Experimental Investigation of Forced Convection Heat Transfer over Horizontal Tube with Conical Fins for Different Fin Spacings and Different Inclination Angles

This paper was performed to experimentally studied the heat transfer over the horizontal tube with conical fins for different fin spacings and different inclination angles. The air entering the test section first contacts the large surface of the conical fin. Therefore, the conical fin both directs the air towards the heating surface and increases the heat transfer surface area. The experiments were conducted for three different inclination angles (45º, 60º and 80º) and three different fin spacings (10, 12 and 15 mm). Water and air were used as hot and cold fluid in these experiments, respectively. The temperature of water, which was the heating fluid, was kept fixed at 65 °C. The cold fluid entered the test section at eight different air flow velocities (2 – 20 m/s). The experimental results indicated that the Nusselt number at each inclination angle for the 10-mm fin spacing was almost the same. Moreover, for the 15-mm fin spacing, the highest Nusselt number was obtained at 80º and lowest at 60º for Re > 5x104, while the Nusselt number was almost the same at each inclination angle for Re 5x104. It was determined that the lowest pressure drop was obtained at 80º for both 10 and 15 mm.The accepted manuscript in pdf format is listed with the files at the bottom of this page. The presentation of the authors' names and (or) special characters in the title of the manuscript may differ slightly between what is listed on this page and what is listed in the pdf file of the accepted manuscript; that in the pdf file of the accepted manuscript is what was submitted by the author