Pin fins are to be specified for use in an industrial cooling application. The fins will be subjected to a gas in cross flow at V = 10 m/s. The cylindrical fin has a diameter of D = 15 mm, and the cross-sectional area is the same for each configuration shown in the sketch.

For fins of equal length and therefore equal mass, which fin has the largest heat transfer rate? Assume the gas properties are those of air at T = 350 K.

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= V,T_ Configuration A V.T_ Configuration B V.T Configuration C