Q2: A layer of 2.5 in thick firebrick (kb 1.0 Btu/hr ft °F) is placed between two in.- thick steel plates (ks 30 Btu/hr ft °F). The faces of the brick adjacent to the plates are rough, having solid-to-solid contact over only 35 % of the total area, with the average height of asperities being L2-2/32 in. If the surface temperatures of the steel plates are 250° and 800°F, respectively. The conductivity of air ka is 0.02 Btu/hr ft °F, determine the rate of heat flow per unit area. %3D

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