储能科学与技术 ›› 2014, Vol. 3 ›› Issue (3): 250-255.doi: 10.3969/j.issn.2095-4239.2014.03.010

• 研究及进展 • 上一篇    下一篇

不同二维纳米填料对复合相变材料导热系数的影响

丁晴1, 方昕1, 范利武1, 徐旭2, 俞自涛1, 胡亚才1   

  1. 1浙江大学热工与动力系统研究所,浙江 杭州 310027;
    2中国计量学院计量测试工程学院,浙江 杭州 310018
  • 收稿日期:2013-09-23 出版日期:2014-05-01 发布日期:2014-05-01
  • 通讯作者: 范利武,E-mail:liwufan@zju.edu.cn.
  • 作者简介:第一作者:丁晴(1989--),女,硕士研究生,从事热物性测试研究,E-mail:ziyoubian888@163.com;
  • 基金资助:
    国家自然科学基金资助项目(51276159,51106144)

Influence of 2-D nanofillers on the thermal conductivity of composite PCMs

DING Qing1, FANG Xin1, FAN Liwu1, XU Xu2, YU Zitao1, HU Yacai1   

  1. 1Institute of Thermal Science and Power Systems,Zhejiang University,Hangzhou 310027,Zhejiang,China;
    2College of Metrological and Measurement Engineering,China Jiliang University,Hangzhou 310018,Zhejiang,China
  • Received:2013-09-23 Online:2014-05-01 Published:2014-05-01

摘要: 为了探究两种不同二维纳米填料对复合相变材料导热系数的影响,分别制备了以石墨烯纳米片和六方氮化硼纳米片为填料的石蜡基复合相变材料.采用瞬态平面热源法在20 ℃时测量了不同添加量下复合相变材料的导热系数.结果显示,石蜡基复合相变材料的导热系数随纳米填料添加量近似线性增长;六方氮化硼纳米片对复合相变材料导热系数的提升远低于石墨烯纳米片.此外,利用基于有效介质模型的预测公式与试验值进行了比较,计算发现形状,大小和导热系数相近的两种纳米材料,六方氮化硼纳米片的界面热阻却高出石墨烯纳米片两个数量级,是后者具有更显著强化效果的原因之一.

关键词: 二维纳米填料, 导热系数, 复合相变材料, 有效介质理论, 界面热阻

Abstract: Paraffin-based composite phase change materials (PCMs) were prepared by using graphene nanoplatelets (GNPs) and boron nitride nanosheets (BNNs). Effective thermal conductivity of the PCM composites in solid state was measured at 20 ℃ using a transient plane source technique. It was shown that the thermal conductivity increased linearly with increasing particle loading for both nanofillers. The thermal conductivity enhancement of the GNPs/paraffin composites was found to be much higher than the BNNs/paraffin composites. The effective medium theory was used to analyse the thermal conductivity of the composites. It was found that, despite of similar shape, size and thermal conductivity of the two nanofillers, the calculated interfacial thermal resistance of BNNs was two orders of magnitude higher than that of GNPs, which explained, at least partially, the observed better performance of the PCM composite containing GNPs.

Key words: 2-D nanofillers, thermal conductivity, composite PCMs, effective medium model, thermal interface resistance

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