Wiedemann Franz Law and its derivation

Assume that a homogeneous isotropic material is subjected to a temperature gradient dT/dx. The flow of heat will result in the direction opposite to the temperature gradient through the conducting medium.

The heat flux Q (heat flow per unit time per unit area) will be proportional to the temperature gradient i.e Q∞dT/dx

Or                        Q= -K dT/dx Continue reading “Wiedemann Franz Law and its derivation”