Modes of Heat Transfer
There are three Modes of Heat Transfer from one place to another-
- In this mode of heat transfer, heat is transferred from one place to another without the net motion of the molecules of the medium.
- Conduction generally takes place in solids.
- It is a slow process compared to convection and radiation.
- It is experimentally observed that at a steady state.
The rate of heat flow (∆Q/∆t) is proportional to (T1-T2)
T1, T2 are temp. at hot and cold ends at steady states
Also (∆Q/∆t) is proportional to Area
and inversely proportional to the length
Thus, (∆Q/∆t) = KA (T1-T2)/L
K= thermal conductivity of a material
SI Unit of K is watt/mK or watt/mC
- K depends only on the type of materials.
- Length is always taken along the Flow of Heat
- Cross-Sectional area (A) is taken perpendicular to the flow of heat.
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