二元氯化物熔盐纳米流体在方腔内熔化过程的数值模拟

doi:10.19799/j.cnki.2095-4239.2023.0736

储能科学与技术 ›› 2024, Vol. 13 ›› Issue (3): 1030-1035.doi: 10.19799/j.cnki.2095-4239.2023.0736

二元氯化物熔盐纳米流体在方腔内熔化过程的数值模拟

田禾青(), 高艺明, 周俊杰()

郑州大学机械与动力工程学院，河南郑州 450001

收稿日期:2023-10-19 修回日期:2023-11-15 出版日期:2024-03-28 发布日期:2024-03-28
通讯作者: 周俊杰 E-mail:tianhq@zzu.edu.cn;zhoujj@zzu.edu.cn
作者简介:田禾青（1987—），男，博士，副教授，研究方向为相变储热材料，E-mail：tianhq@zzu.edu.cn；
基金资助:
国家自然科学基金(51906228);河南省博士后基金(202103007)

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

Heqing TIAN(), Yiming GAO, Junjie ZHOU()

School of Mechanical and Power Engineering, Zhengzhou University, Zhengzhou 450001, Henan, China

Received:2023-10-19 Revised:2023-11-15 Online:2024-03-28 Published:2024-03-28
Contact: Junjie ZHOU E-mail:tianhq@zzu.edu.cn;zhoujj@zzu.edu.cn

摘要/Abstract

摘要：

在熔盐中添加微纳颗粒形成纳米流体是一种强化熔盐储热材料热物性的有效方法。本工作利用Fluent软件对二元氯化物熔盐（52NaCl-48CaCl₂，摩尔分数）及其掺杂Mg的纳米流体在二维正方形腔体内的熔化过程进行了数值模拟，分析了熔盐在方腔内的熔化过程以及纳米颗粒的掺杂对腔体内熔盐熔化过程的影响。结果表明，在熔盐及其纳米流体的整个熔化过程中，主要传热形式经历热传导-自然对流-热传导三个阶段。纳米颗粒的掺杂增加了熔盐的传热速率，缩短了熔盐熔化过程所用的时间。与纯二元氯化物熔盐相比，掺杂1%（质量分数）和2%Mg的熔盐纳米流体的熔化时间分别缩短了11.34%和19.92%，固液转变时间分别缩短了33.3%和43.0%。

关键词: 熔盐, 纳米流体, 熔化, 数值模拟

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

中图分类号:

TK 513.5

田禾青, 高艺明, 周俊杰. 二元氯化物熔盐纳米流体在方腔内熔化过程的数值模拟[J]. 储能科学与技术, 2024, 13(3): 1030-1035.

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.

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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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二元氯化物熔盐纳米流体在方腔内熔化过程的数值模拟

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

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