椭圆矩形翅片管通道内流动与换热特性的数值研究  

Numerical Study on Flow and Heat Transfer Characteristics for Rectangular Finned Elliptical Tube

作　　者：陈富强[1] 阴继翔[1] 何泽明[1] 

机构地区：[1]太原理工大学电气与动力工程学院,山西太原030024

出　　处：《中北大学学报（自然科学版）》2014年第1期34-40,共7页Journal of North University of China(Natural Science Edition)

基　　金：山西省自然科学基金资助项目(2012001024-4)

摘　　要：利用Fluent软件，在椭圆管周长给定的情况下，对椭圆基管长短轴比（3，4，5，6，8，10）不同的椭圆矩形翅片管外空气侧层流流动与换热进行数值研究，分析了椭圆管长短轴之比K和雷诺数（Re）对翅片管空气侧换热和流动的影响．结果表明：在计算的Re数范围内，随着Re数的增加，努谢尔特数（Nu）逐渐增加，阻力系数（f）逐渐减小；K=10的翅片管外空气侧换热特性数（Nu）比K=3的翅片管减小约4．66％～9．83％，K=10的翅片管阻力系数（f）比K=3的翅片管减小约51．67％～56．6％．就翅片效率而言，长短轴之比K=3时翅片的效率最高．通过对综合性能参数j/f分析得出，在椭圆管等周长下，长短轴之比K越大，综合性能越高．Abstract： In the situation of giving the elliptical tube circumference, the heat transfer and flow of the laminar flow state in the rectangular fins with different kinds of elliptical tube in different ratios of major and minor axis（3,4,5,6,8,10） were investigated. Fluent software was used to analyze the influence of the ratio of major and minor axis K of the elliptical tube and Reynolds number （Re） on heat transfer and flow of finned tube air side. The results indicate that with the increase of Re number in the calculation range, the Nusselt number （Nu） increases and the drag coefficient （f） decreases, the heat transfer characteristic number （Nu） for finned tube air side heat of K - 10 decreases by 4.66 % --9.83 % , when compared to finned tube of K = 3, the drag coefficient （f） for finned tube air side of K = 10 decreases by approximately 51.67% --56.6% when compared to finned tube of K = 3. In terms of fin efficiency, the ratio of the length of the shaft fin efficiency is highest when K = 3, through analyzing comprehensive performance parameters j/f, it is found that in the same perimeter of the elliptical tubes, the greater the ratio of major and minor axis K, the higher the compre- hensive performance.

关 键 词：椭圆翅片管 翅片效率 综合性能 数值模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理]