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<p>This study investigates natural convection heat transfer in a ribbed annular cylinder filled with pure water and Al<sub>2</sub>O<sub>3</sub> nanoparticles. The natural convective heat transfer is numerically simulated, considering variable viscosity and thermal conductivity of the Al<sub>2</sub>O<sub>3</sub>-water nanofluid. The flow field and temperature distribution are analyzed by evaluating the effects of volume fraction and Rayleigh number. Typically, Al<sub>2</sub>O<sub>3</sub> nanoparticles significantly influence the Nusselt number, enhancing both the thermal conductivity and viscosity of the fluid. It is observed that for nanoparticle volume fractions of 7%-9%, the effect of volume fraction on heat transfer is minimal in an annulus cylinder without ribs. Heat transfer in the nanofluid improves as the Rayleigh number increases, and the presence of ribs causes a shift in heat transfer enhancement from the upper to the lower region.</p>

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Thermal analysis of Al2O3-water nanofluid within a ribbed enclosure

  • 期刊论文

  • 发表日期：

    2025年11月5日

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  • Zenglu Song,
  • Liang Luo,
  • Longfei Wang,
  • Xin Wan,
  • Dan Zheng,
  • Gongnan Xie,
  • Jin Wang

摘要

This study investigates natural convection heat transfer in a ribbed annular cylinder filled with pure water and Al2O3 nanoparticles. The natural convective heat transfer is numerically simulated, considering variable viscosity and thermal conductivity of the Al2O3-water nanofluid. The flow field and temperature distribution are analyzed by evaluating the effects of volume fraction and Rayleigh number. Typically, Al2O3 nanoparticles significantly influence the Nusselt number, enhancing both the thermal conductivity and viscosity of the fluid. It is observed that for nanoparticle volume fractions of 7%-9%, the effect of volume fraction on heat transfer is minimal in an annulus cylinder without ribs. Heat transfer in the nanofluid improves as the Rayleigh number increases, and the presence of ribs causes a shift in heat transfer enhancement from the upper to the lower region.