NUMERICAL STUDY ON THE INFLUENCING MECHANISM OF TWISTED RATIO IN OUTWARD CONVEX CORRUGATED TUBES WITH A TWISTED TAPE INSERT

被引：0
|
作者：
Han, Huaizhi [1 ]
Yang, Longbin [1 ]
Hu, Yiran [1 ]
Yu, Ruitian [1 ]
Zhang, Qun [1 ]
机构：
[1] Harbin Engn Univ, Coll Power & Energy Engn, Harbin, Heilongjiang, Peoples R China
来源：
THERMAL SCIENCE | 2018年 / 22卷
基金：
中国国家自然科学基金;
关键词：
corrugated tube; twisted tape insert; heat transfer enhancement; numerical simulation; HEAT-TRANSFER ENHANCEMENT; GROOVED TUBE; FLOW;
D O I：
10.2298/TSCI170614042H
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
Numerical investigations were conducted on flow and heat transfer in an outward convex corrugated tube with various structural twisted tape inserts. The study investigated the influence of twisted ratio on thermodynamic regulation and mechanism in the corrugated tube. The results indicate that Nusselt number in the corrugated tube (Nu(c)) exceeds those in the corrugated tube and smooth tube by 120-136% and 171-317%, respectively. Meanwhile, the friction factor increases by 148-153% and 476-514%, respectively. The best overall thermal performance (eta = 1.97) is obtained with a high twist ratio (y/w = 5). However, the highest thermal performance (Nu(c)/Nu(s) = 4.78) is obtained with the lowest twist ratio (y/w = 1.25).
引用
收藏
页码：S577 / S584
页数：8
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