A hole of diameter D = 0.25 m is drilled through the center of a solid block of square cross section with w = 1m on a side. The hole is drilled along the length, 1 = 2 m, of the block, which has a thermal conductivity of k = 150 W/m ∙ K. The outer surfaces are exposed to ambient air, with T∞,2 = 25°C and h z = 4 W/m2 ∙ K. while hot oil flowing through the hole is characterized by Tx.1 = 300°C and h1 = 50 W/m2 ∙ K. Determine the corresponding heat rate and surface temperatures.

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Air Thermocouple wire, D T, h -T, Copper block, T,