Thermal performance of in-line diamond-shaped pin fins in a rectangular duct

This work experimentally studied the pressure drop and heat transfer of an in-line diamond-shaped pin-fin array in a rectangular duct by using the transient single-blow technique. The variable parameters are the relative longitudinal pitch (XL = 1.060, 1.414, 1.979) and the relative transverse pitch (XT = 1.060, 1.414, 1.979). The empirical formula for the heat transfer is suggested. Besides, the optimal inter-fin pitches, XT = 1.414 and XL = 1.060, are provided based on the largest heat dissipation under the same pumping power.