*biosystems engineering - food science
a newtonian fluid is flowing in a pipeline at a mean velocity of 5 m/s, and this flow rate results in a reynolds number of 17750.
a. what is the maximum velocity in the pipe?
b. if the internal diameter of the pipe is 4.75 cm, when fluid enters the pipe, what is the entrance length required to establish stable flow?

Water is siphoned from a large tank and discharges into the atmosphere through a 50-mm diameter tube. the end of the tube is b = 2.1 m below the tank bottom which is a = 7.4 m deep, and viscous effects are negligible. determine the maximum height h over which the water can be siphoned without cavitation occurring. atmospheric pressure is 101.4 kpa, and the water vapor pressure is 1.79 kpa (absolute)