University of Ontario Institute of Technology
Faculty of Engineering and Applied Science
MECE3930U: Heat Transfer
Winter 2015
Assignment 1
Submission Deadline: Jan 19, 2015 at 5:00 PM
1. Steady-state, one-dimensional conduction occurs in a rod of variable

Section 3.1 review
T ( x ) = Ts ,1 +
Temperature distribution:
Ts , 2 Ts ,1
x
Heat Flux and Heat Rate:
Heat flux ( q ) is independent of x.
x
Thermal Resistances
(
(3.5)
)
(3.4)
T
Rt =
and Thermal Circuits:
q
Conduction in a plane wall:
Convection:
dT

Extended Surfaces
Chapter Three
Section 3.6
Nature and Rationale
Nature and Rationale of Extended Surfaces
An extended surface (also know as a combined conduction-convection system
or a fin) is a solid within which heat transfer by conduction is assumed

Extended Surfaces
Chapter Three
Section 3.6
Performance Parameters
Fin Performance Parameters
Fin Effectiveness
Fin Efficiency
Performance Parameters
Fin Performance Parameters
Fin Resistance:
Rt , f
b
qf
=
1
hA f f
(3.97)
Design Parameters
Fin Design

Problem: Chip Heat Sink
Problem 3.144: Determination of maximum allowable power qc for a 20 mm
20 mm electronic chip whose temperature is not to exceed
Tc = 85 C, when the chip is attached to an air-cooled heat sink
with N = 11 fins of prescribed dimensi

Review of Transient Conduction, Lumped Capacitance Method
A heat transfer process for which the temperature varies with time, as well
as location within a solid.
It is initiated whenever a system experiences a change in operating conditions.
Based on t

Introduction to Convection:
Flow and Thermal Considerations
Chapter Six
Sections 6.1 through 6.3
and parts of Sections 6.5 and 6.6
Boundary Layer Features
Boundary Layers: Physical Features
Velocity Boundary Layer
A consequence of viscous effects
associ

Review of Chapter 5 so far!
Transient Heat Conduction:
The temperature distribution is a function of x and t : T=T(x,t)
Bi =
hLc
k
Bi 0.1
Bi 0.1
T T (t )
T = T ( x, t )
The temperature distribution T(t) already derived
and available for these cases:
The t

Chapter 6 review: Physical Features
Chapter 6 review: Physical Features
As with all external flows, the boundary layers develop freely without constraint.
Boundary layer conditions may be entirely laminar, laminar and turbulent,
or entirely turbulent.

Internal Flow:
General Considerations
Chapter 8
Sections 8.1 through 8.3
Entrance Conditions
External flow vs Internal flow
No constraints on the flow boundary layer
Fluid is confined by a surface
Must distinguish between entrance and fully developed r

Mean Temperature (cont.)
Special Case: Uniform Surface Temperature
dTm qs P
P
=
=
h (Ts Tm )
dx m c
p m cp
(2)
Mean Temperature (cont.)
x
Total heat rate:
qconv = h As Tm Tm =
To Ti
1n ( To / Ti )
( 3)
To Ts Tm ,o
h As
PL
=
= exp
h = exp
mc
mc
Ti

Free Convection
Chapter 9
Sections 9.1 through 9.9
General Considerations
General Considerations
Free convection refers to fluid motion induced by buoyancy forces.
Buoyancy forces may arise in a fluid for which there are density gradients
and a body for

College of Engineering and Computer Science
Mechanical Engineering Department
Mechanical Engineering 370
Thermodynamics
Fall 2010 Course Number: 14319
Instructor: Larry Caretto
,mn,kn
Unit Eight Homework Solutions, November 2, 2010
1
Then.kn.kn.kmn.lm/.lj

Section 3.1 review
Temperature Distribution:
T ( x ) = Ts ,1 +
Ts , 2 Ts ,1
x
Heat Flux and Heat Rate:
Heat flux ( q ) is independent of x.
x
Heat rate ( qx ) is independent of x.
dT k
= ( Ts,1 Ts ,2 )
dx L
dT kA
qx = kA
=
(Ts,1 Ts,2 )
dx
L
q = k
x
T
The

Chapter Two review
Fouriers Law
q = k T
Cartesian Coordinates:
T
(x, y, z )
T
T
T
i k
jk
k
x
y
z
q
q
q
x
z
y
q = k
(2.3)
Cylindrical Coordinates: T ( r , , z )
q = k
T
T
T
i k
jk
k
r
z
r
qr
q
z
q
T (r , ,
(2.24)
)
Spherical Coordinates:
T
T

Chapter One review
CONSERVATION OF ENERGY
Conservation of Energy
in E out + E g = dEst E st
E
dt
(1.12c)
Each term has units of J/s or W.
Over a Time Interval
Ein Eout + Eg = Est
(1.12b)
Each term has units of J.
THE SURFACE ENERGY BALANCE
A special ca

University of Ontario Institute of Technology
Faculty of Engineering and Applied Science
MECE3930U: Heat Transfer
Winter 2015
Assignment 1 Solution
Problem 2.
Problem 3.
Problem 4.

University of Ontario Institute of Technology
Faculty of Engineering and Applied Science
MECE3930U: Heat Transfer
Winter 2015
Assignment 2 Solution
1.
2.
3.
4.

University of Ontario Institute of Technology
Faculty of Engineering and Applied Science
MECE3930U: Heat Transfer
Winter 2015
Assignment 2
Extended Submission Deadline: Feb 4 at 5:00 PM
1. A cylindrical alloy (ka=15 W/m.k) container (rin=40 cm and ro=50cm

University of Ontario Institute of Technology
Faculty of Engineering and Applied Science
MECE3930U: Heat Transfer
Winter 2015
Assignment 3
Extended Submission Deadline: Feb 13 at 5:00 PM
1. A cylindrical alloy (ka=15 W/m.k) container (rin=40 cm and ro=50c

University of Ontario Institute of Technology
Faculty of Engineering and Applied Science
MECE3930U: Heat Transfer
Winter 2015
Assignment 4
Extended Submission Deadline: Mar 3 at 5:00 PM
1. Air flows with a velocity of 20 m/s over a flat plate of length 2m

University of Ontario Institute of Technology
Faculty of Engineering and Applied Science
MECE3930U: Heat Transfer
Winter 2015
Assignment 5
Submission Deadline: Mar 27 at 5:00 PM
1. A hot 2-cm metal ball of temperature Ts=754C is placed into a pool of satu

Heat Transfer Laboratory
MECE 3930 U
Lab # 4
Group # 18
Shell and Tube Heat Exchanger
Course Instructor: Sima Kouhi Fayegh
Lab Instructor: Abdullah AlZahrani
Surname
Name
Student Number
Al Haddad Mahdi
100462905
Fracz Melissa
100487042
Hong Kyong-Duk
1004

University of Ontario Institute of Technology
Faculty of Engineering and Applied Science
MECE3930U: Heat Transfer
Winter 2015
Project Submission Deadline: Mar 31 at 5:00 PM
What is wind chill effect?
Wind chill effect is the temperature felt by our body w

MECE 3930U - Heat Transfer (Winter 2014)
Midterm Test
Date: February 27, 2014
Name:
Student ID #:
Notes:
This test paper contains 5 short answer/multiple choice questions and 2 problems.
Solve all questions directly on the test paper (circle the correct m

College of Engineering and Computer Science
Mechanical Engineering Department
Mechanical Engineering 370
Thermodynamics
Fall 2010 Course Number: 14319
Instructor: Larry Caretto
,mn,kn
Unit Eight Homework Solutions, November 2, 2010
1
The radiator of a ste