Influence of fluctuating heat sources and the subzone rotation strategy on the solid-liquid phase transition process: experimental and numerical studies

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Thermal Sciences Pub Date : 2025-09-08 DOI:10.1016/j.ijthermalsci.2025.110274

Xinyu Huang , Jiantao Xia , Bin Xiao , Xiaohu Yang , Bengt Sundén

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Abstract

The application of the rotation mechanism promotes heat exchange in the phase-change energy storage (PCES) process and improves the temperature non-uniformity at the end. This research proposes a novel type of subzone rotation condition, where different rotational speeds and rotation directions are applied to distinct phase transition regions, and it is implemented in the triple-tube heat storage process. An experimental system is constructed to monitor the temperature of PCM inside the PCES unit connected to the motor for rotation. Cross-comparisons are made with numerical process of PCES under the application of rotation conditions to verify its accuracy. The effect of constant and fluctuating heat sources on this PCES under different subzone rotation conditions is also considered. The comparison results indicate that the fluctuating heat source on overall melting behavior can be ignored, while the subzone rotation condition can improve the negative effect of the difficult-to-melt area. After applying a subzone rotational speed of 0.2 rpm, compared with static energy storage process, the mean PCES rate increased by 299.43 %, while the required time for heat storage completion is reduced by 74.73 %. The novel active enhanced heat exchange method proposed in the research is conducive to the further development of PCES technology.

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波动热源和分区旋转策略对固液相变过程的影响：实验和数值研究

旋转机构的应用促进了相变储能（PCES）过程中的换热，改善了相变储能末端的温度不均匀性。本研究提出了一种新型的分区旋转条件，在不同的相变区域施加不同的旋转速度和旋转方向，并将其实现在三管蓄热过程中。构建了一个实验系统，用于监测PCES单元内部PCM的温度，该单元与电机连接以进行旋转。通过与旋转条件下PCES数值过程的交叉比较，验证了其精度。同时考虑了不同亚区旋转条件下恒定热源和波动热源对PCES的影响。对比结果表明，波动热源对整体熔化行为的影响可以忽略不计，而分区旋转条件可以改善难熔区的负面影响。应用0.2 rpm的分区转速后，与静态蓄能过程相比，平均PCES率提高了299.43%，而完成蓄热所需时间减少了74.73%。本研究提出的新型主动强化换热方法有利于PCES技术的进一步发展。

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

International Journal of Thermal Sciences 工程技术-工程：机械

CiteScore

8.10

自引率

11.10%

发文量

531

审稿时长

55 days

期刊介绍： The International Journal of Thermal Sciences is a journal devoted to the publication of fundamental studies on the physics of transfer processes in general, with an emphasis on thermal aspects and also applied research on various processes, energy systems and the environment. Articles are published in English and French, and are subject to peer review. The fundamental subjects considered within the scope of the journal are: * Heat and relevant mass transfer at all scales (nano, micro and macro) and in all types of material (heterogeneous, composites, biological,...) and fluid flow * Forced, natural or mixed convection in reactive or non-reactive media * Single or multi–phase fluid flow with or without phase change * Near–and far–field radiative heat transfer * Combined modes of heat transfer in complex systems (for example, plasmas, biological, geological,...) * Multiscale modelling The applied research topics include: * Heat exchangers, heat pipes, cooling processes * Transport phenomena taking place in industrial processes (chemical, food and agricultural, metallurgical, space and aeronautical, automobile industries) * Nano–and micro–technology for energy, space, biosystems and devices * Heat transport analysis in advanced systems * Impact of energy–related processes on environment, and emerging energy systems The study of thermophysical properties of materials and fluids, thermal measurement techniques, inverse methods, and the developments of experimental methods are within the scope of the International Journal of Thermal Sciences which also covers the modelling, and numerical methods applied to thermal transfer.