An Experimental Investigation of Turbulent Forced-Convection into a Horizontal Finned Eccentric Annulus

In this research, an experimental investigation conducted on the forced heat convection for air flowing through a horizontal eccentric annulus. Two different types of the inner finned tube (with rectangular interrupted fins or with trapezoidal interrupted fins) utilized. The outer tube is made of Acrylic (PMMA), while the inner finned tube made of Copper. The internal wall of the inner finned tube electrically heated with five different input power levels. Five various values of airflow velocities utilized. The purpose of the present research was to study and analyze the influence of inner finned tube types, wall heat flux, and air velocity on the hydraulic and thermal performance experimentally. The experimental results show that the local Nusselt number for the case of trapezoidal interrupted fins is higher than that in the case of rectangular interrupted fins. As well as, the forced-convection performance of the inner finned tube with trapezoidal interrupted fins in terms of average Nusselt number is more significant about 11% to 20.3% than that the rectangular interrupted fins. The results of the present study compared to the correlation of the last study, and a good convergence remarked.