11.7 Spherical Shell Method
In spherical shell method employed by Nusselt two hollow concentric spheres, one of copper and 30 cm diameter (A) and the other (B) of aluminium and 15 cm diameter are used; the spheres can be divided into two parts and can also be united (Fig. 11.11).
Fig. 11.11 Nusselts ’ apparatus
The material under test such as powdered cork, charcoal and clay is placed between the intervening space of the two spheres. The source of heat is placed at C, which is electrically driven.
Thermocouples are provided to measure the temperatures of the material at point of different radii which will be spheres of isothermal surfaces. ...
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