Effects of the Wavelength for the Sinusoidal Cylinder and Reynolds Number for Three-Dimensional Mixed Convection

Sanghyuk Im, Hyun Woo Cho, Kyeongsoo Kim, Man Yeong Ha () and Yong Gap Park ()
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Sanghyuk Im: Research Institute of Medium & Small Shipbuilding, Busan 46757, Republic of Korea
Hyun Woo Cho: Research Institute of Medium & Small Shipbuilding, Busan 46757, Republic of Korea
Kyeongsoo Kim: Research Institute of Medium & Small Shipbuilding, Busan 46757, Republic of Korea
Man Yeong Ha: School of Mechanical Engineering, Pusan National University, Busan 46241, Republic of Korea
Yong Gap Park: College of Mechatronics Engineering, Changwon National University, Changwon 51140, Republic of Korea

Energies, 2023, vol. 16, issue 6, 1-15

Abstract: A numerical study estimated the mixed convection around a sinusoidal cylinder inside a rectangular cavity. The key parameters for sinusoidal circular cylinders were the wavelength and Reynolds number ( Re = 100, 500, and 1000) with a fixed Prandtl number of 0.7. The flow regimes were greatly affected by these parameters. The unsteadiness of the flow pattern was also affected by λ and Re . The results were analyzed by the thermal structure, vortical structure, and Nusselt number. Furthermore, the orthogonal enstrophy was used to quantify the three-dimensional flow characteristics, and the frequency of the surface-averaged Nusselt number for the heated bottom wall was used to analyze the unsteady characteristics. The heat transfer performance was enhanced by 6.6% at Re = 100 for λ = 3 compared to the circular cylinder. In addition, the heat transfer performance was enhanced by 6.6% and 2.6% at Re = 500 for λ = 2 and Re = 1000 for λ = 1, respectively, compared to the circular cylinder.

Keywords: three-dimensional mixed convection; orthogonal enstrophy; sinusoidal cylinder (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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