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A numerical study to show the combined effect of convective and radiative heat transfer of a helical coil inside an inclined cylindrical enclosure has been carried out. For numerical simulations, a finite volume-based computational fluid dynamics solver is utilised for Rayleigh number (Ra) between 104 and 106, inclination angle (α) varying from 0° to 90°, and pitch-rod diameter ratio (p/d) as 1, 1.3, and 2.6. Surface radiative heat transfer is modelled using the surface-to-surface radiative model. The temperature contours and streamlines are graphically illustrated for better visualization of the flow physics. The impact of inclination angle (α) and p/d on average Nusselt number (Nu) and relative strength of convection are discussed in details. It has been observed that the Nu increases with p/d at Ra = 106, whereas it decreases with p/d at Ra = 104. The peak value of Nu is seen at α = 50° for all p/d and Ra because of the maximum velocity effect and minimum preheating effect.

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A Numerical Investigation of Heat Transfer Within a Cylindrical Enclosure Enveloping a Helical Coil

  • 会议论文

  • 发表日期：

    2025年

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  • Gloria Biswal,
  • Subhasisa Rath,
  • Sukanta Kumar Dash

摘要

A numerical study to show the combined effect of convective and radiative heat transfer of a helical coil inside an inclined cylindrical enclosure has been carried out. For numerical simulations, a finite volume-based computational fluid dynamics solver is utilised for Rayleigh number (Ra) between 104 and 106, inclination angle (α) varying from 0° to 90°, and pitch-rod diameter ratio (p/d) as 1, 1.3, and 2.6. Surface radiative heat transfer is modelled using the surface-to-surface radiative model. The temperature contours and streamlines are graphically illustrated for better visualization of the flow physics. The impact of inclination angle (α) and p/d on average Nusselt number (Nu) and relative strength of convection are discussed in details. It has been observed that the Nu increases with p/d at Ra = 106, whereas it decreases with p/d at Ra = 104. The peak value of Nu is seen at α = 50° for all p/d and Ra because of the maximum velocity effect and minimum preheating effect.