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

For fins of equal length, which fin has the largest heat transfer rate? Assume the gas properties are those of air atT=350K. Use correlations in Table 7.3 from the book.