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首页> 外文期刊>International Journal of Heat and Mass Transfer >Experimental and numerical study of anisotropic thermal conductivity of magnetically aligned PDMS/Ni particle composites
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Experimental and numerical study of anisotropic thermal conductivity of magnetically aligned PDMS/Ni particle composites

机译：磁取向PDMS / Ni颗粒复合材料各向异性导热系数的实验和数值研究

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摘要

In this research, Polydimethylsiloxane (PDMS)ickel (Ni) composites with embedded Ni spherical particle columns were studied for thermal conductivity enhancement. The volume fraction of Ni particles ranged from 2% to 20% while the strength of the applied magnetic field was fixed at 0.45 Tesla. The distribution and morphology of the column structures were quantitatively analyzed using optical microscope, Scanning Electron Microscope (SEM) and digital image processing. A reusable 3ω measurement technique was applied to measure the effective thermal conductivity of PDMS/Ni composites in the parallel direction to the magnetic field. The measured thermal conductivity was compared with the prediction from a finite element model built on the observed microscopic structures. Under a static magnetic field, Ni particles align parallel to the field forming columns. The results illustrated that the diameter of Ni columns increased with increasing particle volume fraction while the center to center spacing between columns did not change substantially under the fixed magnetic strength. The magnetically aligned particle columns significantly enhanced the thermal conductivity of PDMS compared to the randomly distributed particles by about two fold. However, the point contacts between magnetically aligned spherical fillers are the major limiting factor for the further improvement of thermal conductivity.
机译：在这项研究中，研究了具有嵌入式Ni球形颗粒柱的聚二甲基硅氧烷（PDMS）/镍（Ni）复合材料的导热性增强。 Ni颗粒的体积分数在2％至20％的范围内，而施加的磁场的强度固定为0.45特斯拉。使用光学显微镜，扫描电子显微镜（SEM）和数字图像处理对柱结构的分布和形态进行定量分析。应用可重复使用的3ω测量技术来测量PDMS / Ni复合材料在与磁场平行的方向上的有效导热系数。将测得的热导率与基于观察到的微观结构的有限元模型的预测值进行比较。在静磁场下，Ni粒子平行于磁场形成列。结果表明，Ni柱的直径随着颗粒体积分数的增加而增加，而在固定的磁强度下，柱之间的中心间距基本不变。与随机分布的颗粒相比，磁性排列的颗粒柱显着提高了PDMS的热导率约两倍。然而，磁性排列的球形填料之间的点接触是进一步提高导热率的主要限制因素。

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