纳米颗粒对二元硝酸盐表面张力和密度的影响

doi:10.19799/j.cnki.2095-4239.2021.0112

储能科学与技术 ›› 2021, Vol. 10 ›› Issue (4): 1297-1304.doi: 10.19799/j.cnki.2095-4239.2021.0112

纳米颗粒对二元硝酸盐表面张力和密度的影响

熊亚选¹(), 张慧¹, 吴玉庭², 丁玉龙³

^1.北京建筑大学供热供燃气通风及空调工程北京市重点实验室，北京 100044
^2.北京工业大学传热强化与过程节能教育部重点实验室，北京 100124
^3.英国伯明翰大学化工学院，伯明翰 B15 2TT

收稿日期:2021-03-16 修回日期:2021-04-16 出版日期:2021-07-05 发布日期:2021-06-25
通讯作者: 熊亚选 E-mail:xiongyaxuan@bucea.edu.cn
作者简介:熊亚选（1977—），男，博士，教授，主要从事纳米储热材料的研究，E-mail：xiongyaxuan@bucea.edu.cn。
基金资助:
北京市教委科研项目(KM201910016011)

Effect of nanoparticles on surface tension and density of binary nitrate

Yaxuan XIONG¹(), Hui ZHANG¹, Yuting WU², Yulong DING³

^1.Beijing Key Laboratory of Heating, Gas Supply, Ventilation and Air Conditioning, Beijing University of Civil Engineering and Architecture, Beijing 100044, China
^2.Key Laboratory of Enhanced Heat Transfer and Energy Conservation of Ministry of Education, Key Laboratory of Heat Transfer and Energy Conversion of Beijing Municipality, Beijing University of Technology, Beijing 100124, China
^3.School of chemical Engineering, University of Birmingham, Birmingham B15 2TT, UK

Received:2021-03-16 Revised:2021-04-16 Online:2021-07-05 Published:2021-06-25
Contact: Yaxuan XIONG E-mail:xiongyaxuan@bucea.edu.cn

摘要/Abstract

摘要：

为准确计算纳米熔盐的传热储热能力，利用高温熔融法将SiO₂纳米颗粒分散至二元硝酸盐(60%NaNO₃-40%KNO₃)中，制备了5种不同含量SiO₂纳米颗粒的纳米熔盐复合材料。基于阿基米德法测量液体密度和拉筒法测量液体表面张力的原理改进实验装置，搭建高温熔盐密度、表面张力实验台。实验对制备的5种纳米熔盐的表面张力和密度进行实验测量，并对实验数据进行拟合，得到5种纳米熔盐密度和表面张力随温度的变化关系，拟合得到纳米熔盐密度和表面张力与温度之间的实验关联式。结果表明，基盐及5种纳米熔盐的密度均随温度的升高而下降，且加入SiO₂纳米颗粒后，熔融盐的密度变化不明显。基盐及5种纳米熔盐的表面张力也随温度的升高而下降，且加入SiO₂纳米颗粒后，熔融盐的表面张力值均有所增加。提出纳米熔盐形成机理，并对纳米熔盐密度和表面张力改变的原因进行解释。

关键词: 纳米熔融盐, 密度, 表面张力, 阿基米德法, 拉筒法

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

中图分类号:

TB 321

熊亚选, 张慧, 吴玉庭, 丁玉龙. 纳米颗粒对二元硝酸盐表面张力和密度的影响[J]. 储能科学与技术, 2021, 10(4): 1297-1304.

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.

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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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纳米颗粒对二元硝酸盐表面张力和密度的影响

Effect of nanoparticles on surface tension and density of binary nitrate

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