Effect of Elliptical Cylinder Arrangement on Turbulent Flow and Heat Transfer in Horizontal Channels

Document Type : Original Article

Authors
Diyar Azizi 1
Mehrdad Malekzadeh 2
Ramin Ghasemi Asl 3
1 Ph.D. Student, Department of Mechanical Engineering, Islamic Azad University, Tehran, Iran.
2 Assistant Professor, Department of Mechanical Engineering, Islamic Azad University, Tehran, Iran.
3 Associate Professor, Department of Mechanical Engineering, Islamic Azad University, Tehran, Iran.
10.22034/stme.2024.476747.1075
Abstract
In this study, the turbulent flow behavior in a horizontal channel containing elliptical cylinders with aspect ratio 0.45 and 0.5 and Reynolds number 5000 has been studied. Also, by using the finite element method to solve heat and fluid equations, the effect of parameters such as heat transfer rate, Nusselt number, temperature distribution and velocity distribution on fluid flow has been investigated. The results of this study show that the presence of cylinders increases the vortices and changes the flow patterns from symmetrical to asymmetrical. Also, as the Reynolds number increases, the flow becomes increasingly turbulent and the rotating mechanics of the cylinders contribute to a different distribution of temperature and velocity. In the investigation of the flow around elliptical cylinders, it has been observed that the temperature maximum point occurs between the third and fourth cylinders in the case of constant properties and behind the fifth cylinder in the case of variable properties. Also, the fluid velocity has a greater effect on the heat transfer rate than the heat exchange surface. Reducing the aspect ratio leads to a decrease in the amount of heat transfer in the turbulent flow, and the temperature contours in this flow are more uniform, which is due to the mixing and transverse vibrations of the turbulent flow. These findings can help to improve the design of heat transfer and flow control systems in engineering applications.
Keywords
circular cylinders
elliptical cylinders
fluid heat flow
steady and transient flow
vortex
Subjects
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  • Receive Date 03 September 2024
  • Revise Date 20 October 2024
  • Accept Date 26 October 2024
  • First Publish Date 26 October 2024
  • Publish Date 21 September 2024