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

Author

Listed:
  • 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)

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.

Suggested Citation

  • Sanghyuk Im & Hyun Woo Cho & Kyeongsoo Kim & Man Yeong Ha & Yong Gap Park, 2023. "Effects of the Wavelength for the Sinusoidal Cylinder and Reynolds Number for Three-Dimensional Mixed Convection," Energies, MDPI, vol. 16(6), pages 1-15, March.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:6:p:2550-:d:1091153
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