4. Cross ﬂow over a tube bank, with additional details on the energy balance analysis
ln|emal How cl lluld
myougn me
g ’9 h V, Tm> j:{+ + +} V, T
{+H+H+}
% Row 1 Row 2 Row 3
(a) (b)
Figure 2: Cros
JD, §+Cﬂd14 ﬁnk
Sutéiat‘esj _( thwL-Hon ’mnv-edfion ﬂ Siﬁji‘Q'M .
ﬂ 7 _. _ 7
r1,
3 w _- x" w
Ta eh Lahu 5 u”; “be I w 4"“ka F£—-—éj S tarot?» C0.—
, _j‘v‘€6\ 7 _ _ g I _ 7 ﬂ L J
anemia. Mm
Heat Equation
The Differential Equation for Conduction MEEG 342; lecture 3
A differential equation whose solution provides the temperature distribution in a
stationary medium.
Based on applying cons
MEEG 342; lecture 2
Example for Convection
!W $
q' # 2 & = h Ts T
"m %
(
)
Table from"Heat and Mass Transfer:
A Practical Approach, 3/e" By Yunus
A. engel
" W %
" W %
h = $ 2 ' or $ 2 '
# m C &
#m K &
Spring 2016 MEEG 342: Heat Transfer
Course Information
Instructor: Dr. Lian-Ping Wang, [email protected]
Office hours Wednesdays 2:30PM to 4:30PM
Lectures MW 1:25PM-2:15PM, Kirkbride 006
Discussions and
Any ques)on with the computer project?
System-level energy-balance analysis
An example, heat transfer through a tube bank
System level energy-balance analysis of inter
A fully-solved case-study problem:
Finite-difference solution of 1D transient conduction
with heat generation
A computer project, due April 13, 2016
Transient conduction in 2D
Analy&cal solu&on in
The midterm exam I notes
Summary notes on conduction
Comparing transient heat conduction in three geometries
An application example: water main install location
Exam I notes
Wednesday, March 16
SMITH
MEEG 342; discussion 4
Q&A notes
One problem only
1
MEEG 342; discussion 4
Assumptions:
(1) 1D approximation
(2) Steady-state
2
x = L
The concept of thermal
resistance cannot be used
for the wall, why
MEEG 342; discussion 3
Questions: where to find conductivity of various materials?
A.1 Thermophysical Properties of Selected Metallic Solids
A.2 Thermophysical Properties of Selected Nonmetallic Solid
Sakai course website
Any question with HW2?
Any question with my lectures with week?
Three problems
A quiz
Problem 1
MEEG 342; discussion 2
overall
2
Problem 1
MEEG 342; discussion 2
Solutions
q' =
T
a Mime. ‘ Wham L Lemcihvi‘mj'
, ﬂ? X=L yizL
.—il
- .7 ._ =L
m .7 .l’g.‘ no Lug-cit ewiah
w— *1 at gap '
oi: QLQWLmLeJ [Wu ham W airframe.)
04 I: “we ’9 {Hq‘ﬂ Shiite aoLﬁP—VUX men‘s-(-
23de am " T‘ a
2. Correlations of convection heat transfer for flows over a flat plate
For a laminar flow, the boundary layer equations can be solved analytically by first introducing
a similarity variable then perf
MEEG342 Homework Set #9. Heat exchanger analysis
Due Monday, 25 April 2016
P1. Many industrial processes require the rapid cooldown for gases. One method of doing so is
by the use of heat exchangers.
One-Dimensional, Steady-State
Conduction with
Thermal Energy Generation
Chapter Three
Section 3.5, Appendix C
Implications
MEEG 342; lecture 5
Implications of Energy Generation
Involves a local (volu
Energy Balance
Overall Energy Balance
Application to the hot (h) and cold (c) fluids:
Assume negligible heat transfer between the exchanger and its surroundings
and negligible potential and kinet
The midterm exam II notes
Summary notes on convection
Two example problems
Exam II
April 20, 1:20 pm to 2:25 pm, Smith 130
(15 more minutes than the usual class)
Closed book and notes
All correlations
Natural Convection:
General Considerations
and Results for
Vertical and Horizontal Plates
Chapter 9
Sections 9.1 through 9.6.2, 9.9
General Considerations
General Considerations
Free convection refer
Lecture no:8
Transient Conduction:
Spatial Effects and the Role of
Analytical Solutions
Chapter 5
Sections 5.4 to 5.8
!
Solution to the Heat Equation for a Plane Wall with
Symmetrical Convection
Transient Conduction
1
Chapter 5: Transient Conduction
A heat transfer process for which the temperature varies
with time, as well as location within a solid.
T
k
x x
T
T T
+
k
+
k
+
q
=
c
p
t
y
Extended Surfaces
Chapter Three
Section 3.6
MEEG 342; lecture 6
Fins Enhance Heat Transfer From a Surface By
Enhancing Surface Area
2
"Heat and Mass Transfer: A Practical Approach, 3/e" By Yunus A. en
Heat Exchangers:
Chapter 11
Sec3ons 11.1 through 11.3
Types
Heat Exchanger Types
Heat exchangers are ubiquitous to energy conversion and utilization. They involve
heat exchange between
and
8.3
The
(4k/ro) 2ro
NuD hD
8
k
k
5. Internal flow in a circular pipe
A typical example of internal flow is heat transfer (qs00 ) from the hot pipe wall of temperature
Ts to a fluid inside a pipe