sir in solids why the rate of flow of heat directly proprtional to temparature difference between two ends and directly proportional to area of face of a solid and inversely proportional to length of a conductor? give reasons to each one
Asked by venkat
22nd September 2017,
6:46 PM
Answered by Expert
Answer:
- The rate of heat conduction through a medium depends on the geometry of the medium, its thickness, and the material of the medium, as well as the temperature difference across the medium.
- We know that wrapping a hot water tank with glass wool (an insulating material) reduces the rate of heat loss from the tank.
- The thicker the insulation, the smaller the heat loss.
- We also know that a hot water tank loses heat at a higher rate when the temperature of the room housing the tank is lowered.
- The temperature difference across the wall is ΔT=t2 -t1
- Experiments have shown that the rate of heat transfer Q through the wall is doubled when the temperature difference ΔT across the wall or the area A normal to the direction of heat transfer is doubled, but is halved when the wall thickness L is doubled.
- Therefore it is concluded that the rate of heat conduction through a plane layer is proportional to the temperature difference across the layer and the heat transfer area, but is inversely proportional to the thickness of the layer.
Answered by Expert
24th September 2017,
9:38 AM
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