Thermal characteristic of a turbulent flow through a circular tube fitted with perforated vortex generator inserts

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

2017-07-05

10.1016/j.applthermaleng.2017.03.145

APPLIED THERMAL ENGINEERING   影响因子和分区

1359-4311

A novel type of perforated vortex generators (PVGs) was developed to improve convection heat transfer in the present work. The PVGs were used in the test section with four different perforation indexes of PI= 4%, 8%, 12%, 16% and three relative pitch lengths of p/p(a)= 2, 4, 6. The height to inner tube diameter ratio (e/D) and flow angle of attack (alpha) were kept constant at 0.25 and 45 degrees, respectively. The experiments were conducted in a circular tube in turbulent flow regime with the Reynolds number over the range 3000-21,000 using air as the working fluid under uniform wall heat flux boundary condition. The PVGs were cut from a cone into two identical shapes and attached to the opposite sides of a central rod at specific axial positions. The main findings are that the heat transfer and pressure drop increase with decreasing PI and p/p(a), while thermal enhancement factor (TEF) increases as PI increases. The maximum TEF of 1.65 is achieved by using the PVG at the maximum PI of 16% and the smallest p/p(a) of 2 at Reynolds number of 3000. Correlations of Nusselt number and friction factor for the PVG are also proposed. (C) 2017 Elsevier Ltd. All rights reserved.

Heat exchanger Thermal performance Perforated vortex generator Nusselt number Friction factor

SCI ; EI

英语

第一 ; 通讯

Thermodynamics ; Energy & Fuels ; Engineering ; Mechanics

Thermodynamics ; Energy & Fuels ; Engineering, Mechanical ; Mechanics

WOS:000406169600105

PERGAMON-ELSEVIER SCIENCE LTD

20172003662908

Air ; Angle of attack ; Angle of attack indicators ; Friction ; Heat convection ; Heat exchangers ; Heat flux ; Nusselt number ; Reynolds number ; Turbulent flow ; Vorticity

Heat Exchange Equipment and Components:616.1 ; Fluid Flow, General:631.1 ; Heat Transfer:641.2 ; Aerodynamics, General:651.1 ; Aircraft Instruments and Equipment:652.3 ; Chemical Products Generally:804

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, India

Chamoli, Sunil,Lu, Ruixin,Yu, Peng. Thermal characteristic of a turbulent flow through a circular tube fitted with perforated vortex generator inserts[J]. APPLIED THERMAL ENGINEERING,2017,121:1117-1134.

Chamoli, Sunil,Lu, Ruixin,&Yu, Peng.(2017).Thermal characteristic of a turbulent flow through a circular tube fitted with perforated vortex generator inserts.APPLIED THERMAL ENGINEERING,121,1117-1134.

Chamoli, Sunil,et al."Thermal characteristic of a turbulent flow through a circular tube fitted with perforated vortex generator inserts".APPLIED THERMAL ENGINEERING 121(2017):1117-1134.