The amount of thermal energy ΔQ transferred through an area A per unit time Δt is called the heat flux. In the case of conduction, the heat flux is governed by the following relationship:
where ΔT is the temperature difference along a distance Δx in the direction of conduction and k is the thermal conductivity of the material. This is known as Fourier's Law of Heat Conduction.
Properties of some materials:
|Material||Conductivity (W/m·°C)||Specific heat (J/kg·°C)||Density (kg/m3)|
The following simulations examine how each of these factors affects the rate of heat conduction. Click an image to open the corresponding simulation.