CE3502 lab 3

CE3502 lab 3 - Applications of the Bernoulli equation...

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Applications of the Bernoulli equation Laboratory section: 004 Name: Fahad Al Jaberi TA: Feng Wan Date of experiment: 10/01/08 (I did this work myself) Purpose: This experiment deals with applying Bernoulli’s equation and measure the discharge on several flows by measuring the difference in pressure and by using the method of continuity to know the velocities of the flow and therefore know the discharge. A comparison must be made to know the difference between the calculated and the experimentally obtained values. However, Bernoulli’s equation is used only for steady, incompressible, inviscid flow along the streamline. Apparatus and procedure: Venturi Meter: o Using pipe 2, we set three different speeds (60, 80, 100 volts) o For each voltage, we measure h from the large manometer where p=γ w h. o We calculate Q ideal using Bernoulli and continuity equations. o We measure h mean from the stagnation tubes by calculate the height at r=0.75inch and take the difference with the static and then calculate the mean velocity. o Calculate the volumetric flow rate Q real using the mean velocity Q real =A 1 V 1(mean) . o Calculate the discharge correction coefficient C v = o Calculate the Reynolds number for the flow at the throat Re= o We also read Q real from the Hasting electronic meter Q=Q Hasting *K(m 3 /min)
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o Calculate C v for the Hasting meter C v =Q real,Hasting /Q ideal o Plot the results in page 22 in the lab manual Orifice Meter: o Using pipe 3, we set three different speeds (60, 80, 100 volts) o For each, we measure h, p= γ w h. o Calculate Q ideal using the equation given on the lab manual, where C c =0.6+0.4(A 2 /A 1 ) 2 o Q real from the Hastings Mass Flow Meter. Q=Q Hastings *K(m 3 /min) and K is given. o Calculate the discharge correction coefficient C v =Q real /Q ideal o Calculate Reynolds number o Plot C vs. Re on page 23 on the lab manual Sluice Gate: o Measure y 1 and y 2 o Calculate q ideal (flow per unit width) using Bernoulli and continuity equation o Measure h to calculate the mean velocity V mean =(2g h)^(1/2) o Calculate C v =q real /q ideal Tabulation of computed results: Venturi part 1 60V 80V 100V ∆p 1517.45 pa 2467.08 pa 3455.87 pa Q ideal 0.026336(m 3 /s) 0.033579(m 3 /s) 0.039742(m 3 /s) Mean velocity 50.2303(m/s) 64.0472(m/s) 75.8031(m/s) Q real 0.025467 (m 3 /s) 0.032472(m 3 /s) 0.038432(m 3 /s) C V 0.966994 0.967031 0.967042 Re 87376.3 111407 131856 Venturi Part 2 60V 80V 100V Q real 0.025275(m 3 /s) 0.031678(m 3 /s) 0.037913(m 3 /s) C V 0.959713 0.943387 0.953966 Re 87376.3 111407
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CE3502 lab 3 - Applications of the Bernoulli equation...

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