Modeling of the thermal and hydraulic performance of plate fin, strip fin, and pin fin heat sinks-influence of flow bypass

Abstract

Tests have been conducted in a wind tunnel with seven types of heat sinks including plate fin, strip fin, and pin fin heat sinks. In the case of strip fin, and pin fin heat sinks, both in-line and staggered arrays have been studied. The pin fin heat sinks had circular and square cross-sections. For each type, tests were run with fin heights ( ) of 10, 15, and 20 mm while the heat sink width ( ) was kept constant and equal to 52.8 mm. In total, 42 different heat sinks were tested. The width of the wind tunnel duct ( ) was varied in such a way that results were obtained for = 0 84, 0.53, and 0.33. The wind tunnel height ( ) was varied similarly, and data were recorded for = 1, 0.67, and 0.33 while the duct Reynolds number was varied between 2 000 through 16 500.An empirical bypass correlation has been developed for the different fin designs. The correlation predicts the Nusselt number and the dimensionless pressure drop and takes into account the influence of duct height, duct width, fin height, fin thickness, and fin-to-fin distance. The correlation parameters are individual for each fin design. Further, a physical bypass model for plate fin heat sinks has been developed to describe the bypass effect.

An experimental and computational investigation of thermal air flows through perforated pin heat sinks

“…Pin fin heat sinks (PFHSs) can be an effective alternative to plate fin heat sinks since they have the advantage of hindering the development of the thermal boundary layer on smooth surfaces responsible for limiting the heat transfer rates in plate fin designs, Zhou & Catton [3]. Several previous investigations of heat transfer and pressure drops of PFHSs have demonstrated clearly their superiority over plate fin designs and have attempted to optimise these by studying, for 3 example, the effect of pin cross-sectional shape Soodphakdee et al [6], Jonsson & Moshfeghor [7] and the benefits of combining plate and pin fins within compound heat sinks, Yang & Peng [8,9].…”

A numerical investigation of thermal airflows over strip fin heat sinks

“…Jonsson and Moshfegh [23], for example, studied the performance of strip fins, square pins, circular pins, and plate fin with in-line and staggered arrangements. Using a coarse arrangement of strip fins with AR=5.3, the pressure drop in their experiments was substantially lower than for a denser arrangement of pins but with a similar thermal resistance.…”

Effect of Bypass on Overall Performance of Pin-Fin Heat Sinks

“…They developed a corelation relating heat transfer performance to Reynolds number and other important characteristic parameters. Jonsson et al 22,23 also developed an empirical correlation for different fin designs. Their correlation predicts the Nusselt number and the dimensionless pressure drop and takes into account the influence of duct height, duct width, fin height, fin thickness, and fin-fin spacing.…”

“…Rizzi et al 20,21 and Jonsson et al 22,23 investigated the effects of bypass on heat transfer and pressure drop in CPFHS, SPFHS, and PPFHS experimentally. Rizzi et al [20,21] developed a number of data reduction parameters and procedures using scaling for heterogeneous media suggested by volume averaging theory.…”