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ME 301: Conduction and Radiation Heat
Transfer
Dr. Mohammad Nasim Hasan
Associate Professor
Department of Mechanical
Engineering
BUET, Dhaka-1000
Unsteady Heat Transfer
Simple cases of one-dimensional, steady-state conduction with
or without internal gen
ME 301: Conduction and Radiation Heat
Transfer
Dr. Mohammad Nasim Hasan
Associate Professor
Department of Mechanical
Engineering
BUET, Dhaka-1000
For short periods of time, most bodies
can be modeled as semi-infinite solids.
Since heat does not have suf
ME 301: Conduction and Radiation Heat
Transfer
Dr. Mohammad Nasim Hasan
Associate Professor
Department of Mechanical
Engineering
BUET, Dhaka-1000
Fin: Extended Surface to increase Heat Transfer
Fins are surfaces that extend from an object to increase the
ME 301: Conduction and Radiation Heat
Transfer
Dr. Mohammad Nasim Hasan
Associate Professor
Department of Mechanical
Engineering
BUET, Dhaka-1000
TRANSIENT HEAT CONDUCTION IN LARGE
PLANE WALLS, LONG CYLINDERS AND SPHERES
WITH SPATIAL EFFECTS
The formulati
FINSWEB.TEX
ME 353 M.M. Yovanovich
Fins or Extended Surfaces
Fins or extended surfaces are used to increase the heat transfer rate from surfaces which are
convectively cooled by gases (air) under natural or forced convection. The characteristics of
ns: (a
ME 301: Conduction and Radiation Heat
Transfer
Dr. Mohammad Nasim Hasan
Associate Professor
Department of Mechanical
Engineering
BUET, Dhaka-1000
Steady Heat Conduction: Application of Thermal
Resistance Concept
In the present analysis following assumptio
ME 301: Conduction and Radiation Heat Transfer
Dr. Mohammad Nasim Hasan
Associate Professor
Department of Mechanical Engineering
BUET, Dhaka-1000
Different Co-ordinate Systems
General Heat Conduction Equation:
For Isotropic and Constant Property Medium
2
ME 301: Conduction and Radiation Heat
Transfer
Dr. Mohammad Nasim Hasan
Associate Professor
Department of Mechanical
Engineering
BUET, Dhaka-1000
Topics to be covered
Basic modes of heat transfer
General conduction equation for one dimensional
and three
9/17/2011
General Conduction Equation for
One Dimensional and Three
Dimensional Situation
General Heat Conduction Equation in
Cartesian Coordinates
Consider a small volume of a solid with internal heat
g
generation and unsteady state condition.
y
For simp
9/17/2011
Conduction and Radiation Heat
Transfer
ME 301
Course Teacher:
Dr. Mohammad Arif Hasan Mamun
Associate Professor
Department of Mechanical Engineering
BUET
Email: [email protected]
Room No. ME 415
Detail Outline of Course:
Basic modes of hea
9/17/2011
Steady State Conduction in Different
Geometrics and Composite Structures
p
for One Dimensional Situation
Electrical analogy and Thermal Circuits:
Thermal Resistance for Conduction Heat Transfer:
q = kA
i=
q
V
Re
dT T1 T2 T1 T2
=
=
L
dx
Rcond
kA
RADIATION HEAT TRANSFER
ME 301
CONDUCTION AND RADIATION HEAT TRANSFER
Md. Mahbubul Islam
Lecturer, Dept. of MechE
BUET, Dhaka-1000
Download Course Materials from
www.mislam.info/ocw.html
ME 301: L1
Bangladesh University of Engineering and Technology
1
RAD
RADIATION HEAT TRANSFER
ME 301
CONDUCTION AND RADIATION HEAT TRANSFER
Md. Mahbubul Islam
Lecturer, Dept. of MechE
BUET, Dhaka-1000
Download Course Materials from
www.mislam.info/ocw.html
ME 301: L2
Bangladesh University of Engineering and Technology
1
RAD
CHAPTER 2: Introduction to Conduction
2.1 Conduction Rate Equation
Fouriers law was developed from observed phenomena.
T2
r
qx
x
x
T1
Consider an experiment for which conditions can be modified to
determine how heat transfers.
Examine a cylindrical rod
Chapter 1
Introduction to Heat Conduction and
Mass Diusion
1
Engineering Analysis of Heat Conduction Problems
Heat transfer engineers investigate the rate of transport of thermal energy in engineering
systems. Heat conduction is the primary thermal energy