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Heat transfer

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(Conduction)
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== Conduction ==
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                      == Conduction ==
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*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 thermal conductivity of the material and the temperature difference between them.  
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*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:  
*Mathematically, it can be described by using the Fourier's law:  
:<math>
:<math>
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Q_{Conduction} = -k\Delta T
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                Q_{Conduction} = -k*A*dT/dX
</math>
</math>
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Where
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      k = Thermal conductivity of the material (W/m-K)
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      A = Cross-sectional area of the object parallel to heat conduction
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      T = Temparature (K)
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      X = Length of the object
== Convection ==
== Convection ==

Revision as of 10:59, 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*dT/dX

Where

     k = Thermal conductivity of the material (W/m-K)
     A = Cross-sectional area of the object parallel to heat conduction
     T = Temparature (K)
     X = Length of the object

Convection

Radiation

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