The Hong Kong University of Science and Technology
Process Fluid Mechanics
CENG 2220

Spring 2015
PROBLEM 12.38
12.39
For the fan of both Examples 5.19 and 5.28 discuss what fluid
flow properties you would need to measure to estimate fan efficiency.
This is an openended student activity for which student responses will vary. No Solution is
available.
The Hong Kong University of Science and Technology
Process Fluid Mechanics
CENG 2220

Spring 2015
Process Fluid Mechanics
(Properties of Fluids)
Dr. Francesco Ciucci
Assistant Professor
Chemical and Biomolecular Engineering
Francesco CIUCCI
1
Course Road Map
Properties of Fluids
(Ch 1 & 2)
Fluids At Rest
Pressure and Statics
of Fluids (Ch 3)
Fluids in
The Hong Kong University of Science and Technology
Process Fluid Mechanics
CENG 2220

Spring 2015
Process Fluid Mechanics
(Properties of Fluids)
Dr. Francesco Ciucci
Assistant Professor
Chemical and Biomolecular Engineering
Francesco CIUCCI
1
Course Road Map
Properties of Fluids
(Ch 1 & 2)
Fluids At Rest
Pressure and Statics
of Fluids (Ch 3)
Fluids in
The Hong Kong University of Science and Technology
Process Fluid Mechanics
CENG 2220

Spring 2015
Tutorial 1
157 The drag force exerted on a car by air depends on a dimensionless drag coefficient, the
density of the air, the car velocity, and the frontal area of the car. That is, FD = function (CDrag,
Afront, , V). Based on unit consideration alone,
The Hong Kong University of Science and Technology
Process Fluid Mechanics
CENG 2220

Spring 2015
Process Fluid Mechanics
(The Basics)
Dr. Francesco Ciucci
Assistant Professor
Chemical and Biomolecular Engineering
Francesco CIUCCI
1
Course Road Map
Properties of Fluids
(Ch 1 & 2)
Fluids At Rest
Pressure and Statics
of Fluids (Ch 3)
Fluids in Motion
Ki
The Hong Kong University of Science and Technology
Process Fluid Mechanics
CENG 2220

Spring 2015
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The Hong Kong University of Science and Technology
Process Fluid Mechanics
CENG 2220

Spring 2015
Process Fluid Mechanics
CENG 2220
Homework Set 6 Due on April 13th, 2017 before 6 pm
Drop off during tutorial or in the designated drop box in front of the Mechanical Engineering
general office (room 2568 near Lift 2728)
This homework contains a total of
The Hong Kong University of Science and Technology
Process Fluid Mechanics
CENG 2220

Spring 2015
Process Fluid Mechanics
CENG 2220
Homework Set 4 Due on March 24th, 2017 before 6 pm
Drop off during tutorial or in the designated drop box in front of the Mechanical
Engineering general office (room 2568 near Lift 2728)
Problems from the required textbo
The Hong Kong University of Science and Technology
Process Fluid Mechanics
CENG 2220

Spring 2015
Process Fluid Mechanics
CENG 2220
Homework Set 3 Due on March 17th 2017 before 6 pm
Drop off in the designated drop box in front of the Mechanical Engineering general
office (room 2568 near Lift 2728)
Problems from the required textbook
3.6 page 112
3.9
The Hong Kong University of Science and Technology
Process Fluid Mechanics
CENG 2220

Spring 2015
Process Fluid Mechanics
CENG 2220
Homework Set 5 Due on March 28th, 2017 before 6 pm
Drop off during tutorial or in the designated drop box in front of the Mechanical
Engineering general office (room 2568 near Lift 2728)
There are total of 6 problems.
Pr
The Hong Kong University of Science and Technology
Process Fluid Mechanics
CENG 2220

Spring 2015
PS Answer_Ch13
Quick Check Multiple Choice
1. a
2. d
3. d
4. c
5. b
6. a
Problems and Applications
3. a. The following table shows the marginal product of each hour spent fishing:
Hours
Fish
Fixed Cost
Variable Cost
Total Cost
Marginal Product
0
0
$10
$0
The Hong Kong University of Science and Technology
Process Fluid Mechanics
CENG 2220

Spring 2015
Question 1
Solution
A slender glass tube is inserted into kerosene. The capillary rise of kerosene in the
tube is to be determined.
Assumptions 1 There are no impurities in the kerosene, and no contamination on the
surfaces of the glass tube. 2 The kerose
The Hong Kong University of Science and Technology
Process Fluid Mechanics
CENG 2220

Spring 2015
HW3 Solution
Question 1
Solution
A gas is contained in a vertical cylinder with a heavy piston. The pressure inside the cylinder and the
effect of volume change on pressure are to be determined.
Assumptions
Friction between the piston and the cylinder is
The Hong Kong University of Science and Technology
Process Fluid Mechanics
CENG 2220

