EN添加纳米SiO2对三元混合熔盐比热容和导热率的影响研究
添加纳米SiO2对三元混合熔盐比热容和导热率的影响研究
- 太阳能学报 2025年46卷第6期 页码：9-18
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DOI：doi:10.19912/j.0254-0096.tynxb.2024-2094
中图分类号： TK512-
网络出版：2025-07-07，
纸质出版：2025
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宝光, 吴玉庭, 张灿灿, 等. 添加纳米SiO2对三元混合熔盐比热容和导热率的影响研究[J]. 太阳能学报, 2025,46(6):9-18.
宝光, 吴玉庭, 张灿灿, et al. 添加纳米SiO2对三元混合熔盐比热容和导热率的影响研究[J]. 2025, 46(6): 9-18.
宝光, 吴玉庭, 张灿灿, 等. 添加纳米SiO2对三元混合熔盐比热容和导热率的影响研究[J]. 太阳能学报, 2025,46(6):9-18. DOI： doi:10.19912/j.0254-0096.tynxb.2024-2094.
宝光, 吴玉庭, 张灿灿, et al. 添加纳米SiO2对三元混合熔盐比热容和导热率的影响研究[J]. 2025, 46(6): 9-18. DOI： doi:10.19912/j.0254-0096.tynxb.2024-2094.
摘要
通过高温熔融-机械搅拌制备方法
将20 nm SiO2纳米颗粒均匀分散到三元混合熔盐（KNO3-NaNO2-Na2CO3）中
制备含有不同质量分数SiO2纳米颗粒（0.1%、0.5%、1.0%、1.5%、2.0%）的熔盐纳米流体
以研究SiO2纳米颗粒添加量对熔融盐比热容和导热率的影响。采用同步热分析仪和激光热导率仪测试并分析三元混合熔盐及熔盐纳米流体的比热容和导热率
使用扫描电镜（SEM）对样品的微观结构进行观察和分析。实验表明
当SiO2纳米颗粒质量分数为1.0%时
熔盐纳米流体的平均比热容达到2.09 J/（g·K）
平均导热率达到1.073 W/（m·K）
相较于三元混合熔盐分别提高29.6%和97.9%
这归因于三元混合熔盐表面形成的高密度网状结构
该网状结构拥有较高的比表面积和高表面能
进而可增强熔融盐的比热容和导热率。
Abstract
Using the high-temperature melting-mechanical stirring preparation method
20 nm SiO nanoparticles were uniformly dispersed into a ternary mixed molten salt （KNO-NaNO-NaCO） to prepare molten salt nanofluids containing different mass fractions of SiO nanoparticles （0.1%
0.5%
1.0%
1.5%
2.0%）
in order to investigate the effect of the SiO nanoparticle content on the specific heat capacity and thermal conductivity of the molten salt. A synchronous thermal analyzer and a laser thermal conductivity meter were employed to test and analyze the specific heat capacity and thermal conductivity of both the ternary mixed molten salt and the molten salt nanofluids. Scanning electron microscopy （SEM） was utilized to observe and analyze the microstructure of the samples. The experimental results demonstrate that when the mass fraction of SiO nanoparticles is 1.0%
the average specific heat capacity of the molten salt nanofluid reaches 2.09 J/（g·K）
and the average thermal conductivity reaches 1.073 W/（m·K）
representing increases of 29.6% and 97.9%
respectively
compared to the ternary mixed molten salt. This enhancement is attributed to the formation of a high-density network structure on the surface of the ternary mixed molten salt
which possesses a high specific surface area and surface energy
thereby improving the specific heat and thermal conductivity of the molten salt.
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