Li2CO3/Na2CO3/K2CO3及其混合熔融盐储热材料热物性分子动力学研究

杨薛明; 陶嘉伟; 孟凡星; 李春博

doi:10.19912/j.0254-0096.tynxb.2022-0019

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太阳能学报 ›› 2023, Vol. 44 ›› Issue (5) : 48-58. DOI: 10.19912/j.0254-0096.tynxb.2022-0019

Li₂CO₃/Na₂CO₃/K₂CO₃及其混合熔融盐储热材料热物性分子动力学研究

杨薛明, 陶嘉伟, 孟凡星, 李春博

作者信息 +

MOLECULAR DYNAMICS STUDY ON THERMOPHYSICAL PROPERTIES OF Li₂CO₃/Na₂CO₃/K₂CO₃ AND THEIR MIXED MOLTEN SALT FOR HEAT STORAGE

Yang Xueming, Tao Jiawei, Meng Fanxing, Li Chunbo

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文章历史 +

摘要

对Li₂CO₃/Na₂CO₃/K₂CO₃及其二元和三元混合熔融盐的密度、比热容、黏度、热导率进行分子动力学模拟（MD）,对比得出模拟结果与现有的实验数据和模拟值相近。结果表明：随着温度的升高,密度逐渐减小,离子之间的距离增加,导致对剪切应力的抵抗力变小,这说明单组分、二元和三元熔融盐黏度的负温度依赖性。对于熔融盐的热导率,单组分和二元熔融盐也呈现出负温度依赖性,而三元熔融盐趋势是随温度的升高呈上升状态。

Abstract

Molecular dynamics （MD） simulations of density, specific heat capacity, viscosity and thermal conductivity of Li₂CO₃/Na₂CO₃/K₂CO₃ and its binary and ternary mixed molten salts were carried out and compared with the experimental results. The simulation results are in good agreement with the existing experimental data and simulation values. The results show that with the increasing of temperature, the density decreases and the distance between ions increases, which lead to the decrease of resistance to shear stress, indicating the negative temperature dependence of viscosity of the single-component, binary and ternary molten salts. For the thermal conductivity of molten salt, the single-component and the binary molten salt also show a negative temperature dependence, while the ternary molten salt tends to increase with the increase of temperature.

导出引用

杨薛明, 陶嘉伟, 孟凡星, 李春博. Li₂CO₃/Na₂CO₃/K₂CO₃及其混合熔融盐储热材料热物性分子动力学研究[J]. 太阳能学报. 2023, 44(5): 48-58 https://doi.org/10.19912/j.0254-0096.tynxb.2022-0019

Yang Xueming, Tao Jiawei, Meng Fanxing, Li Chunbo. MOLECULAR DYNAMICS STUDY ON THERMOPHYSICAL PROPERTIES OF Li₂CO₃/Na₂CO₃/K₂CO₃ AND THEIR MIXED MOLTEN SALT FOR HEAT STORAGE[J]. Acta Energiae Solaris Sinica. 2023, 44(5): 48-58 https://doi.org/10.19912/j.0254-0096.tynxb.2022-0019

中图分类号： TK512.+4

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