A 10 cm diameter cylindrical bar, heated in furnace to a uniform temperature of 2000 C, is allowed to cool in an environment with convective coefficient of 150 W/m2 K and temperature 400 Determine i) the temperature required to cool the centre of the bar to 600 C ii) temperature of the surface at this instant. For the material of the bar thermal conductivity = 50 W/m K and thermal diffusivity = 2.0 X 10-5 m2/sec.

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Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.