Consider a composite solid block of the shape of the frustum of a cone with the curved surface perfectly insulated shown in figure below. The block has two layers of thicknesses I (layer 1) and l2 (layer 2). The exposed surface of layer 1 (thermal conductivity, k = 5 W/m °C) has a radius r (= 0.18 m) and a temperature of T (= %3D 200°C), and that of layer 2 (thermal conductivity, k2 = 2 W/m °C) has a radius r2 (= 0.08 m) and a temperature To (= 100°C). If l = 0.2 m, and l2 = 0.15 m, calculate (a) the temperature distributions in the two layers, (b) the rate of heat flow through the assembly, (c) the heat flux at the open end of layer 2, and (d) the temperature and heat flux at the surface of contact of the layers. %3D Insulation T

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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.