Numerical study on the influencing mechanism of twisted ratio in outward convex corrugated tubes with a twisted tape insert

Thermal Science

Yang Longbin¹  Zhang Qun¹  Han Huaizhi¹  Hu Yiran¹  Yu Ruitian¹ 

[1] Harbin Engineering University, College of Power and Energy Engineering, Harbin, China;

关键词: corrugated tube;    twisted tape insert;    heat transfer enhancement;    numerical simulation;   

DOI  :  10.2298/TSCI170614042H

来源: DOAJ

【 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 corrugatedtube(Nuc)exceedsthoseinthecorrugatedtubeandsmoothtubeby 120-136% and 171-317%, respectively. Meanwhile, the friction factor increases by 148-153% and 476-514%, respectively. The bestoverallthermal performance (h = 1.97) is obtained with a high twist ratio (y/w = 5). However, the highest thermal performance (Nuc/Nus = 4.78) is obtained with the lowest twist ratio (y/w = 1.25).

【 授权许可】

Unknown