Fluid Mechanics: Fundamentals and Applications
4th Edition
ISBN: 9781259696534
Author: Yunus A. Cengel Dr., John M. Cimbala
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 5, Problem 126P
Which one is not an assumption involved with the Bernoulli equation?
(a) No elevation change
(b) Incompressible flow
(c) Steady flow
(d) No shaft work
(e) No friction
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Students have asked these similar questions
(a) Water flows by gravity from one lake to another as illus-
trated; the surface levels of the lakes differ by an eleva-
tion of h= 50 ft. If the volumetric flow rate is steady at
Q = 80 gallons per minute, what is the associated loss
of available energy?
(b) A pump is to be installed to pump the water from the
lower lake to the upper lake with the same flow rate
as above (Q = 80 gpm). If the amount of energy loss
is assumed to be the same as in part (a), how much
mechanical power must be supplied by the pump?
Answer: (a) loss = 1600 ft-lb/slug, (b) Wpump = 2.0
hp
In a detergent making process, 25 m3/h of water flows through a 5 cm diameter pipe system asfollows:Point 1, the suction side of the pump, is at a pressure of 175 kPa. After exiting from the pump,the water runs through a 2 m horizontal length of pipe, a fully-open gate valve, another 2 mhorizontal run, a 90º bend, 0.5 m vertical rise, 90º bend, 4 m horizontal run, 90º bend, 1.5 m verticalrise, 90º bend, 2 m horizontal run, half-open globe valve, 6 m horizontal run, 90º bend, 4 m verticalrise, 90º bend, 4.5 m horizontal run, 90º bend, 4 m vertical rise, 90º bend, 9 m horizontal run, fully-open gate valve, 1 m horizontal run then, finally, entry into a tank containing 10 m of liquid. Point2 is the liquid surface in the tank, which is open to atmosphere.
(a) If the center-line of the pump and the bottom of the tank are both at grade level, estimate thehead that the pump must deliver. Take the density and viscosity of water as 1000 kg/m3 and 10-3Pa·s, respectively. (b) What is the pump…
Q2(a) Express your understanding of Bernoulli Equation and give two engineering application
examples on this principle ?
A fire rescue team is fight fires at the on-fired yacht as in Figure Q2(b) by draining
seawater with a density of 1030 kg/m³ through a 20-cm-diameter pipe at a rate of 0.1
m³/s and discharging it through a hose nozzle with an exit diameter of 5 cm. The total
irreversible head loss of the system is 3 m, and the position of the nozzle is 4 m above
sea level. Neglect the head loss for turbine. For a pump efficiency of 70 %, determine :
(b)
(i)
the required shaft power input to the pump.
(ii)
the water discharge velocity.
4 m
RE RESCUE
Figure Q2(b)
Chapter 5 Solutions
Fluid Mechanics: Fundamentals and Applications
Ch. 5 - Does the amount of mass entering a control volume...Ch. 5 - Define mass and volume flow rates. How are they...Ch. 5 - Name four physical quantities that are conserved...Ch. 5 - When is the flow through a control volume steady?Ch. 5 - Consider a device with one inlet and one outlet....Ch. 5 - A hair dryer is basically a duct of constant...Ch. 5 - A garden hose attached with a nozzle is used to...Ch. 5 - Air whose density is 0.082 Ibm/ft3 enters the duct...Ch. 5 - A 0.7$-m3 rigid tank initially contains air whose...Ch. 5 - Consider the flow of an incompressible Newtonian...
Ch. 5 - A desktop computer is to be cooled by a fan whose...Ch. 5 - The minimum fresh air requirement of a residential...Ch. 5 - The ventilating fan of the bathroom of a building...Ch. 5 - Air enters a nozzle steadily at 2.21 kg/m3 and 20...Ch. 5 - Air at 40°C flow steadily through the pipe shown...Ch. 5 - In climates with low night-time temperatures, an...Ch. 5 - What is mechanical energy? How does it differ from...Ch. 5 - Define turbine efficiency, generator efficiency,...Ch. 5 - What is mechanical efficiency? What does a...Ch. 5 - How is the combined pump-motor efficiency of a...Ch. 5 - Prob. 21PCh. 5 - A differential thermocouple with sensors at the...Ch. 5 - Electric power is to be generated by installing a...Ch. 5 - Consider a river flowing toward a lake at an...Ch. 5 - Express the Bernoulli equation in three different...Ch. 5 - What are the three major assumptions used in the...Ch. 5 - Define static, dynamic, and hydrostatic pressure....Ch. 5 - What is streamwise acceleration? 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