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Enhanced heat conduction in molten salt containing nanoparticles: Insights from molecular dynamics

机译：含纳米颗粒的熔融盐中的热传导增强：来自分子动力学的见解

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摘要

The addition of nanoparticles is a promising strategy to manipulate the thermal transport property of molten salt, which is an important thermal energy storage material for concentrating solar power. The molecular dynamics simulations have been conducted to investigate the mechanisms of enhanced heat transfer in binary molten salt based nanocomposite with nonmetallic nanoparticle SiO_2. The results show that the thermal conductivity of molten salt is increased by introducing nanoparticles, which is up to 54.5% increase under 10%wt. loading of SiO_2 nanoparticle. Moreover, the thermal conductivity increases as the nanoparticle loading rises. To elucidate the underlying mechanisms for the enhancement of thermal conductivity, the mean square displacement and size effect of nanoparticle, the structure and density of the ordered layer were analyzed. It is found that the possible mechanisms, including the Brownian motion of nanoparticle, the micro-convection of base fluid, and the ordered layer at the solid-liquid interface, for enhanced heat transfer proposed in previous literatures cannot explain the change in thermal conductivity of molten salt. The increment in thermal conductivity can be attributed to the improved probability and frequency of ion collision, as evidenced by the change of potential energy. The present findings verify the applicability for the molten salt-nanoparticle composite, moreover, highlight the correlation between the potential energy and the enhancement of thermal conductivity, which may provide guidance on the chosen of materials and design of the molten salt-nanoparticle composite.
机译：添加纳米颗粒是操纵熔盐的热传输性的有希望的策略，这是一种用于集中太阳能的重要热储能材料。已经进行了分子动力学模拟，以研究具有非金属纳米颗粒SiO_2的二元熔融盐基纳米复合材料的增强型传热机制。结果表明，通过引入纳米颗粒增加熔融盐的导热率，其高达54.5％以下的10％wt。加载SiO_2纳米粒子。此外，随着纳米颗粒装载升高，导热率增加。为了阐明增强导热系数的潜在机制，分析了纳米颗粒的平均方形位移和尺寸效应，有序层的结构和密度。发现，包括纳米颗粒的褐色运动，基础流体的微对的可能机制，以及固体液体界面处的有序层，以便在先前文献中提出的增强的传热不能解决导热系数的变化熔盐。导热率的增量可以归因于离子碰撞的改善的概率和频率，如潜在能量的变化所证明。本发明研究结果验证了熔融盐纳米粒子复合材料的适用性，突出了势能与导热率的增强之间的相关性，这可以为熔融盐纳米粒子复合材料的材料和设计提供指导。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2020年第6期|119578.1-119578.8|共8页
  • 作者

    Zhao Li; Liu Cui; Baorang Li; Xiaoze Du;

  • 作者单位

    Key Laboratory of Power Station Energy Transfer Conversion and System (North China Electric Power University) Ministry of Education Beijing 102206 China;

    Key Laboratory of Power Station Energy Transfer Conversion and System (North China Electric Power University) Ministry of Education Beijing 102206 China;

    Key Laboratory of Power Station Energy Transfer Conversion and System (North China Electric Power University) Ministry of Education Beijing 102206 China;

    School of Energy and Power Engineering Lanzhou University of Technology Lanzhou 730050 China;

  • 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

    Solar salt; Nanoparticle; Thermal conductivity; Potential energy; Molecular dynamics;

    机译：太阳盐;纳米粒子;导热系数;潜在的能量;分子动力学;

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