Nova Scotia Agricultural College (Affiliated with the Dalhousie University)
ENGI 2102

Fall 2015
ENGI 2102: ThermoFluid Engineering I
Fall 2015
Assignment 2
Due: Thursday, October 1st, 2015 by 2 pm
Bring your assignment to the lecture or lab F106 between 1 and 2 pm
Problem 1
[4 marks]
Wire is to be coated by drawing it through a circular die of 1 mm
Nova Scotia Agricultural College (Affiliated with the Dalhousie University)
ENGI 2102

Fall 2015
ENGI 2102: ThermoFluid Engineering I
Fall 2015
Assignment 3
Due: Thursday, October 8th, 2015 by 2 pm
Bring your assignment to the lecture or lab F106 between 1 and 2 pm
Problem 1
[4 marks]
Two tanks are connected by a manometer. The first tank is closed
Nova Scotia Agricultural College (Affiliated with the Dalhousie University)
ENGI 2102

Fall 2015
ENGI 2102: ThermoFluid Engineering I
Fall 2015
Assignment 6 SOLUTIONS
Problem 1
[10 marks]
a)
P
3
W31
Q23
Q12
T2 = 303.15 K
2
W12
P1 = 100 kPa
1 T1 = 373.15 K
v
b) From Table B.1 for air, R = 0.2871 kJ kg1 K1
cv = cp R = 1.007 0.2871 = 0.7199 kJ kg1 K1
P
Nova Scotia Agricultural College (Affiliated with the Dalhousie University)
ENGI 2102

Fall 2015
ENGI 2102: ThermoFluid Engineering I
Fall 2015
Assignment 5 SOLUTIONS
Problem 1
[4 marks]
T1 = 30C = 303.15 K
From Table B.1 for air, R = 0.2871 kJ kg1 K1 = 0.2871 kPam3 kg1 K1
a) Assuming that the air behaves as an ideal gas,
PV = mRT
Because the amount
Nova Scotia Agricultural College (Affiliated with the Dalhousie University)
ENGI ENGI 2102

Fall 2015
ENGI 2102: ThermoFluid Engineering I
Fall 2015
Assignment 7 SOLUTIONS
Problem 1
[4 marks]
[Chapter 5, Problem 5]
a) This is a constant volume heating process. Therefore the Pv diagram is,
P
2
1
v
b) For a constant volume process V = 0, therefore,
W = 0 k
Nova Scotia Agricultural College (Affiliated with the Dalhousie University)
ENGI 2102

Fall 2015
ENGI 2102: ThermoFluid Engineering I
Fall 2015
Assignment 4 SOLUTIONS
Problem 1
[3 marks]
dW Fdx
x2
k n 1
W kx n dx
x
n 1
x1
k
n
W
x 2 1 x1n 1
n 1
Problem 2
[3 marks]
The kinetic energy of the car is,
2
KE
2
1
1
miles 5280 ft h
mu 2 5500 lb m 55
Nova Scotia Agricultural College (Affiliated with the Dalhousie University)
ENGI 2102

Fall 2015
ENGI 2102: ThermoFluid Engineering I
Fall 2015
Assignment 1
Due: Thursday, September 24th, 2015 by 2 pm
Bring your assignment to the lecture or lab F106 between 1 and 2 pm
Problem 1
[7 marks]
a) Convert 20C into F.
b) The atmospheric pressure at the top
Nova Scotia Agricultural College (Affiliated with the Dalhousie University)
ENGI 2102

Fall 2015
ENGI 2102: ThermoFluid Engineering I
Fall 2015
Assignment 3 SOLUTIONS
Problem 1
[4 marks]
P2
Air
P1
x
Oil
y
Water
z
Mercury
Starting at the pressure above the oil and noting that P2 = Patm = 101325 Pa,
P2 O g x y Hg gz W g y z P1
900 kg 9.81 N
P1 10132
Nova Scotia Agricultural College (Affiliated with the Dalhousie University)
ENGI 2102

Fall 2015
ENGI 2102: ThermoFluid Engineering I
Fall 2015
Assignment 2 SOLUTIONS
Problem 1
[4 marks]
die
coating
Di = 0.75 mm
wire
F=?
u = 20 m/s
Do = 1 mm
L = 50 mm
F A
F
0 uwire
u
du
Di L
2Di L wire
Do Di / 2
dr
Do Di
2 0.75 mm 50 mm 25 cP 20 m/s Pa s
m
1 0.75m