Lei Zhang , Hamed Kazemi-Varnamkhasti , Ali Basem , Hussein Hamza , Abbas J. Sultan , Mohammed Al-Bahrani , Celin Padilla , Shoira Bobonazarovna Formanova , Soheil Salahshour , A. Alizadeh
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They are considered to be one of the most promising particles in this application. This research is a case study free convection of nano-encapsulated Phase Change Materials (nePCM) slurry with a volume fraction of 5% and a polyurethane shell and n-nonadecane core in a rectangular chamber was homogeneously simulated and investigated. The temperature of the left wall remains consistent and there are three fins present to enhance the transfer of heat. The governing equations are transformed into dimensionless form and solved numerically using OpenFOAM software. Various parameters such as fin geometry, chamber angle, Rayleigh number, and melting point temperature are altered to assess their impact on velocity profile components, temperature distribution, Cr contours, Nusselt number, and fin efficiency. 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引用次数: 0
摘要
向可再生能源的过渡在很大程度上依赖于电池和储能设备,使其成为当代的一项关键技术。电池对温度的敏感性一直是该技术发展过程中面临的挑战。在这些系统中,热管理、通过冷却创造均匀的温度和适当的热传导非常关键。由于 nePCM 在相变过程中具有显著的潜热,因此在储能和冷却系统中越来越受欢迎。这是因为纳米封装相变材料正得到广泛应用。它们被认为是这一应用中最有前途的颗粒之一。本研究是对体积分数为 5%、外壳为聚氨酯、内核为正壬烷的纳米胶囊相变材料(nePCM)浆料在矩形室中的自由对流进行了均匀模拟和研究。左壁的温度保持一致,并有三个鳍片用于加强热量传递。调节方程被转换为无量纲形式,并使用 OpenFOAM 软件进行数值求解。改变翅片几何形状、腔室角度、瑞利数和熔点温度等各种参数,以评估它们对速度剖面成分、温度分布、Cr 等值线、努塞尔特数和翅片效率的影响。根据研究结果,与 I 型鳍片相比,Y 型和 T 型鳍片几何形状在 Ra = 100 时可将水-新 PCM 流体的效率提高约 10%,在 Ra = 104 时提高约 26%。此外,将雷利数从 Ra = 100 提高到 Ra = 104,在每种翅片几何形状中,水-nePCM 纳米流体的平均努塞尔特数都能提高约 100%。
Improving the thermal performance of nano-encapsulated phase change material slurry by changing fins configurations in a rectangular cavity
The transition to renewable energy is heavily reliant on batteries and energy storage devices, making them a crucial technology of the modern era. The sensitivity of batteries to temperature has been a constant challenge in the development of this technology. Thermal management, creating uniform temperature and proper heat transfer by cooling is very critical in these systems. The popularity of nePCMs is increasing in energy storage and cooling systems due to their remarkable latent heat during phase change. This is because nano-encapsulated phase change materials are being widely used. They are considered to be one of the most promising particles in this application. This research is a case study free convection of nano-encapsulated Phase Change Materials (nePCM) slurry with a volume fraction of 5% and a polyurethane shell and n-nonadecane core in a rectangular chamber was homogeneously simulated and investigated. The temperature of the left wall remains consistent and there are three fins present to enhance the transfer of heat. The governing equations are transformed into dimensionless form and solved numerically using OpenFOAM software. Various parameters such as fin geometry, chamber angle, Rayleigh number, and melting point temperature are altered to assess their impact on velocity profile components, temperature distribution, Cr contours, Nusselt number, and fin efficiency. Based on the results, Y-shape and T-shape fin geometries can increase the efficiency of water-nePCM fluid by about 10% for Ra = 100 and about 26 % for Ra = 104 compared to I-shape fin. Also, increasing the Rayleigh number from Ra = 100 to Ra = 104 improves the average Nusselt number for water-nePCM nanofluids by about 100 % in each of the fin geometries.
期刊介绍:
International Communications in Heat and Mass Transfer serves as a world forum for the rapid dissemination of new ideas, new measurement techniques, preliminary findings of ongoing investigations, discussions, and criticisms in the field of heat and mass transfer. Two types of manuscript will be considered for publication: communications (short reports of new work or discussions of work which has already been published) and summaries (abstracts of reports, theses or manuscripts which are too long for publication in full). Together with its companion publication, International Journal of Heat and Mass Transfer, with which it shares the same Board of Editors, this journal is read by research workers and engineers throughout the world.