An experimental investigation of melting of nanoparticle-enhanced phase change materials (NePCMs) in a bottom-heated vertical cylindrical cavity

被引：110
作者：
Zeng, Yi [1 ]
Fan, Li-Wu [1 ,2 ]
Xiao, Yu-Qi [1 ]
Yu, Zi-Tao [1 ]
Cen, Ke-Fa [2 ]
机构：
[1] Zhejiang Univ, Inst Thermal Sci & Power Syst, Dept Energy Engn, Hangzhou 310027, Zhejiang, Peoples R China
[2] Zhejiang Univ, Dept Energy Engn, State Key Lab Clean Energy Utilizat, Hangzhou 310027, Zhejiang, Peoples R China
来源：
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | 2013年 / 66卷
基金：
中国博士后科学基金; 中国国家自然科学基金;
关键词：
Thermal energy storage; Phase change materials; Carbon nanotubes; Melting; Natural convection; Thermal conductivity; Viscosity; THERMAL-ENERGY STORAGE; CONDUCTIVITY ENHANCEMENT; MELTING/FREEZING CHARACTERISTICS; SUSPENSIONS; BEHAVIOR; ACID;
D O I：
10.1016/j.ijheatmasstransfer.2013.07.022
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
In this paper, we present preliminary results of an experimental investigation of melting of nanoparticle-enhanced phase change materials (NePCMs) in a bottom-heated vertical cylindrical cavity. Multi-walled carbon nanotubes (CNTs) were dispersed in 1-dodeconal to prepare NePCM samples with various loadings (0 wt.%, 1 wt.%, and 2 wt.%). Thermal conductivity and viscosity of the NePCM samples were measured at their liquid phase. It was shown that melting is decelerated in the presence of the CNTs as a result of the dramatically increased viscosity, leading to significant degradation of natural convection during melting. This overweighs the enhanced heat conduction afforded by the increased thermal conductivity. Such competing effect between the enhanced heat conduction and weakened natural convection determines the melting rate of NePCMs. (C) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码：111 / 117
页数：7
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