Thermal conduction is the transport of energy in a medium due to a temperature gradient and the physical mechanism is that of random atomic or molecular activity. The quantity of heat flow through the cross section of a solid body over time ‘t’ in a steady state is governed by the Fourier’s law of heat conduction
Heat conduction through a wall is given by
Where the symbols carry their usual meanings
Linear conduction unit
There are 3 main elements in linear conduction unit
2. Various inserts
3. A movable part with a cooler
- Heater:- It consists of external insulation, lid, brass rod and a electrical heater element. Together with the inserts and under the insulation there are 9 temperature measuring points.
- Inserts:- Insert 1 has 3 temperature measuring points. Both insert 1 and 2 has brass rod of same diameter with the heater and cooler. But insert 2 has corrosion resistant rod so no temperature measuring points. Insert 3 has brass rod lesser in diameter than heater and cooler.
- Cooler:- The cooler consists of external insulation and brass rod. This rod has bores through which cooling water can flow.