An experiment has been carried out in order to investigate pipe losses caused by three different
bends, a sudden enlargement, and a sudden contraction. The apparatus used in the experiment is
The experiment was conducted as follows. The pressure drop across each pipe feature was
measured by means of piezometer tappings, located upstream and downstream of the fittings. These
were connected to a multitube manometer, as shown in Figure 1, so that the pressure drop across
each fitting is a differential piezometer reading, given in mm (1-2, 3-4 etc.). Readings were
obtained at various flow rates Q, measured in kg/s.
1. Create a table that shows Q (kg/s), V1, V2 (m/s), (V1
2/2g) (mm), and changehL (mm) for all
five fittings. [20 marks]
2. Plot changehL versus (V1
2/2g) for the mitre, elbow and large bend, on a single graph.
3. Plot changehL versus (V1
2/2g) for the enlargement and contraction, on a single graph.
4. Estimate K for each pipe fitting, by finding the gradient of each line you have plotted.
5. Compare the value of K derived above with the expected value and briefly comment on your
findings (a sentence or two for each will suffice). You should cite any source used that has
informed your answer.
SEE ALSO: Error Rate Measurements: Lab Report