1.Water at 50 degrees Celsius flows in a 150-mm-diameter pipe with V=6.5 m/s and e=0.14 mm. Head loss measurements indicate that f=0.020. What is the thickness of the viscous sublayer? Is the pipe behaving as a fully rough pipe?
2.In a 1.00-m-diameter pipe velocities are measured as 5.35 m/s on the centerline and 4.91 m/s at r=70 mm. Approximately what is the flow rate?
3.Two pipes, one circular and one square, have the same cross-sectional area. Which has the larger hydraulic radius, and by what percentage?
4.The influent BOD5to a primary settling tank is 345 mg/L.The average flow rate is 0.050 m3/s.If the BOD5 removal efficiency is 30%,How many kg of BOD5 are removed in the primary settling tank each day?