Name:
Quiz-1
Heat Transfer: 530.334
1. Match the materials with their thermal conductivities by drawing a line between the material and
the appropriate number.
Thermal Conductivity,
Substance k,
[W/(m.K)]
Styrofoam
_
2. Match heat transfer coefci
__*FIW 7
KNOWN: Electric conductor with insulating sleeve buried in a sand-lled trench
FIND: Temperature at the conductor-Sleeve interface for prescribed dissipation rate,
S CHEMATIC:
r Sad,7;and=20 I
k=0.03W/m-K
I I
Name:
Quiz-6
Heat Transfer: 530.334
3/14/2014
1. Use separation of variables to reduce the partial differential equation describing heat diffusion
in cylindrical coordinates, Equation 1, to ordinary differential equations. Do not solve the
resulting eq
Name:
530.334 Heat Transfer
Quiz-8
4/4/2014
1. Derive the expression for the Biot number ( Bi ) from the energy balance at the interface of the
solid and the fluid (5 points) 8 ct CM?WOMS
W:
cm hL (E
33:13: L/m SMT \
a fxz I RUMV
2. Plot the trans
KNOWN: Internal flow with prescribed wall heat flux as a function of distance.
FIND: (a) Beginning with a properly defined differential control volume, the temperature distribution,
Tm(x), (b) Outlet temperature, Tm, (c) Sketch Tm(x), and Ts(x) for fully
Thermal resistances:
an introduction
Heat transfer (or heat) is energy in transit due to a
temperature difference.
Whenever there is a temperature difference (driving
force) in the medium, heat flow must occur as a result
How to describe/model heat tra
Transient Conduction:
The Lumped Capacitance Method
Chapter Five
Sections 5.1 thru 5.3
Transient Conduction
Transient Conduction
A heat transfer process for which the temperature varies with time, as well
as location within a solid.
It is initiated when
Radiation: Processes and
Properties
-Basic Principles and DefinitionsChapter 12
Sections 12.1 through 12.3
General Considerations
General Considerations
Attention is focused on thermal radiation, whose origins are associated
with emission from matter at
The heat diffusion equation
References and illustrations:
F. P. Incropera, D. P. DeWitt, Fundamentals of heat and mass
transfer, John Wiley & Sons, New York, 2002.
Y.A. Cengel, M.A. Boles, Thermodynamics an engineering
approach, 3rd edition, McGraw Hill,
A quick review of thermodynamics
What does thermodynamics tell us?
What does heat transfer tell us?
Thermodynamic system, boundary
and surroundings
Thermodynamic system and
control volume
System: Device or combination of devices containing a quantity of
530.334 HEAT TRANSFER
SPRING 2014
Instructor: Cila Herman
Department of Mechanical Engineering
Latrobe 102
Phone: 410-516 4467
E-mail: cherman@jhu.edu
Topics covered
1. Course logistics, structure, syllabus
2. What is heat transfer?
3. Introduction to hea
Name:
Quiz-7
Heat Transfer: 530.334
3/28/2014
1. Write down the nodal finite difference equation for the following cases. (Ax = Ay)
a) Node at an external corner with convection
Olieecl, re qbeseh : 0 ®
q" 9&3
K
b _
0y»; \KQMIQ Qa,n-'Twln3/u% C2)