不同形态体积式太阳能接收器的流动和热行为数值研究

IF 4.4 2区 工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY
Shen Du, Dong Li, MengJie Li, YaLing He
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引用次数: 0

摘要

多孔材料的形态会影响体积式太阳能接收器内的太阳辐射传输、流动和热行为过程。通过对具有各种形态(包括开尔文、韦尔-费兰和泡沫配置)的体积式太阳能接收器进行孔隙尺度数值模拟,开展了一项全面的比较研究。采用理想化单胞和 X 射线计算机断层扫描方法重建孔隙尺度多孔模型。通过蒙特卡洛射线追踪和孔隙尺度数值模拟,阐明了不同受体在不同热边界条件和实际辐照情况下的辐射、流动和热行为。研究结果表明,泡沫结构具有更强的太阳辐射吸收能力,而开尔文和韦尔-菲兰结构则能在非垂直太阳辐照条件下提高穿透深度。与开尔文结构和韦尔-菲兰结构相比,泡沫结构的对流传热效率更高,而韦尔-菲兰结构则表现出明显的热不平衡现象。开尔文和韦尔-菲兰结构的对流传热系数相差约 8.4%。与开尔文和韦尔-菲兰结构相比,泡沫结构在非垂直辐照下表现出更高的热效率和流动阻力,这归因于其较小的孔径和复杂的流道。热效率提高了 1.3%,压降却大幅增加了 32.2%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Numerical investigation on the flow and thermal behaviors of the volumetric solar receivers with different morphologies

Morphologies of the porous materials influence the processes of solar radiation transport, flow, and thermal behaviors within volumetric solar receivers. A comprehensive comparative study is conducted by applying pore scale numerical simulations on volumetric solar receivers featuring various morphologies, including Kelvin, Weaire-Phelan, and foam configurations. The idealized unit cell and X-ray computed tomography scan approaches are employed to reconstruct pore scale porous models. Monte Carlo ray tracing and pore scale numerical simulations are implemented to elucidate the radiative, flow, and thermal behaviors of distinct receivers exposed to varying thermal boundary conditions and real irradiation situations. The findings demonstrate that the foam structure exhibits greater solar radiation absorptivity, while Kelvin and Weaire-Phelan structures enhance the penetration depth under non-perpendicular solar irradiation. In comparison with Kelvin and Weaire-Phelan configurations, the foam structure presents efficient convective heat transfer, with the Weaire-Phelan structure showing pronounced thermal non-equilibrium phenomena. The variance in convective heat transfer coefficient between Kelvin and Weaire-Phelan configurations is approximately 8.4%. The foam structure exhibits higher thermal efficiency and flow resistance under non-perpendicular irradiation compared to Kelvin and Weaire-Phelan structures, attributed to its smaller pore size and intricate flow channels. An increase of 1.3% in thermal efficiency is observed with a substantial rise in pressure drop of 32.2%.

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来源期刊
Science China Technological Sciences
Science China Technological Sciences ENGINEERING, MULTIDISCIPLINARY-MATERIALS SCIENCE, MULTIDISCIPLINARY
CiteScore
8.40
自引率
10.90%
发文量
4380
审稿时长
3.3 months
期刊介绍: Science China Technological Sciences, an academic journal cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China, and published by Science China Press, is committed to publishing high-quality, original results in both basic and applied research. Science China Technological Sciences is published in both print and electronic forms. It is indexed by Science Citation Index. Categories of articles: Reviews summarize representative results and achievements in a particular topic or an area, comment on the current state of research, and advise on the research directions. The author’s own opinion and related discussion is requested. Research papers report on important original results in all areas of technological sciences. Brief reports present short reports in a timely manner of the latest important results.
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