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Heat transfer

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                     == 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}


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]



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