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Melting and solidification of PCM enhanced by radial conductive fins and nanoparticles in cylindrical annulus

机译：圆柱形环中的径向导电鳍片和纳米粒子增强了PCM的熔化和凝固

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The main disadvantage of phase change materials (PCM) is related to their low thermal conductivities. In this study, the melting and solidification of a PCM within three various horizontal annulus configurations including two circular cylinders, one elliptical cylinder in a circular cylinder and one finned cylinder in a circular cylinder are investigated numerically in terms of the aspect ratio and the orientation of the ellipse and the number of fins. Different volume fractions of the copper nanoparticles are added to the base PCM to examine the effect of nano-particles on the heat transfer rate. Results indicate natural convection plays important roles in the melting process where the melting rate at the bottom section of the annulus is lower than that at the top section. By using the vertical-oriented tube instead of the circular one the melting rate increases. Adding nanoparticles to the base PCM enhances the melting and solidification rate as well. However, it does not eliminate the stable heat transfer at the bottom section of the annulus. Inserting fins leads to the significant enhancement of the-melting and solidification rate. It is more efficient during the solidification process due to the suppression of the natural convection effect during the melting process. (C) 2016 Elsevier Ltd. All rights reserved.
机译：相变材料（PCM）的主要缺点与它们的低导热率有关。在这项研究中，从纵横比和取向的角度研究了三种不同水平环形结构中PCM的熔化和凝固过程，包括两个圆柱体，一个圆柱体中的一个椭圆形圆柱体和一个圆柱体中的一个翅片圆柱体。椭圆和鳍的数量。将不同体积分数的铜纳米颗粒添加到基础PCM中，以检查纳米颗粒对传热速率的影响。结果表明，自然对流在熔化过程中起着重要作用，其中环空底部的熔化速率低于顶部。通过使用垂直方向的管子而不是圆形的管子，熔化速率会提高。将纳米颗粒添加到基础PCM中还提高了熔融和固化速率。但是，它并不能消除环空底部的稳定传热。插入散热片可显着提高熔融和凝固速率。由于抑制了熔融过程中的自然对流效应，因此在固化过程中效率更高。 （C）2016 Elsevier Ltd.保留所有权利。

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