In a laboratory experiment, air at 20°C flows from a large tank through a 2- cm-diameter smooth pipe into a sea-level atmosphere, as in Fig. P6.149. The flow is metered by a long-radius nozzle of 1-cm diameter, using a manometer with Merriam red oil (SG = 0.827). The pipe is 8 m long. The measurements of tank pressure and manometer height are as follows:
ptank, Pa (gage): 60 320 1200 2050 2470 3500 4900
hmano, mm: 6 38 160 295 380 575 820
Use this data to calculate the flow rates Q and Reynolds numbers ReD and make a plot of measured flow rate versus tank pressure. Is the flow laminar or turbulent? Compare the data with theoretical results obtained from the Moody chart, including minor losses. Discuss.