HW6
1- What diameter orifice hole, d, is needed if under ideal conditions the flow-rate
through the orifice meter as shown is to be 30 gal/min of sea water with P1 – P2
= 2.37 lb/in3? The contraction coefficient is assumed to be 0.63.
2- A 2-in.-diameter orifice plate is inserted in a 3-in.-diameter pipe. If the water
flow-rate through the pipe is 0.90 cfs, determine the pressure difference indicated
by a manometer attached to the flow meter.
3- A 50-mm-diameter nozzle is installed at the end of a 80-mm-diameter pipe
through which air flows. A manometer attached to the static pressure tap just
upstream from the nozzle indicates a pressure of 7.3 mm of water. Determine the
flow-rate.
4- A 2.5-in.-diameter nozzle meter is installed in a 3.8-in.-diameter pipe that carries
water at 160o F. If the inverted air-water U-tube manometer used to measure the
pressure difference across the meter indicates a reading of 3.1 ft, determine the
flow-rate.
5- Water flows through the orifice meter shown in the figure at a rate of 0.10 cfs. If d
= 0.1 ft. determine the value of h.
6- Water flows over a 5-ft-wide, rectangular sharp-crested weir that is Pw = 4.5 ft
tall. If the depth upstream is 5 ft, determine the flow-rate.
7- Water flows over a broad-crested weir that has a width of 4 m and a height of Pw
= 1.5 m. The free-surface well upstream of the weir is at a height of 0.5 m above
the surface of the weir. Determine the flow-rate in the channel and the minimum
depth of the water above the weir block.