Numerical simulation on the melting process of binary chloride salt nanofluids in a square cavity

doi:10.19799/j.cnki.2095-4239.2023.0736

Abstract

Abstract:

Nanoparticles are typically added to molten salt to form nanofluids that enhance the thermophysical properties of heat storage materials. In this study, Fluent software was used to perform numerical simulations of the melting process of binary chloride salt (52NaCl-48CaCl₂, %) and its doped Mg nanofluids in a two-dimensional square cavity. Furthermore, the melting process of the molten salt in a square cavity and the influence of doping nanoparticles on the melting process of molten salt were analyzed. The results revealed that during the melting process of the molten salt and its nanofluids, heat transfer occurred in three stages, namely conduction, natural convection, and conduction. The addition of nanoparticles increased the heat transfer rate of molten salt and reduced the time of melting and phase change processes. The melting times of 1% and 2% Mg nanofluids were reduced by 11.34% and 19.92%, respectively. Furthermore, the solid-liquid transformation time 1% and 2% Mg nanofluids reduced by 33.3% and 43.0%, respectively.

Key words: molten salt, nanofluids, melting, numerical simulation

CLC Number:

TK 513.5

Heqing TIAN, Yiming GAO, Junjie ZHOU. Numerical simulation on the melting process of binary chloride salt nanofluids in a square cavity[J]. Energy Storage Science and Technology, 2024, 13(3): 1030-1035.

Figures/Tables 10

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References 14

1	程进辉. 传蓄热熔盐的热物性研究[D]. 上海: 中国科学院研究生院(上海应用物理研究所), 2014.
	CHENG J H. Study on molten salt thermophysical properties for heat transfer and storage[D]. Shanghai: Shanghai Institute of Applied Physics, Chinese Academy of Sciences, 2014.
2	TIAN H Q, WANG W L, DING J, et al. Preparation of binary eutectic chloride/expanded graphite as high-temperature thermal energy storage materials[J]. Solar Energy Materials and Solar Cells, 2016, 149: 187-194.
3	QIAN T T, LI J H, MIN X, et al. Enhanced thermal conductivity of PEG/diatomite shape-stabilized phase change materials with Ag nanoparticles for thermal energy storage[J]. Journal of Materials Chemistry A, 2015, 3(16): 8526-8536.
4	ZHENG Y, ZHAO W H, SABOL J C, et al. Encapsulated phase change materials for energy storage-Characterization by calorimetry[J]. Solar Energy, 2013, 87: 117-126.
5	BABY R, BALAJI C. Experimental investigations on thermal performance enhancement and effect of orientation on porous matrix filled PCM based heat sink[J]. International Communications in Heat and Mass Transfer, 2013, 46: 27-30.
6	李昭, 李宝让, 崔柳, 等. 高温熔盐基纳米流体热物性的稳定性研究[J]. 储能科学与技术, 2020, 9(6): 1775-1783.
	LI Z, LI B R, CUI L, et al. Stability of the thermal performances of molten salt-based nanofluid[J]. Energy Storage Science and Technology, 2020, 9(6): 1775-1783.
7	CUI L, YU Q S, WEI G S, et al. Mechanisms for thermal conduction in molten salt-based nanofluid[J]. International Journal of Heat and Mass Transfer, 2022, 188: 122648.
8	NARASIMHAN N L, VEERARAGHAVAN V, RAMANATHAN G, et al. Studies on the inward spherical solidification of a phase change material dispersed with macro particles[J]. Journal of Energy Storage, 2018, 15: 158-171.
9	VYSHAK N R, JILANI G. Numerical analysis of latent heat thermal energy storage system[J]. Energy Conversion and Management, 2007, 48(7): 2161-2168.
10	张天福. 高温熔盐罐内熔化过程优化及控制研究[D]. 北京: 华北电力大学, 2021.
	ZHANG T F. Research on optimization and control of melting process in high temperature molten salt[D].Beijing: North China Electric Power University, 2021.
11	廖志荣, 李鑫, 徐超, 等. 太阳能热发电站中熔融盐冻堵管道的熔化过程[J]. 科学通报, 2017, 62(9): 960-966.
	LIAO Z R, LI X, XU C, et al. The melting process of a freezing molten salt pipe of concentracted solar power plant[J]. Chinese Science Bulletin, 2017, 62(9): 960-966.
12	王兴, 靳智平, 刘宏丽. 太阳能熔盐蓄热罐蓄热过程的性能研究[J]. 山西电力, 2015(2): 50-53.
	WANG X, JIN Z P, LIU H L. Study on thermal storage process of solar energy in molten salt thermal storage tank[J]. Shanxi Electric Power, 2015(2): 50-53.
13	HUANG X P, SUN C, CHEN Z Q, et al. Experimental and numerical studies on melting process of phase change materials (PCMs) embedded in open-cells metal foams[J]. International Journal of Thermal Sciences, 2021, 170: 107151.
14	XIAO X, ZHANG P, LI M. Experimental and numerical study of heat transfer performance of nitrate/expanded graphite composite PCM for solar energy storage[J]. Energy Conversion and Management, 2015, 105: 272-284.

物性参数	52NaCl-48CaCl₂	52NaCl-48CaCl₂(1%Mg)	52NaCl-48CaCl₂(2%Mg)
熔化温度/K	773.15	773.15	773.15
熔化焓/(J/kg)	174800	174800	174800

黏度/[kg/(m·s)]	1×10^-8T²-4×10^-5T+0.0275

密度/(kg/m³)	2329.87-0.4696T	2383.17-0.50502T	2456.56-0.55133T

熔盐及其纳米流体	定压比热容/[J/(kg·K)]
熔盐及其纳米流体	520～760 K	＞760 K
52NaCl-48CaCl₂	-7×10^-9T⁵+2×10^-5T⁴-3×10^-2T³+21.8T²-7256.2T+960250.1	1100
52NaCl-48CaCl₂(1%Mg)	9×10^-10T⁴-2×10^-6T³+0.0021T²-0.8855T+138.42	1130
52NaCl-48CaCl₂(1%Mg)	9×10^-10T⁴-2×10^-6T³+0.002T²-0.7819T+116.52	1190

熔盐及其纳米流体	导热系数/[W/(m·K)]
熔盐及其纳米流体	524.5 K	749.5 K	799.2 K	1049.0 K
52NaCl-48CaCl₂	0.46727	0.43974	0.51161	0.58248
52NaCl-48CaCl₂(1%Mg)	0.61873	0.52163	0.61360	0.70643
52NaCl-48CaCl₂(1%Mg)	0.73451	0.56646	0.75319	0.77100

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