十二醇-癸酸-纳米粒子复合相变材料传热性能

doi:10.11949/j.issn.0438-1157.20151968

摘要/Abstract

摘要：

针对有机相变材料热导率低的共性,以质量比为58.47:41.53的脂肪烃类低共熔有机物十二醇(DA)-癸酸(CA)为基液,添加纳米粒子MWNT、Cu、Al₂O₃及分散剂SDBS制备出纳米复合相变材料,从纳米粒子种类、添加浓度及超声时间方面研究其对复合有机相变材料热物性的影响。实验发现MWNT、Cu、Al₂O₃的添加都可以不同程度上提高DA-CA的热导率。当超声时间为50min、纳米粒子浓度均为0.1g·L^-1时3种纳米复合材料的热导率大小依次是:MWNT>Al₂O₃>Cu。最优例:超声分散时间90min,DA-CA+MWNT(0.1g·L^-1)+SDBS(0.2g·L^-1)的热导率最大,为0.3602W·m^-1·K^-1,相较DA-CA提高了20.5%,在不影响基液热物性的基础上具有良好的热稳定性。

关键词: 复合材料, 纳米粒子, 有机化合物, 热导率, 热物性

Abstract:

To increase the thermal conductivity of organic phase change materials, the nanoparticles with high thermal conductivity, including multi-walled carbon nano-tubes (MWNTs), Cu and Al₂O₃, were added into the organic composite PCMs of lauryl alcohol-capric acid (with mass ratio of 58.47:41.53), respectively. The thermal conductivity coefficients of nano-organic composite PCMs were analyzed. The kinds and concentration of nanoparticles and the time of ultrasonic dispersion were the key influencing factors. The results showed that the thermal conductivity increased in different degree when the different mass fractions of MWNTs, Cu and Al₂O₃ were added. The thermal conductivity enhancement effects were in order of MWNTs, Al₂O₃ and Cu when mass fraction was 0.1 g·L^-1 and ultrasonic dispersion time was 50 min. With the same kind of nanoparticles and ultrasonic dispersion time, the thermal conductivity enhancement effects were decreased as mass fraction was increased from 0.1 g·L^-1 to 0.6 g·L^-1. Excellently, compared with the original PCMs, the thermal conductivity increased by 20.5% when mass fraction of MWNTs was 0.1 g·L^-1 and ultrasonic dispersion time was 90 min. The lauryl alcohol-capric acid+MWNTs (0.1 g·L^-1) + sodium dodecyl bezene sulfonate (0.2 g·L^-1) with good thermal stability had a limited influence on the phase change temperature of the original PCMs and decreased the degree of supercooling by 58.7%.

Key words: composite materials, nanoparticles, organic compounds, thermal conductivity coefficient, thermal properties

中图分类号:

TK02

黄艳, 章学来. 十二醇-癸酸-纳米粒子复合相变材料传热性能[J]. 化工学报, 2016, 67(6): 2271-2276.

HUANG Yan, ZHANG Xuelai. Heat transfer property of lauryl alcohol-capric acid-nanoparticle composite phase change materials[J]. CIESC Journal, 2016, 67(6): 2271-2276.

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