A hole of diameter D = 0.25 m is drilled through the center of a solid block of square cross section with w = 1 m on a side. The hole is drilled along the length, l = 2 m, of the block, which has a thermal conductivity of k = 150 W/m·K. The four outer surfaces are exposed to ambient air, with T[infinity],2 = 25°C and h2 = 4 W/m2·K, while hot oil flowing through the hole is characterized by T[infinity],1 = 330°C and h1 = 50 W/m2·K. Determine the corresponding heat rate and surface temperatures.

Explanation:

So, heat rate can be calculated as follows:

Surface temperatures can be calculated as follows:

answer:

explanation:

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