Numerical study on flow structure and heat transfer in a circular tube integrated with novel anchor shaped inserts

Chamoli, Sunil1,2; Lu, Ruixin1; Xie, Jin1; Yu, Peng1

2018-05-05

10.1016/j.applthermaleng.2018.02.052

APPLIED THERMAL ENGINEERING   影响因子和分区

1359-4311

This paper reports a numerical study of the thermal performance enhancement of a circular tube embedded with novel anchor-shaped vortex generators. The three-dimensional turbulent periodic flow in the tube subject to a constant heat-flux wall boundary condition is investigated. The fluid flow and heat transfer characteristics are presented for Reynolds number (Re) ranging from 3000 to 18,000. The influences of pitch ratios (PR = P/D = 1, 1.5, 2, and 2.5) and the anchor vortex wing aspect ratios (sigma = b/a = 0.4, 0.6, 0.8,1, and 1.2) on Nusselt Number (Nu), friction factor (/), and the thermal enhancement factor (TEF) are reported. The vortex flow induced by the anchor vortex generator (AVG) inserts leads to a better fluid mixing, thereby accompanied a high heat transfer rate. The results indicate that the presence of AVG inserts elicits a considerable enhancement of Nusselt number and friction factor, which are about 2.24-4.56 and 4.01-23.23 times of those in the corresponding smooth tube, respectively. The maximum TEF of 1.72 is obtained for b/a = 0.4 and P/D = 1 at Re = 3000. These results provide evidence that the AVG insert is a promising device for turbulent convection heat transfer enhancement in a heat exchanger tube.

Anchor vortex generator Numerical study Periodic flow Nusselt number Friction factor Thermal enhancement factor

SCI ; EI

英语

第一 ; 通讯

Thermodynamics ; Energy & Fuels ; Engineering ; Mechanics

Thermodynamics ; Energy & Fuels ; Engineering, Mechanical ; Mechanics

WOS:000432769100031

PERGAMON-ELSEVIER SCIENCE LTD

20181004854694

Aspect ratio ; Friction ; Heat convection ; Heat exchangers ; Heat flux ; Nusselt number ; Reynolds number ; Tribology ; Tubes (components) ; Vorticity

Heat Exchange Equipment and Components:616.1 ; Pipe, Piping and Pipelines:619.1 ; Fluid Flow, General:631.1 ; Heat Transfer:641.2 ; Classical Physics; Quantum Theory; Relativity:931

ENGINEERING

Web of Science

1.Southern Univ Sci & Technol, Dept Mech & Aerosp Engn, Shenzhen 518055, Guangdong, Peoples R China
2.DIT Univ, Dept Mech Engn, Dehra Dun 248009, Uttar Pradesh, India

Chamoli, Sunil,Lu, Ruixin,Xie, Jin,et al. Numerical study on flow structure and heat transfer in a circular tube integrated with novel anchor shaped inserts[J]. APPLIED THERMAL ENGINEERING,2018,135:304-324.

Chamoli, Sunil,Lu, Ruixin,Xie, Jin,&Yu, Peng.(2018).Numerical study on flow structure and heat transfer in a circular tube integrated with novel anchor shaped inserts.APPLIED THERMAL ENGINEERING,135,304-324.

Chamoli, Sunil,et al."Numerical study on flow structure and heat transfer in a circular tube integrated with novel anchor shaped inserts".APPLIED THERMAL ENGINEERING 135(2018):304-324.