Reynolds number and Froude number. (ii) A weir is an obstruction...

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Civil Engineering

(i) Explain the physical meaning of Reynolds number and Froudenumber.

(ii) A weir is an obstruction in a channel flow which can becalibrated to measure the flow rate. The flow discharge Q varieswith gravity acceleration g, weir width b into the paper, andupstream water height H above the weir crest. If it is known that Qis proportional to b, use the pi theorem to find a uniquefunctional relationship Q(g, b, H).

(iii) A dam spillway is to be tested by using Froude scalingwith a 1:30 scale model. The model flow has an average velocity of0.6 m/s and a volume flow rate of 0.05 m3 /s. What will thevelocity and flow of the prototype be? If the measured force on acertain part of the model is 1.5 N, what will the correspondingforce on the prototype be?

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