Heat transfer
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| - | == Conduction == | + | == 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 thermal conductivity of the material | + | *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> | ||
| - | Q_{Conduction} = -k | + | Q_{Conduction} = -k*A*dT/dX |
</math> | </math> | ||
| + | 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 == | == 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:
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
