# Heat transfer

(Difference between revisions)
 Revision as of 03:04, 1 December 2005 (view source)Ninad (Talk | contribs)← Older edit Revision as of 10:59, 1 December 2005 (view source) (→Conduction)Newer edit → Line 1: Line 1: - == 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 and the temperature difference between them. + *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: :[itex] :[itex] - Q_{Conduction} = -k\Delta T + Q_{Conduction} = -k*A*dT/dX [/itex] [/itex] + 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:
$Q_{Conduction} = -k*A*dT/dX$

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
```