Problem 3.45
Problem 3.45
KNOWN: Thickness and inner surface temperature of calcium
silicate insulation on a steam pipe. Convection and radiation
conditions at outer surface.
FIND: (a) Heat loss per unit pipe length for prescribed insulation
thickness and
Lecture 8
Friday
2/5/2016
Summary of Heat Diffusion Equation
Cartesian Coordinates:
Cylindrical Coordinates:
Spherical Coordinates:
The Plane Wall
The Plane Wall
Consider a plane wall between two fluids of different temperature:
Heat Equation:
d dT
k
d
Lecture 10
Monday
2/14/2016
Extended Surfaces
and Fins
Chapter 3: Section 3.6
Nature and Rationale of Extended Surfaces
In many applications, it is desirable to maximize convection
heat transfer between a surface and a fluid.
qconvection hAsurface Tsurfa
Lecture 7
Wednesday
2/3/2016
Homework Format
The top of each page should be labeled:
Last Name, First Name | ME 3242, Sec 002 | Assignment # | Page #/Total Pages
Staple all pages together in upper left corner.
Boundary and Initial Conditions
For transi
Lecture 6
Monday
2/1/2016
The Heat
Diffusion
Equation
Chapter 2: Section 2.3
The Heat Equation
A differential equation whose solution provides the temperature distribution in a
stationary medium.
Based on applying conservation of energy to a differentia
Lecture 9
Friday
2/12/2016
Problem 3.90
So the temperature distribution from L x L can be expressed as:
T ( x)
q
2 fuel
2
x
qL
fuel
2b
L
2 3
x qL
T
steel h 2 fuel
(b) The temperature distribution will have the following attributes:
From (-L-b)
Lecture 4
Wednesday
1/27/2016
Question (30 s)
Which thermal energy transport mechanism
is associated with electromagnetic waves
and does not require a medium?
A: Conduction
B: Convection
C: Radiation
Question (30 s)
Which thermal energy transport mecha
Lecture 5
Friday
1/28/2016
Fouriers Law and
the Heat Equation
Chapter 2
Fouriers Law
A rate equation that allows determination of the conduction heat flux
from knowledge of the temperature distribution in a medium
Its most general (vector) form for mult
PROBLEM 6.38
KNOWN: Flow over a at plate. Velocity and temperature of two uids. Variation of boundary
layer thickness with x for laminar ow.
FIND: (a) Location Where transition to turbulence occurs for each uid, (b) Plot of velocity boundary
layer thickne
PROBLEM 12.8
5
2
KNOWN: Radiation from a diffuse radiant source A1 with intensity I1 = 1.2 10 W/m sr is
incident on a mirror Am, which reflects radiation onto the radiation detector A2.
FIND: (a) Radiant power incident on Am due to emission from the sourc
(Limb om' 9610
PROBLEM 8.8
KNOWN: Velocity and temperature proles for laminar ow in a paraEiel plate channel.
FIND: Mean velocity, um, and mean (or bulk) temperature, Tm, at this axial position. ?lot the veiocity
and temperature distributions. Comment on
Homework-9
ME 3242: Heat Transfer, Spring 2014
University of Connecticut
Instructor: Kamal Kumar
Assigned: 25-April, 2014
Due: 30-April, 2014
(All questions carry equal weightage)
1. A small radiant source A1 emits diffusely with an intensity 1 = 1.2 105
Homework-8
ME 3242: Heat Transfer, Spring 2014
University of Connecticut
Instructor: Kamal Kumar
Assigned: 14-April, 2014
Due: 21-April, 2014
(All questions carry equal weightage)
INTERNAL FLOWS
1. Velocity and temperature profiles for a laminar flow in a
Lecture 15
Wednesday
3/2/2016
Transient Conduction:
The Lumped
Capacitance Method
Chapter 5: Sections 5.1 5.3
Transient Conduction:
cpdT/dt 0
A heat transfer process for which the temperature varies with time, as well
as location within a solid.
It is i