低温相变蓄冷纳米复合流体导热系数实验研究

Experiment Study on Thermal Conductivity of Nanofluids for Cryogenic Cool Storage

在共晶盐BaCl2水溶液中添加亲水性分散剂,经过超声振动制备了粒径为20nm的4种不同体积分数的TiO2-BaCl2-H2O纳米流体。运用瞬态热线法对其进行导热系数的量测。实验表明,加入纳米粒子后可显著提高其导热系数。本文同时分析了温度及粒子体积份数对导热系数的影响。

Four different concentration TiO2-BaCl2-H2O nanofluids with 20nm particle size are prepared by supersonic oscillator through appending hydrophilic dispersant into BaCl2 solution. Thermal conductivity of BaCl2-H2O and nanofiuids are tested by the transient hot-wire method, the experimental results show that thermal conductivity is remarkably increased.The effect of temperature and volume fraction to thermal conductivity is also analysed.