4. Heat transfer mechanisms

4.1 Heat transfer basics

In order to study a heat transfer phenomenon, three elements must first be defined:

• the medium, which may be made up of several regions of the same medium, or the superposition of several media. It is also necessary to know the state of the matter that constitutes the media (solid, liquid or gas);

• the temperature gradient, which is the difference in temperature between the inside and outside of a system made up of one or more media. These temperatures can evolve over time, naturally tending towards...