Effect of nanoparticles on surface tension and density of binary nitrate

doi:10.19799/j.cnki.2095-4239.2021.0112

Abstract

Abstract:

To accurately calculate the heat transfer and heat storage capacity of a molten salt nanofluid, SiO₂ nanoparticles were dispersed into a binary nitrate mixture (60% NaNO₃-40% KNO₃) by a high-temperature melting method, and then five molten salt nanofluids with different SiO₂ nanoparticles were prepared. Using the Archimedes method to measure the liquid density and the pulling escape method to measure the liquid surface tension, the experimental stand was improved. The surface tension and density of the five molten salt nanofluids were measured, and the experimental data were fitted to obtain the relationships of density and surface tension of the five molten salt nanofluids with temperature, and the experimental correlations of the density, the surface tension of molten salt nanofluids, and the temperature was obtained. The results demonstrated that the density of the base salt and the molten salt nanofluids decreased with increase in temperature, and the density of the molten salt nanofluids did not significantly change after addition of the SiO₂ nanoparticles. The surface tension of the base salt and the five molten salt nanofluids decreased with increasing temperature. A formation mechanism of molten salt nanofluids was proposed, and an explanation was given for the changes in density and surface tension.

Key words: molten salt nanofluid, density, surface tension, archimedes method, pulling escape method

CLC Number:

TB 321

Yaxuan XIONG, Hui ZHANG, Yuting WU, Yulong DING. Effect of nanoparticles on surface tension and density of binary nitrate[J]. Energy Storage Science and Technology, 2021, 10(4): 1297-1304.

Figures/Tables 12

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熔盐类型	编号	基盐/g	SiO₂纳米颗粒/g
基盐		100.0	—
纳米熔盐	1#	99.9	0.1
	2#	99.7	0.3
	3#	99.5	0.5
	4#	99.3	0.7
	5#	99.0	1.0

熔盐类型	编号	ρ=a-b×10^-4×t		R²
熔盐类型	编号	a	b	R²
基盐		2.10087	6.54121	0.9994
纳米熔盐	1#	2.10360	6.60430	0.9994
	2#	2.09594	6.49333	0.9993
	3#	2.10463	6.66571	0.9995
	4#	2.10082	6.54816	0.9996
	5#	2.09993	6.51679	0.9994

熔盐类型	编号	ρ=a-b×10^-4×t		R²
熔盐类型	编号	a	b	R²
基盐		0.13499	6.25291	0.993
纳米熔盐	1#	0.14081	7.27806	0.995
	2#	0.14588	7.67071	0.996
	3#	0.14169	6.56486	0.994
	4#	0.14593	7.59929	0.996
	5#	0.15239	8.34736	0.991

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