Spring 2015
CENG 2220 Homework # 1
Question 1:
An important design consideration in twophase pipe flow of solidliquid mixtures is the terminal
settling velocity, which the flow becomes unstable and eventually the pipe becomes clogged. On
the basis of extended trans
The Hong Kong University of Science and Technology
Process Fluid Mechanics
CENG 2220

Spring 2015
HW4 Solution
399
Solution
An irregularly shaped crown is weighed in air and then in water with a spring scale. It is to be
determined if the crown is made of pure gold.
Assumptions
1 The buoyancy force in air is negligible. 2 The crown is completely subm
The Hong Kong University of Science and Technology
Process Fluid Mechanics
CENG 2220

Spring 2015
Process Fluid Mechanics
(Basics contd)
Dr. Francesco Ciucci
Assistant Professor
Chemical and Biomolecular Engineering
Francesco CIUCCI
1
Course Road Map
Properties of Fluids
(Ch 1 & 2)
Fluids At Rest
Pressure and Statics
of Fluids (Ch 3)
Fluids in Motion
The Hong Kong University of Science and Technology
Process Fluid Mechanics
CENG 2220

Spring 2015
11.69
11.69
11.69
11.69
PROBLEM 11.70
Air
120 m/s
1 atm
100oC
Air
Tmax
p
Q
At the inlet: ci =
kRT =
1.4 287 N m / kg K 373.15K =
N m / kg K =
387.2m / s
Ma i =
Vi
T
120m / s
373.15K
=
= 0.301 = 0.9822 T0i =
= 379.9 K
ci 387.2m / s
T0
0.9822
The mass flow
The Hong Kong University of Science and Technology
Process Fluid Mechanics
CENG 2220

Spring 2015
12.29
12.29
PROBLEM 12.30
Given Prototype fan; D = 20 ft, p in = 14.40 psia, T in = 70oF, = 90 rpm
1/10 scale model, same p in and T in , W shaft = 1.24 hp, Q = 220 cfm, = 1800 rpm
Find Power and flowrate of prototype fan
Solution
The scaling law for powe
The Hong Kong University of Science and Technology
Process Fluid Mechanics
CENG 2220

Spring 2015
PROBLEM 12.24
12.25
Water is pumped between the two tanks described in
Example 12.4 once a day, 365 days a year, with each pumping
period lasting two hours. The water levels in the two tanks remain
essentially constant. Estimate the annual cost of the ele
The Hong Kong University of Science and Technology
Process Fluid Mechanics
CENG 2220

Spring 2015
PROBLEM 12.42
Re
Re
Re
PROBLEM 12.43
12.43 A model fan with wheel diameter 32 in. is tested at a speed of 1750 rpm. The test fluid is
air with density 0.075 lbm/ft3. At its BEP, the fan produces 8000 ft3/min at total pressure rise of
8 in.H 2 O. A geometr
The Hong Kong University of Science and Technology
Process Fluid Mechanics
CENG 2220

Spring 2015
12.34
Draw a sketch of the pump impeller
(front and side views).
The sketch should be similar to Figure P12.52.
12.35
Draw a sketch of the pump impeller
(front and side views).
The sketch should be similar to Ns = 2.0 impeller in Figure 12.18.
PROBLEM 12.
The Hong Kong University of Science and Technology
Process Fluid Mechanics
CENG 2220

Spring 2015
12.64
12.64
12.64
12.65
Obtain photographs/images of a variety of turbocompressor
rotors and categorize them as axialflow or radialflow compressors.
Explain briefly how they are used. Note any unusual features.
Repeat for compressible flow turbines.
Th
The Hong Kong University of Science and Technology
Process Fluid Mechanics
CENG 2220

Spring 2015
Problem 12.58
Water flows through the Pelton wheel turbine shown in Fig. 12.25. For simplicity we assume
that the water is turned 180 by the blade. Show, based on the energy equation (Eq. 5.84), that
the maximum power output occurs when the absolute veloc
The Hong Kong University of Science and Technology
Process Fluid Mechanics
CENG 2220

Spring 2015
PROBLEM 11.72
11.72 Air is stored in a tank where the pressure is 40 psia and the temperature is 500 R. A
convergingdiverging nozzle with an exit tothroat area ratio of 2.5 attaches the tank to a duct
where heat is exchanged with the air. The exit press
The Hong Kong University of Science and Technology
Process Fluid Mechanics
CENG 2220

Spring 2015
PROBLEM 12.68
+
+
=
PROBLEM 12.69
12.69
+
PROBLEM 12.69
PROBLEM 12.70
12.70 The figure below shows a nozzle vane and a rotor blade for an axial flow gas turbine stage.
The blade speed is 800 ft/s. The absolute velocity leaving the stage is identical to t
The Hong Kong University of Science and Technology
Process Fluid Mechanics
CENG 2220

Spring 2015
PROBLEM 12.22
12.22
PROBLEM 12.22
The Reynolds number is,
Re
Re
factor f = 0.02 for the pipe, and all minor losses, except for the valve,
are negligible. The fluid levels in the two tanks can be assumed to
remain constant.
(a) Determine the flowrate with