Scholarlink

<p>This study explores the free convection flow and heat transfer of a fluid containing nano-encapsulated phase change nanoparticles (NEPCM) in a square cavity with three different cases of hot and cold walls. The core–shell particles integrate a phase-change material (PCM) can absorb and release latent heat during solid–liquid transitions. The horizontal walls of the cavity are thermally insulated, while the vertical walls are subjected to differential temperature conditions, inducing natural fluid circulation. To assess the thermal efficiency of the system, several configurations of thermal boundary conditions were compared. The governing equations for conservation of mass, momentum and energy were formulated in dimensionless form and solved numerically using the finite element method. The results are presented to show the impact of various parameters which ranged as Rayleigh number (10<sup>3</sup> ≤ Ra ≤ 10<sup>6</sup>), fusion temperature (0.2 ≤ <i>θ</i><sub>f</sub> ≤ 0.6), Stefan number (0.2 ≤ Ste ≤ 0.8), volume fraction of NEPCM particle (0 ≤ <i>ϕ</i> ≤ 0.05). Numerical validation was carried out to ensure the accuracy of the results. The results show that the dimensionless melting temperature (<i>θ</i><sub>f</sub>) is a key parameter in heat transfer enhancement, it was found also that NEPCM particles significantly enhance natural convection heat exchange. On the other hand, the best performance is achieved when the hot and cold walls are vertically aligned. At Ra = 10<sup>6</sup>, adding 5% NEPCM increases the average Nusselt number by 11.5%. This study highlights the potential of NEPCMs to enhance thermal performance in natural convection systems and energy storage capacity.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Natural convection enhancement with nano-encapsulated phase change materials in differentially heated square cavities

  • 期刊论文

  • 发表日期：

    2025年11月28日

查看全文
  • Issa El Glili,
  • Youness Foukhari,
  • Hafsa Akkaoui,
  • Mohamed Sammouda,
  • Mohamed Driouich,
  • Soufiane Belhouideg

摘要

This study explores the free convection flow and heat transfer of a fluid containing nano-encapsulated phase change nanoparticles (NEPCM) in a square cavity with three different cases of hot and cold walls. The core–shell particles integrate a phase-change material (PCM) can absorb and release latent heat during solid–liquid transitions. The horizontal walls of the cavity are thermally insulated, while the vertical walls are subjected to differential temperature conditions, inducing natural fluid circulation. To assess the thermal efficiency of the system, several configurations of thermal boundary conditions were compared. The governing equations for conservation of mass, momentum and energy were formulated in dimensionless form and solved numerically using the finite element method. The results are presented to show the impact of various parameters which ranged as Rayleigh number (103 ≤ Ra ≤ 106), fusion temperature (0.2 ≤ θf ≤ 0.6), Stefan number (0.2 ≤ Ste ≤ 0.8), volume fraction of NEPCM particle (0 ≤ ϕ ≤ 0.05). Numerical validation was carried out to ensure the accuracy of the results. The results show that the dimensionless melting temperature (θf) is a key parameter in heat transfer enhancement, it was found also that NEPCM particles significantly enhance natural convection heat exchange. On the other hand, the best performance is achieved when the hot and cold walls are vertically aligned. At Ra = 106, adding 5% NEPCM increases the average Nusselt number by 11.5%. This study highlights the potential of NEPCMs to enhance thermal performance in natural convection systems and energy storage capacity.