An experimentally study the Influence of Axis Ratio of the Elliptical Fin Shape to the Heat transfer Performance by Natural Convection

All chemical petroleum and mechanical engineering industries specialize in how to transfer heat through heat exchangers with high efficiency, less cost, and volume by extended solid surface to increase the heat transfer performance. This prominent solid body is called fin.The rate of heat transfer depends on the fin materials, shapes, size parameters, and surface area of the fin. Elliptical annular fins are one of the most popular choices for exchanging the heat transfer rate from the primary surface of the fins base. The heat transfer performance of the fin expressed in terms of fin effectiveness, fin efficiency, overall fin efficiency and thermal resistance as a function of the ambient temperature has been studied for a wide range from 100 to 260 oC. This article aims to study the process of influencing the change of the ratio of the oval fin diameters on the efficiency of heat transfer from the surface of this fin. This done by different major [a] and minor [b] axis ratio (a\b) as follow: [2,2.21,2.44,2.65, 2.88,3.13,3.38 and 3.65] at natural convection The results showed that there is an optimum major and minor axis ratio for elliptical fin at (a/b = 2.65). Which have a high performance of heat transfer by free convection than the others ratios. Also, the fin heat transfer performance has a significant change due to the axis ratio of elliptical fin shape for this wide temperature range used with overall fin efficiency of up to 60%.