Establishing the fundamental laws
Thermal energy transmission - Conduction

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BE8200 V1 Article

Establishing the fundamental laws


Thermal energy transmission - Conduction

Author : Alain DEGIOVANNI

Publication date: April 10, 1999 | Lire en français

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1. Establishing the fundamental laws

For notations and symbols, see end of article.

The observable macroscopic effect is an equalization of temperatures; however, if certain zones are maintained at constant temperatures by heat input (heat sources) or heat output (heat sinks), there is a continuous diffusion of heat from the hot region to the cold region. Hence the problem: having defined a material system in terms of its geometry and thermophysical characteristics, as well as any heat sources and interactions with the external environment, we now investigate the temperature field and its evolution over time.

1.1 General definitions

Heat flow through a surface (φ in W)

This is the amount of heat (Q in...

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