STUDY ON EFFECT OF ADDING NANO-SiO2 ON SPECIFIC HEAT CAPACITY AND THERMAL CONDUCTIVITY OF TERNARY MOLTEN SALT MIXTURE

Bao Guang; Wu Yuting; Zhang Cancan; Lu Yuanwei; Na Heya

doi:10.19912/j.0254-0096.tynxb.2024-2094

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (6) : 9-18. DOI: 10.19912/j.0254-0096.tynxb.2024-2094

Special Topics of Academic Papers at the 27th Annual Meeting of the China Association for Science and Technology

STUDY ON EFFECT OF ADDING NANO-SiO₂ ON SPECIFIC HEAT CAPACITY AND THERMAL CONDUCTIVITY OF TERNARY MOLTEN SALT MIXTURE

Bao Guang, Wu Yuting, Zhang Cancan, Lu Yuanwei, Na Heya

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Abstract

Using the high-temperature melting-mechanical stirring preparation method, 20 nm SiO₂ nanoparticles were uniformly dispersed into a ternary mixed molten salt （KNO₃-NaNO₂-Na₂CO₃） to prepare molten salt nanofluids containing different mass fractions of SiO₂ nanoparticles （0.1%, 0.5%, 1.0%, 1.5%, 2.0%）, in order to investigate the effect of the SiO₂ 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 SiO₂ 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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SiO₂ nanoparticles / specific heat / thermal conductivity / molten salt / nanostructure

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Bao Guang, Wu Yuting, Zhang Cancan, Lu Yuanwei, Na Heya. STUDY ON EFFECT OF ADDING NANO-SiO₂ ON SPECIFIC HEAT CAPACITY AND THERMAL CONDUCTIVITY OF TERNARY MOLTEN SALT MIXTURE[J]. Acta Energiae Solaris Sinica. 2025, 46(6): 9-18 https://doi.org/10.19912/j.0254-0096.tynxb.2024-2094

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