Abstract: The heat tranfer and pressure drop performance of cross flow longitudinally finned tube banks heat exchanger are reported. The experimental information are presented and the influence of pitches is analyzed. The transversal pitch is a chief factor in flow friction of the tube banks. Increasing the transversal pitch can greatly decrease flow friction. Both transversal pitch and longitudinal pitch influence the heat transfer of longitudinally finned tube banks to the same degree. So a better performance of the tube banks can be obtained by increasing the transversal pitch in terms of lower flow friction and higher heat tranfer. For a longitudinally finned tube bank of St/D =3. 29 and SL/D =1. 6, the heat transfer coefficient can be increase by 9%-12. 5% and flow friction can be decrease by 15%-65% comparedwith the smooth tube bank of the same pitches. This paper also analyses the lower flow friction characteristcs of longitudinally finned tube banks and their enhanced heat transfer.

摘要： 对纵肋管束换热器的传热、阻力特性进行了试验研究,得出其实验关系式.以此分析管束节距的影响,指出横向节距是决定纵肋管束流阻的首要因素,增加横向节距将大幅度减小流胆;而横向节距和纵向节距对换热的影响程度基本相同.对于1组节距为S_t/D=3.29、S_l/D=1.6的纵肋管束,其实际换热系数可增加9%～12.5%,流阻系数可降低15%～65%.结果表明,纵助管束具有低流阻特性和较强的传热强化作用.