Effect of elliptical cylinder arrangement on turbulent flow and heat transfer in horizontal channels

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Azizi Diyar; Malekzadeh Mehrdad; Ghasemi Asl Ramin

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Journal Paper

Paper Information

Journal: Science and Technology in Mechanical Engineering Year:2024 | Volume:3 | Issue:1 Page(s): 63-78

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Information Journal Paper

Title

Effect of elliptical cylinder arrangement on turbulent flow and heat transfer in horizontal channels

Author(s)

Azizi Diyar | Malekzadeh Mehrdad | Ghasemi Asl Ramin | Issue Writer Certificate

Keywords

Circular cylindersQ4

elliptical cylindersQ4

fluid heat flowQ4

Steady and transient flowQ4

VortexQ4

Abstract

This study investigated the turbulent flow behavior in a horizontal channel containing elliptical cylinders with aspect ratio 0.45 and 0.5 and Reynolds number 5000. 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 show that the presence of cylinders increases the vortices and changes the flow patterns from symmetric to asymmetric. 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 the elliptical cylinders, it was observed that the maximum temperature 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. The reduction of the aspect ratio leads to the reduction of the heat transfer rate in the turbulent flow and the temperature contours are more uniform in this flow, 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.

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