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.
![1343_e7d7904b-16d7-4727-9691-77dec3dbf827.png](https://secure.tutorsglobe.com/CMSImages/1343_e7d7904b-16d7-4727-9691-77dec3dbf827.png)
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.