A 3-cm thick slab which can be modelled as a plane wall of thermal conductivity k = 30 W/m·K generates heat uniformly at egen = 5 × 106 W/m3. As shown in the figure below, it is
sheathed on both sides by carbon-silicon steel1 sheets 1 cm thick and fitted with wide longitudinal fins of the same material of dimensions 2 cm in length and 1 mm in thickness which are spaced 1 cm apart on centres. The outside air temperature is T∞ = 20°C. If the temperature of the slab should not exceed 400°C, what is the minimum allowable external convective heat transfer coefficient h? State all assumptions made. White Question 2.81, Solution 2.71
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