Augmentation of Natural Convection Heat Transfer from a Fin by Lateral Hexagonal Perforations

Abstract

In this study the enhancement of heat transfer from a horizontal rectangular fin subjected to natural convection provided with lateral hexagonal perforations is investigated using one dimensional finite element technique. The orientation of these perforations is described as they have two sides parallel to the base and tip of the fin. The perforated fin is compared with its equivalent solid one. The parameters considered are geometrical dimensions and thermal properties of the fin and these of the perforations. This study involves enhanced heat transfer surfaces that provide increased turbulence and a better flow distribution. Also, it considered the gain in fin area and of heat transfer coefficients due to perforations. From this study and for certain values of hexagonal dimension and spaces between perforations, it is found that there is an augmentation in heat transfer dissipation of the perforated fin over than that of the equivalent solid one. Moreover, the heat transfer enhancement of the perforated fin increases as the thickness and thermal conductivity of the fin are increased.