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MODES DE TRANSFERT THERMIQUE
Matériel didactique : Machines à calculer
Objectif opérationnel : A la fin de la leçon, l'élève sera capable de définir et de lier les lois spécifiques à ces modes de transfert thermique.

Rappel

En quoi s'exprime la chaleur dans le SI ?

Quand est-ce qu'on a la chaleur?

Rappel

La chaleur dans le SI s'exprime en joule.

L'énergie thermique est transférée du corps chaud au corps froid.

Motivation

Pour mieux terminer un transfert, on doit s'atelier sur quoi? 

Motivation

Pour mieux terminer un transfert, on doit s'atelier sur les modes de transfert.

Annonce du Sujet

Qu'allons-nous étudier aujourd'hui?

Annonce du Sujet

Aujourd'hui nous allons étudier les modes de transfert thermique.

Analyse

Quels sont les modes de transfert thermique?

Analyse

Les modes de transfert thermique les mieux connus sont :

  • La conduction
  • La convection
  • Le rayonnement

La conduction est le mode de transfert thermique dans les solides, qui se fait sans transfert des matières.

Cependant, une loi explicite de la conduction est la loi de FOURIER qui a pour formule :

Δt =t2-b1

: La puissance thermique W

A = m2

λ = La conductivité thermique

L= m

: La puissance thermique W

6 =5,67.10-8 : Constante de Stefan T°C °K

A : Aire  de surface (m2)

Ɛ : Emissivité 

Qu'est-ce que nous venons d'étudier?

Nous venons d'étudier les modes de transfert thermique.

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