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Study on the nucleating agents for gallium to reduce its supercooling

机译：镓的成核试剂研究减少其过冷

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摘要

Gallium, a typical room temperature liquid metal, has high thermal conductivity and large volume fusion enthalpy. These characteristics make it a promising phase change material (PCM). However, the significant supercooling of gallium has obstructed its wide application. Adding nucleating agents is a commonly adopted method to reduce supercooling, while the study of nucleating agents for liquid metal is rarely reported so far. In this paper, the influences of the thermal history and the particle size of nucleating agents on the supercooling of gallium were systematically investigated. After that, several particles, such as TeO_2, CaO, MgO, iron, and copper were selected as nucleating agents for experiments. The lattice constant was found as one of the most important parameters when selecting nucleating agents. In addition, a more favorable wettability of the nucleating agents with gallium also contributed to the restraint of supercooling. The experimental result showed that the addition of TeO_2, whose lattice constant appears as the most similar to that of α-Ga, had the best effect for reducing the supercooling of gallium. The largest reduction of supercooling occurred when 0.5 wt.% TeO_2 was added, and more additions resulted in particle agglomeration and a lower nucleation effect This paper provides important routes for the selection of nucleating agents for gallium, which will benefit for future applications of liquid metal in building heat storage, thermal comfort maintenance and thermal management.
机译：镓，典型的室温液态金属，具有高导热率和大体积融合焓。这些特性使其成为有前途的相变材料（PCM）。然而，镓的显着过冷阻塞了其广泛的应用。添加成核剂是一种常用的减少过冷的方法，而迄今为止则很少报道液态金属的成核试剂的研究。本文系统地研究了热历史和核细胞粒径对镓的过冷的影响。之后，选择几种颗粒，例如TEO_2，CaO，MgO，铁和铜作为实验的成核剂。在选择成核剂时，将晶格常数作为最重要的参数之一。此外，具有镓的成核剂的更有利的润湿性也有助于过冷的约束。实验结果表明，添加TEO_2，其晶格常数出现与α-GA最常见的最常相似，对降低镓的过冷却具有最佳效果。当加入0.5重量％时，加入过冷却量的最大减少。加入更多的TEO_2，导致颗粒附聚并较低的成核效果，本文提供了用于镓的成核剂的重要途径，这将有利于液态金属的未来应用。在建筑蓄热，热舒适维护和热管理。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2020年第2期|119055.1-119055.8|共8页
  • 作者

    Chenglin Zhang; Lei Li; Xiaohu Yang; Jintao Shi; Lin Gui; Jing Liu;

  • 作者单位

    CAS Key Laboratory of Cryogenics Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 China School of Future Technology University of Chinese Academy of Sciences Beijing 100049 China Beijing Key Laboratory of Cryo-Biomedical Engineering Beijing 100190 China;

    CAS Key Laboratory of Cryogenics Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 China Beijing Key Laboratory of Cryo-Biomedical Engineering Beijing 100190 China;

    Science and Technology on Thermal Energy and Power Laboratory Wuhan Second Ship Design and Research Institute Wuhan 430205 China;

    CAS Key Laboratory of Cryogenics Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 China Beijing Key Laboratory of Cryo-Biomedical Engineering Beijing 100190 China;

    CAS Key Laboratory of Cryogenics Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 China School of Future Technology University of Chinese Academy of Sciences Beijing 100049 China Beijing Key Laboratory of Cryo-Biomedical Engineering Beijing 100190 China;

    CAS Key Laboratory of Cryogenics Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 China School of Future Technology University of Chinese Academy of Sciences Beijing 100049 China Department of Biomedical Engineering School of Medicine Tsinghua University Beijing 100084 China Beijing Key Laboratory of Cryo-Biomedical Engineering Beijing 100190 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

    Liquid metal; Gallium; Supercooling; Nucleating agent; Thermal history; Particle size;

    机译：液态金属;镓;过冷;成核剂;热历史;粒子尺寸;

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