# Heat transfer

(Difference between revisions)
 Revision as of 11:04, 1 December 2005 (view source)← Older edit Revision as of 12:40, 1 December 2005 (view source)Jola (Talk | contribs) Newer edit → Line 4: Line 4: *Mathematically, it can be described by using the Fourier's law: *Mathematically, it can be described by using the Fourier's law: - :$+ :[itex]Q_{Conduction} = -k*A*\frac{dT}{dx}$ - Q_{Conduction} = -k*A*dT/dX + - [/itex] + Where Where - + :$Q = \mbox{Heat conducted}\;[W]$ - Q = Heat conducted (W) + :$k = \mbox{Thermal conductivity of the material}\;[W/m\,K]$ - + :$A = \mbox{Cross-sectional area of the object parallel to heat conduction}\;[m^2]$ - k = Thermal conductivity of the material (W/m-K) + :$T = \mbox{Temperature}\;[K]$ - + :$x = \mbox{Length of the object}\;[m]$ - A = Cross-sectional area of the object parallel to heat conduction (m2) + - + - T = Temparature (K) + - + - X = Length of the object (m) + == Convection == == Convection ==

## Revision as of 12:40, 1 December 2005

                     == Conduction ==

• Conduction can be defined as the heat transfer through a substance because of a temperature gradient. The rate of heat transfer by conduction between two regions of a substance is proportional to the temperature difference between them. The constant of propotionality is called thermal conductivity of the material.
• Mathematically, it can be described by using the Fourier's law:
$Q_{Conduction} = -k*A*\frac{dT}{dx}$

Where

$Q = \mbox{Heat conducted}\;[W]$
$k = \mbox{Thermal conductivity of the material}\;[W/m\,K]$
$A = \mbox{Cross-sectional area of the object parallel to heat conduction}\;[m^2]$
$T = \mbox{Temperature}\;[K]$
$x = \mbox{Length of the object}\;[m]$