十四烷纳米流体导热系数影响因素探究  

Exploration on influence factors of thermal conductivity of tetrodecyl nanofluid

作　　者：段远源[1] 吴兴辉[1] 龚玮[1] 吴迪[1] 杨震[1] 

机构地区：[1]清华大学热科学与动力工程教育部重点实验室二氧化碳资源化利用与减排技术北京市重点实验室,北京100084

出　　处：《热科学与技术》2015年第6期431-435,共5页Journal of Thermal Science and Technology

基　　金：国家自然科学基金资助项目(21176133;51321002);清华大学自主科研项目经费资助项目(20131089306)

摘　　要：十四烷是工业中最常用的液态烷烃之一,常被用于有机溶剂,有重要的应用价值。相比于纯烷烃,烷烃基纳米流体具有许多优异的性质,特别是导热系数的增强。采用实验与理论模型对比的方法,对一些影响十四烷基纳米流体导热系数的因素进行研究,包括纳米颗粒种类、浓度、温度以及稳定性。结果表明,纳米流体的有效导热系数随纳米颗粒体积分数的增加而增加,随温度的升高而下降;在各种纳米颗粒中,碳纳米管对导热的增强最为显著,且碳纳米管流体具有最好稳定性。Tetradecane, as one of the most commonly used organic solvent in industry, has important application value. Compared with pure paraffin, paraffin base nanofluids have many excellent properties, especially the enhancement coefficient of thermal conductivity. In this paper, some factors that can increase nanofluid thermal conductivity were studied, including particle type, concentration, temperature and stability. The results of the experiments were compared with the predictions of two theoretical models. The results show that among all the nanoparticles adding carbon nanotubes can significantly increase thermal conductivity of the base fluid. The nanofluid thermal conductivity increases as the nanofluid volume fraction increase and decreases as temperature increases. Among all the nanofluids studied, the carbon nanotube fluid has the best stability and the best thermal conductivity enhancement effect.

关 键 词：十四烷 纳米流体 相变材料 导热系数 稳定性 

分 类 号：TK121[动力工程及工程热物理—工程热物理] TK123[动力工程及工程热物理—热能工程]