MMU FET EME4016
HEAT TRANSFER
T2 2015-16
Tutorial: Conduction 1
1. What is the thickness required of a masonry wall having thermal conductivity 0.75 W/m.K if the
heat rate is to be 80 % of the heat rate through a composite structural wall having a thermal
MMU FET EME 4016
HEAT TRANSFER
T2 2015-16
Tutorial: Radiation 1
1. Beginning from Plancks law that gives the radiation flux per unit wavelength for a black
body, obtain the emissive power of a black body by integrating over all wavelengths.
Hints: Let z=h
MMU FET EME 4016
HEAT TRANSFER
T2 2015-16
Tutorial: Radiation 2
1. Determine the view factors stated for the geometries shown below in a, b, and d.
[a: 0.637, 1, 0.363; b: 0.637, 0, 0.363; d: 1, 0, 0.0556, 0.4444, 0.5]
2. A sphere of diameter 1 m is enclo
MMU FET EME 4016
HEAT TRANSFER
T2 2015-16
Tutorial: Conduction 2
1. Consider a large 5 cm thick brass plate (k=111W/mK) in which heat is generated
uniformly at a rate of 2 105 W/m3. Left side of the plate is insulated while the other
side is exposed to an
Radiation 1
MMU FET EME 4016
HEAT TRANSFER
RADIATION 1
Thermal radiation is the mode of heat transfer by electromagnetic (EM) waves that are in the range of
wavelengths = 0.1 to 100 , and includes ultraviolet, visible light (0.38 0.76 ), and infrared
regi
Conduction 3
MMU FET EME 4016
HEAT TRANSFER
CONDUCTION 3
TRANSIENT CONDUCTION
Transient conduction, or unsteady conduction, refers to the general class of conduction where the
temperature in the solid varies with time. Hence they are time-dependent proble
Conduction 1
MMU FET EME 4016
HEAT TRANSFER
CONDUCTION 1
INTRODUCTION TO HEAT TRANSFER
1. Study of heat energy transfer between material bodies as a result of temperature difference.
2. Emphasis on the local rate of heat energy flow, rather than the compl
Conduction 2
MMU FET EME 4016
HEAT TRANSFER
CONDUCTION 2
STEADY STATE HEAT TRANSFER IN 1-D WITH HEAT SOURCE
With the presence of a heat source or heat generation in the body, the heat conduction equation is
solved. For one-dimension, it is an ODE (ordinar
Radiation 2
MMU FET EME 4016
HEAT TRANSFER
RADIATION 2
HEAT EXCHANGE BETWEEN NON-BLACK BODIES
Net radiation at a non-black surface.
The total radiation incident to a surface is called irradiation G. Of this G, the radiation reflected from the
surface is g