###### A thin-plate orifice has been installed to measure water flow in

a pipe with an inner diameter ( D1) of 0.147m and an orifice

diameter ( D2) of 0.0735m. The orifice pressure taps are located a

distance D1 upstream and D 1/2 downstream of the orifice. Write

a MATLAB ® script to calculate the flow rate, Q, if the measured

pressure drop ( PA PB) is 9000Pa when the water temperature

is 20C. Use the procedure outline by White (2008) as shown.

1. Guess a value for C 0.61.

2. Calculate flow Q ( m3/s ) using the value of C .

3. Calculate velocity in pipe, uA, and the Reynolds number, NRe.

4. Calculate a new value for C using the empirical equation

for the orifice coefficient for D and D /2 taps:

5. Repeat steps (2) through (4) until you converge to constant Q

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