Comparative study of fluid flow and heat transfer characteristics on the three kinds of fin-tube heat exchanger with delta winglets longitudinal vortex
LIU Dan-dan
WU Xue-hong
ZHANG Lin
MENG Hao
LYU Yan-li
LI Fang-xing
Abstract：In the present study,the heat transfer and fluid flow characteristics of fin-tube heat exchangers of circular-tube,equal-diameter elliptic-tube and equal-perimeter elliptic-tube with delta winglets longitu-dinal vortex was presented based on the numerical simulation. The result showed that the temperature and velocity field of equal-perimeter elliptic-tube fin heat exchanger more uniform,and its heat transfer per-formance was the best,and the Nu number of equal-diameter elliptic-tube fin heat exchanger was the lar-gest,which was 2. 2% ~ 6. 1% higher than that of circular-tube heat exchanger with delta winglets, 6. 5% ~ 8. 3% higher than that of equal-radius elliptic-tube heat exchanger and with delta winglets and 29. 1% ~ 33. 5% higher than that of flat fin-tube heat exchanger. Considering from the overall perform-ance,the delta winglets longitudinal vortex oval fin-tube heat exchanger fit for moderate and high Reynolds numbers.
Keywords：fin-tube heat exchangerdelta winglets longitudinal vortexfluid flow and heat transfer charac-teristics
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 72-76,92 )