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Thermal conductivity of high temperature fluoride molten salt determined by laser flash technique

机译：激光闪光技术测定高温氟化物熔盐的导热系数

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摘要

The thermal conductivity of high temperature liquid fluoride salt was measured by laser flash technique for the first time. A graphite crucible was specially designed to exclude the dissolved gas and avoid overflowing of molten salt, meanwhile, a special treat process was used for preparing homogeneous sample. The combined model is feasible for data analysis. The reliability of laser flash method involving crucible structure, sample preparation and data analysis is verified by distilled water and pure KNO_3 molten salt. Further, the thermal diffusivity of 46.5 mol%LiF-l 1.5 mol%NaF-42 mol%KF (FLiNaK) molten salt is determined to be 1.64 × 10~(-3)-2.48 × 10~(-3) cm~2/s at the temperature range of 773-973 K with the blanket atmosphere of helium. Based on specific heat capacity determined by differential scanning calorimetry (DSC) as a constant of 1.88 ± 0.08 J/gK and density measured by our group, the thermal conductivity of FLiNaK molten salt is calculated to be 0.652-0.927 W/m K with the uncertainty of ±0.023 W/m K in the temperature range of 773-973 K.
机译：首次通过激光闪光技术测量了高温液态氟化物盐的热导率。专门设计了石墨坩埚，以排除溶解的气体并避免熔融盐溢出，同时，还使用了特殊的处理工艺来制备均质样品。组合模型对数据分析是可行的。通过蒸馏水和纯KNO_3熔融盐验证了涉及坩埚结构，样品制备和数据分析的激光闪光方法的可靠性。此外，确定46.5 mol％LiF-1 1.5 mol％NaF-42 mol％KF（FLiNaK）熔融盐的热扩散率为1.64×10〜（-3）-2.48×10〜（-3）cm〜2 / s，在773-973 K的温度范围内，氦气的覆盖气氛。根据差示扫描量热法（DSC）确定的比热常数（常数为1.88±0.08 J / gK）和我们小组测得的密度，FLiNaK熔融盐的热导率计算为0.652-0.927 W / m K在773-973 K的温度范围内，不确定度为±0.023 W / m K.

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  • 来源
  • 作者

    Xue-Hui An; Jin-Hui Cheng; Hui-Qin Yin; Lei-Dong Xie; Peng Zhang;

  • 作者单位

    Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China;

    Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China;

    Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China,University of Chinese Academy of Sciences, Beijing 100049, China;

    Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China;

    Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, 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

    Fluoride molten salt; Laser flash technique; Thermal conductivity; Specific heat capacity;

    机译：氟化物熔盐;激光闪光技术;导热系数;比热容;

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