Experimental Study on the Molten Salt at Micron Scale during the Melting Process

  • TIAN Ziqian ,
  • LIAO Zhirong ,
  • XU Chao ,
  • FANG Yongzhe ,
  • JIANG Kaijun ,
  • YUAN Mengdi
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  • Key Laboratory of Power Station Energy Transfer Conversion and System, Ministry of Education of China, School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China

网络出版日期: 2024-01-16

基金资助

This work is supported by the National Natural Science Foundation of China (No. 51821004 and No. 51876061).

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023

Experimental Study on the Molten Salt at Micron Scale during the Melting Process

  • TIAN Ziqian ,
  • LIAO Zhirong ,
  • XU Chao ,
  • FANG Yongzhe ,
  • JIANG Kaijun ,
  • YUAN Mengdi
Expand
  • Key Laboratory of Power Station Energy Transfer Conversion and System, Ministry of Education of China, School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China

Online published: 2024-01-16

Supported by

This work is supported by the National Natural Science Foundation of China (No. 51821004 and No. 51876061).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023

摘要

研究熔盐在微米尺度下的熔化过程对于探究固液相变机理至关重要。本文提出了一种新颖的实验装置及实验分析方法,研究了太阳盐在微米尺度下1-10 °C/min三种加热速率下的熔化过程。重点研究了熔盐颗粒的固液相边界形貌结构和相转变动力学。同时,研究了不同加热速率下液体分数、温度和时间之间的关系式。通过可视化实验装置捕捉了固液相边界形貌结构,并获得了非等温相变过程中的瞬时液体体积分数。然后,提出了温度与液体体积分数之间的关联式,揭示了不同加热速率下固液相边界随温度变化的演变规律。此外,通过引入常数 (Va,b),建立了非等温相变动力学方程,并研究了更多动力学参数,如 lgVa,b 和 -lgVa,b/b。结果表明,对于太阳盐,指数 b 对不同加热速率并不敏感,范围为 3-5。然而,加热速率会影响 Va,b 的值,并呈现出正相关关系。此外,通过提出的改进实验测试方法,可以快速预测 1-10 °C/min 范围内不同加热速率下的非等温相转变动力学方程。该研究填补了微米尺度下熔盐固液相转变机理的研究空白,为今后的研究提供了重要指导。

本文引用格式

TIAN Ziqian , LIAO Zhirong , XU Chao , FANG Yongzhe , JIANG Kaijun , YUAN Mengdi . Experimental Study on the Molten Salt at Micron Scale during the Melting Process[J]. 热科学学报, 2024 , 33(1) : 70 -85 . DOI: 10.1007/s11630-023-1880-1

Abstract

The investigation of the melting behaviors of the molten salt at micron scale during the melting process is critical for explaining the solid-liquid phase transition mechanism. In this paper, a novel experimental system and analysis method were proposed to study the melting process with three heating rates in the range of 1–10°C/min of the solar salt at micron scale. The solid-liquid boundary morphology and phase transition kinetics of molten salt particles were focused on. Meanwhile, the correlations between liquid fraction, temperature and time under different heating rates were studied. The solid-liquid boundary morphology was depicted by the visualized experimental set-up, and the instantaneous liquid volume fraction during the non-isothermal phase transition was obtained. Then, the correlation between temperature and liquid volume fraction was proposed to reveal the evolution of the solid-liquid boundary with temperature at different heating rates. Furthermore, the non-isothermal phase transition kinetic equation was established by introducing a constant parameter (Va,b), and more kinetic parameters such as lg Va,b and –lg Va,b/b were studied. The results showed that the exponent b is not sensitive to the heating rate with a range of 3–5 for solar salt particles. However, the heating rate influences the value of Va,b and presents a positive relationship. Besides, the non-isothermal phase transition kinetic equations at different heating rates in the range of 1–10°C/min can be quickly predicted by the proposed improved experimental test method. This study could fill the research insufficiency and provide significant guidance for future research on the solid-liquid transition mechanism of molten salts at micron scale.

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