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BY 4.0 license Open Access Published by De Gruyter Open Access January 21, 2022

Mixed convection around a circular cylinder in a buoyancy-assisting flow

Hasan Shakir Majdi, Mahmoud A. Mashkour, Laith Jaafer Habeeb and Marko Ilic

Abstract

In this paper, the effect of mixed convection on the flow behavior and heat transfer around a circular cylinder disclosed to a vertically upward laminar air stream is numerically examine. The buoyancy-aided flow is utilized to eliminate and control the vortex shedding of the cylinder. The influence of the Grashof number, 0 ≤ Gr ≤ 6000, the flow and thermal patterns, as well as the local and mean Nusselt number, is investigated at a constant Reynolds number of 100. The unsteady Navier-Stokes’s equations are solved employing a finite-volume method to simulate numerically the velocity and temperature fields in time and space. The results showed periodic instability in the flow and thermal fields for a range of Grashof number Gr ≤ 1300. Also, there is critical value of Grashof number for stopping this instability and the vortex shedding formed behind the cylinder, by the effect of heating. Thus, by increasing Grashof number between 1400 ≤ Gr ≤ 4000, the periodic flow vanishes and converts into steady flow with twin eddies attached to the cylinder from the back. Furthermore, as Grashof number increases behind Gr ≥ 5000, the flow becomes completely attached to the cylinder surface without any separation.

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Received: 2021-10-05
Accepted: 2021-11-29
Published Online: 2022-01-21

© 2022 Hasan Shakir Majdi et al., published by De Gruyter

This work is licensed under the Creative Commons Attribution 4.0 International License.

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