Momentum Transfer (Flow of Fluids)

Question 1

The viscosity of a gas

Answer 1

increases with increase in temperature

Question 2

A pump draws 69.1 gal/min of a liquid solution having a density of 114.8 lb/ft3 from an open storage feed tank of large cross sectional area through a 3-inch sch40 suction line. The pump discharges its flow through a 2-inch sch40 line to an open overhead tank. The end of the discharge line is 50 ft above the level of the liquid in the feed tank. The friction losses in the piping system are 10 ft-lbf/lb.

A. What pressure must the pump develop?
B. What is the horsepower of the pump if the efficiency is 65%? The flow is turbulent

Answer 2

A. 48 psi
B. 3 hp

Question 3

Water flowing at 2.27 m3/hr at 320 K is pumped through a 40 mm ID pipe, through a length of 150 m in a horizontal direction, and up through a vertical height of 10 m. In the pipe there is a control valve, equivalent to 200 pipe diameters, and other pipe fittings equivalent to 60 pipe diameters. Also in the line is a heat exchanger across which the head lost is 1.5 m water. Assume that the main pipe has a roughness of 0.2 mm What power must be supplied to the pump if it
is 60 percent efficient?

Answer 3

136 W