摘要
以不同尺寸的BN纳米粒子及自制的BNNTs为添加物,通过两步法制备了不同体积分数的BN(140nm)/EG、BN(70nm)/EG及BNNTs/EG纳米流体,利用瞬态热线装置测试了其热导率,研究了添加物体积分数、长径比、尺寸、聚集形态、流体温度及分散剂等因素对纳米流体热导率的影响规律。结果表明,纳米流体热导率随纳米粒子体积分数、纳米粒子尺寸、纳米粒子长径比、流体温度的增加而增加,纳米粒子松散的链状聚集比紧密的云状聚集更有利于提高基液热导率,分散剂的加入不同程度降低了纳米流体热导率增加量,但降低幅度不大。
Boron nitride/ethylene alcohol（BN/EG） nanofluids and boron nitride nanotubes/ethylene alcohol（BNNTs/EG） nanofluids were synthesized by two-step method.Thermal conductivity of them were measured by transient hot-wire method.The effect such as volume fraction of nanoparticles,aspect ratio of nanoparticles,size of nanoparticles,morphology of nanoparticles＇ aggregation,temperature of nanofluids and the addition of dispersant on thermal conductivity enhancement of BN/EG nanofluids were investigated.The experimental results indicated that the thermal conductivity enhancement of the BN/EG nanofluids increased with the increment of nanoparticles volume fraction,aspect ratio of nanoparticles,size of nanoparticles and temperature of nanofluids.Chain-like loose aggregation of BN nanoparticles was more favourable for thermal conductivity enhancement of BN/EG nanofluids compared to cloud-like compact aggregation of BN nanoparticles.The addition of dispersant decreased the thermal conductivity enhancement of BN/EG nanofluids slightly.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2013年第15期2217-2221,共5页
Journal of Functional Materials
基金
通用汽车公司资助项目(20070311)
