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Enhanced heat conduction in molten salt containing nanoparticles: Insights from molecular dynamics
Li, Zhao1; Cui, Liu1; Li, Baorang1; Du, Xiaoze2
2020-06
Source PublicationINTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
ISSN0017-9310
Volume153
AbstractThe addition of nanoparticles is a promising strategy to manipulate the thermal transport property of molten salt, which is an important thermal energy storage material for concentrating solar power. The molecular dynamics simulations have been conducted to investigate the mechanisms of enhanced heat transfer in binary molten salt based nanocomposite with nonmetallic nanoparticle SiO2. The results show that the thermal conductivity of molten salt is increased by introducing nanoparticles, which is up to 54.5% increase under 10%wt. loading of SiO2 nanoparticle. Moreover, the thermal conductivity increases as the nanoparticle loading rises. To elucidate the underlying mechanisms for the enhancement of thermal conductivity, the mean square displacement and size effect of nanoparticle, the structure and density of the ordered layer were analyzed. It is found that the possible mechanisms, including the Brownian motion of nanoparticle, the micro-convection of base fluid, and the ordered layer at the solid-liquid interface, for enhanced heat transfer proposed in previous literatures cannot explain the change in thermal conductivity of molten salt. The increment in thermal conductivity can be attributed to the improved probability and frequency of ion collision, as evidenced by the change of potential energy. The present findings verify the applicability for the molten salt-nanoparticle composite, moreover, highlight the correlation between the potential energy and the enhancement of thermal conductivity, which may provide guidance on the chosen of materials and design of the molten salt-nanoparticle composite. (C) 2020 Elsevier Ltd. All rights reserved.
KeywordSolar salt Nanoparticle Thermal conductivity Potential energy Molecular dynamics
DOI10.1016/j.ijheatmasstransfer.2020.119578
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[51676069][51806064 and51741604] ; Fundamental Research Funds for the Central Universities[2018QN034]
WOS Research AreaThermodynamics ; Engineering ; Mechanics
WOS SubjectThermodynamics ; Engineering, Mechanical ; Mechanics
WOS IDWOS:000530718200044
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Document Type期刊论文
Identifierhttp://ir.lut.edu.cn/handle/2XXMBERH/76501
Collection兰州理工大学
能源与动力工程学院
Corresponding AuthorCui, Liu; Du, Xiaoze
Affiliation1.North China Elect Power Univ, Minist Educ, Key Lab Power Stn Energy Transfer Convers & Syst, Beijing 102206, Peoples R China
2.Lanzhou Univ Technol, Sch Energy & Power Engn, Lanzhou 730050, Peoples R China
Corresponding Author AffilicationColl Energy & Power Engn
Recommended Citation
GB/T 7714
Li, Zhao,Cui, Liu,Li, Baorang,et al. Enhanced heat conduction in molten salt containing nanoparticles: Insights from molecular dynamics[J]. INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER,2020,153.
APA Li, Zhao,Cui, Liu,Li, Baorang,&Du, Xiaoze.(2020).Enhanced heat conduction in molten salt containing nanoparticles: Insights from molecular dynamics.INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER,153.
MLA Li, Zhao,et al."Enhanced heat conduction in molten salt containing nanoparticles: Insights from molecular dynamics".INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 153(2020).
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