화학공학소재연구정보센터
Heat Transfer Engineering, Vol.19, No.4, 55-67, 1998
Experimental and 3-d numerical analysis of the thermal-hydraulic characteristics of elliptic finned-tube heat exchangers
Fluid flow and heat transfer over a 4-row, elliptic, finned-tube heat exchanger having an axis ratio of 2.83:1 are studied experimentally and numerically. Three types of finned-tube configurations have been investigated under dry and wet conditions for different values of inlet frontal velocity ranging from 2 to 7 m/s: two elliptic finned tubes with staggered and in-line arrangements and one circular tube with staggered arrangement. The experimental results indicate that the average heat transfer coefficient of an elliptic finned tube is 35-50% of the corresponding circular finned tube having the same tube perimeter; while the pressure drop for an elliptic finned-tube bank is only 25-30% of the circular finned-tube bank configuration. Three-dimensional numerical results of a laminar model for dry coils are also presented and are compared with the experimental data.