Thermo-hydraulic performance evaluation of turbulent flow and heat transfer in a twisted flat tube: A CFD approach

Case Studies in Thermal Engineering

Misagh ghassabian¹  Hamid Hassanzadeh Afrouzi²  Ahmad N. Abdulfattah³  Mohammadreza Daemiashkezari⁴  Hijaz Ahmad⁵  Mohammad Javad Pour Razzaghi⁶ 

[1]Corresponding author.

[2]Department of Communication and Computer Engineering, Cihan University-Erbil, Erbil, Kurdistan Region, Iraq

[3]Department of Mechanical Engineering, Mashhad Branch, Islamic Azad University, Mashhad, Iran

[4]Department of Mechanical Engineering, University College of Nabi Akram, No.1283 Rah Ahan Street, Tabriz, Iran

[5]Faculty of Mechanical Engineering, Babol Noshirvani University of Technology, Babol, Iran

[6]School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing, 210014, China

关键词: Heat transfer enhancement;    Twisted flat tube;    Swirling flow;    Turbulence flow;    Numerical method;   

DOI  :  

来源: DOAJ

【 摘 要 】

The numerical procedure for turbulence fluid flow and heat transfer in a twisted flat tube is presented in this work. For the cross-section of the flat tube, three different geometries are investigated. Water is a working fluid with constant thermophysical properties. The Reynolds number ranges from 5000 to 20000. Results show that by using twisted flat tubes, the efficiency has increased nearly 70% compared to the smooth tubes with the same surface area and hydraulic diameter. Also, the alternating helical direction has caused almost 60%, which seems to be a good choice. Due to the effect of helical pitch that affects the flow path, the alternating geometry was better in some Reynolds and not others. The results are explained using flow characteristics contours such as turbulent kinetic energy, tangential velocity, and temperature. Moreover, the results are presented in numbers and plots for a more accurate comparison.

【 授权许可】

Unknown