Conduction

Thursday, 3 May 2018

11:37 AM

Metals are good conductors of heat

Liquids are soso

Gases are poor conductors of heat

 

Conduction happens only when there is a temperature difference

 

 

kA - cross sectional area

 - temperature difference

 - slab width

 

 

 

 

 

 

 

Sometimes the conducting object is a composite of two different materials in series.

What is the steady state heat transfer rate?

 

] k1 k2 [

 

 

 

 

 

 

In general;

 

A(T_H-T_C)/[R1+R2+R3+…]

 

 

Think of R1+R2+R3 as the thermal resistance in a resistor