Experimental and numerical analysis of the heat transfer in a packed bed exposed to the high thermal radiation flux

Ruiz Gustavo; Ripoll Nicolas; Fedorova Nataliia; Zbogar-Basic Ana; Jovicic Vojislav; Delgado Antonio; Toledo Mario

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Experimental and numerical analysis of the heat transfer in a packed bed exposed to the high thermal radiation flux

机译：高热辐射通量下填充床传热的实验和数值分析

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This paper investigates temperature profiles and heat fluxes in a packed bed heated by radiation that simulates solar energy flux. For this purpose, the discrete element method (DEM) was used along a heat transfer model (conduction and radiation mechanism). Short-range model is proposed for considering thermal radiation in a discrete elements system, which represents an easy-to-implement and low-computational-cost alternative. As results of the simulations, thermal profiles through the packed bed were obtained, as well as the accompanying heat flux. Experiments were performed in a packed bed of inert ceramic particles (alumina spheres). A radiant porous burner was placed at the bottom of the packed bed to simulate an imposed concentrated solar heat flux. Numerical results show good agreement with experimental data. In addition, the thermal profiles, obtained by the heat transfer model in DEM, were compared with the results obtained by discretizing the conservation of energy equation of the solid phase using finite differences, showing a correlation between the power and temperatures reached. It is concluded that the radiation model proposed provides the basis to continue with the study of granular materials at high temperature, where radiation is the dominant mechanism. (C) 2019 Elsevier Ltd. All rights reserved.

机译：本文研究模拟辐射的热辐射在填充床中的温度分布和热通量。为此，沿传热模型（传导和辐射机制）使用了离散元素方法（DEM）。提出了一种考虑离散元件系统中热辐射的短程模型，该模型代表了易于实现且计算成本低的替代方案。作为模拟结果，获得了通过填充床的热分布以及伴随的热通量。实验是在惰性陶瓷颗粒（氧化铝球）的填充床中进行的。将辐射多孔燃烧器放置在填充床的底部，以模拟施加的集中太阳热通量。数值结果与实验数据吻合良好。此外，将通过DEM中的传热模型获得的热曲线与通过使用有限差分离散化固相能量方程守恒而获得的结果进行了比较，显示了功率和所达到的温度之间的相关性。结论是，所提出的辐射模型为继续研究高温下的粒状材料提供了基础，而高温是辐射的主要机理。（C）2019 Elsevier Ltd.保留所有权利。

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来源
《International Journal of Heat and Mass Transfer》 |2019年第6期|383-392|共10页
作者
Ruiz Gustavo; Ripoll Nicolas; Fedorova Nataliia; Zbogar-Basic Ana; Jovicic Vojislav; Delgado Antonio; Toledo Mario;
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作者单位

Univ Tecn Federico Santa Maria, Dept Mech Engn, Valparaiso, Chile;

Univ Tecn Federico Santa Maria, Dept Mech Engn, Valparaiso, Chile;

Friedrich Alexander Univ Erlangen Nuremberg, Inst Fluid Mech LSTM, Erlangen, Germany|Erlangen Grad Sch Adv Opt Technol SAOT, Erlangen, Germany;

Friedrich Alexander Univ Erlangen Nuremberg, Inst Fluid Mech LSTM, Erlangen, Germany;

Friedrich Alexander Univ Erlangen Nuremberg, Inst Fluid Mech LSTM, Erlangen, Germany|Erlangen Grad Sch Adv Opt Technol SAOT, Erlangen, Germany;

Friedrich Alexander Univ Erlangen Nuremberg, Inst Fluid Mech LSTM, Erlangen, Germany|Erlangen Grad Sch Adv Opt Technol SAOT, Erlangen, Germany;

Univ Tecn Federico Santa Maria, Dept Mech Engn, Valparaiso, Chile;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种 eng
中图分类
关键词
Packed bed; Discrete element method (DEM); LIGGGHTS; Radiation; Heat transfer;

机译：填充床;离散元法（DEM）;轻度;辐射;传热;

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Experimental and numerical analysis of the heat transfer in a packed bed exposed to the high thermal radiation flux

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