The three modes of heat transfer
TH
TL
Conduction
Convection
(Conduction
+ advection)
Radiation
Both
require a
material
medium
Does not
require a
material
medium
Conduction
Convection
Radiation
Tspace << Tearth
<< Tsun
Q rad
Tearth < Tsun
Tsun > Tearth
Radiation does not require a medium, but
it can go through one, even if it is at a lower
temperature than the two surfaces exchanging
radiation.
Radiation is a surface phenomenon.
I.e., radiation heat transfer occurs as an
exchange between surfaces.
Mechanical engineering
Electrical engineering
Electrical power waves
Radio and TV waves
Microwaves
Thermal
radiation
Infrared radiation
Visible light
Ultraviolet radiation
High energy physics
X rays
γ waves
Cosmic rays