Melting performance enhancement of FHD carreau non-Newtonian PCM in porous media: A geometrical evaluation

IF 1.1 4区工程技术 Q4 THERMODYNAMICS

Thermal Science Pub Date : 2023-01-01 DOI:10.2298/tsci210912016t

M. Talebzadegan, M. Moravej, E. Assareh, M. Izadi

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Abstract

In this paper melting of a carreau non-Newtonian phase change material in the space between two concentric horizontal tubes, which is partially filled with porous material with different shapes but same area, is investigated numerically. A magnetic source is located in the center of the geometry for melting process of phase change material to occur in the presence of ferrohydrodynamic effects. Porous material is made of Cu that covers the cross section of the inner tube. In addition, the space between inner and outer tubes is saturated with paraffin-wax phase change material. Flow of melted paraffin-wax is considered as a carreau non-Newtonian, laminar and incompressible flow with viscous dissipation that is evaluated in a specific time interval. Boussinesq approximation is valid for the phase change material. Also local thermal equilibrium condition is assumed between the porous and the phase change materials. Galerkin finite element method (GFEM) has been utilized to solve the problem. Results showed that melting rate is higher for the third model in comparison to other models. Also Effects of the magnetic number depends on the shape of the porous medium. Therefore, that increase in the magnetic number, increasingly enhances the progress of the melting front in the second case. Moreover, effects of carreau index, Stefan number and porosity on the melting process are studied.

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非牛顿PCM在多孔介质中熔炼性能的增强:几何评价

本文用数值方法研究了一种非牛顿相变材料在两根同心水平管内部分填充形状不同但面积相同的多孔材料时的熔化过程。磁源位于几何形状的中心，使相变材料的熔化过程在铁水动力作用下发生。多孔材料由Cu制成，覆盖在内管的横截面上。此外，内外管之间的空间充满了石蜡相变材料。将熔融石蜡的流动视为一种非牛顿流、层流和不可压缩流，并在特定的时间间隔内对其粘性耗散进行评估。Boussinesq近似对相变材料是有效的。同时假定多孔材料与相变材料之间存在局部热平衡条件。采用伽辽金有限元法(GFEM)求解该问题。结果表明，与其他模型相比，第三种模型的熔化速率更高。磁数的影响也取决于多孔介质的形状。因此，在第二种情况下，磁数的增加，越来越多地促进了熔化锋的进展。此外，还研究了卡罗指数、斯蒂芬数和孔隙率对熔炼过程的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Thermal Science 工程技术-热力学

CiteScore

2.70

自引率

29.40%

发文量

399

审稿时长

5 months

期刊介绍： The main aims of Thermal Science to publish papers giving results of the fundamental and applied research in different, but closely connected fields: fluid mechanics (mainly turbulent flows), heat transfer, mass transfer, combustion and chemical processes in single, and specifically in multi-phase and multi-component flows in high-temperature chemically reacting flows processes present in thermal engineering, energy generating or consuming equipment, process and chemical engineering equipment and devices, ecological engineering, The important characteristic of the journal is the orientation to the fundamental results of the investigations of different physical and chemical processes, always jointly present in real conditions, and their mutual influence. To publish papers written by experts from different fields: mechanical engineering, chemical engineering, fluid dynamics, thermodynamics and related fields. To inform international scientific community about the recent, and most prominent fundamental results achieved in the South-East European region, and particularly in Serbia, and - vice versa - to inform the scientific community from South-East European Region about recent fundamental and applied scientific achievements in developed countries, serving as a basis for technology development. To achieve international standards of the published papers, by the engagement of experts from different countries in the International Advisory board.