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The present study investigates the unsteady buoyancy-driven convection from a uniformly heated solid cylinder within a square enclosure subjected to a sinusoidal heated bottom wall. The influence of Rayleigh number (Ra), sinusoidal temperature profile wavelength, and the cylinder's varying axial position within the enclosure has been numerically investigated for a 2-dimensional unsteady state framework. The flow and thermal features have been presented in streamlines and isotherms distribution, while a time-averaged Nusselt number \((\overline{Nu}_{t})\) represents the energy transport. The outcomes of the present investigation infer that for higher Ra, the streamlines and isotherms distributions become distorted, whereas the \(\overline{Nu}_{t}\) of the cylinder increases. However, both the flow and thermal features show insignificant variation with changing the wavelength of the imposed temperature on the bottom wall and the axial position of the cylinder.

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Heat Transfer Analysis Driven by Buoyancy from a Heated Cylinder in an Enclosure with Nonuniform Bottom Wall Temperature

  • 会议论文

  • 发表日期：

    2025年

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  • Ankit Chourasia,
  • Dhrijit Kumar Deka,
  • Sukumar Pati

摘要

The present study investigates the unsteady buoyancy-driven convection from a uniformly heated solid cylinder within a square enclosure subjected to a sinusoidal heated bottom wall. The influence of Rayleigh number (Ra), sinusoidal temperature profile wavelength, and the cylinder's varying axial position within the enclosure has been numerically investigated for a 2-dimensional unsteady state framework. The flow and thermal features have been presented in streamlines and isotherms distribution, while a time-averaged Nusselt number \((\overline{Nu}_{t})\) represents the energy transport. The outcomes of the present investigation infer that for higher Ra, the streamlines and isotherms distributions become distorted, whereas the \(\overline{Nu}_{t}\) of the cylinder increases. However, both the flow and thermal features show insignificant variation with changing the wavelength of the imposed temperature on the bottom wall and the axial position of the cylinder.