Nano-PCMs for Electronics Cooling Applications
Nano-PCMs for Electronics Cooling Applications
复制标题
用于电子冷却应用的纳米相变材料
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
O. Manca
中科院分区：
文献类型：
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作者：
L. Colla;L. Fedele;S. Mancin;S. Bobbo;D. Ercole;O. Manca
本工作旨在研究利用氧化铝纳米颗粒来提高纯石蜡的导热性能(导热系数、比热和潜热)，以获得一类新的相变材料，即所谓的纳米相变材料。在熔融温度分别为45℃和55℃的两种石蜡中分别加入0.5%和1.0%的Al_2O_3纳米粒子，得到纳米相变材料。然后测量了比热、潜热和导热系数等热物理性质，以了解纳米颗粒对固体和液体相变材料热物性的影响。此外，还开发并实现了使用纯石蜡和在典型电子被动冷却装置中得到的纳米相变材料的数值比较。建立了相应的数值模型，对相变材料和纳米相变材料的空腔内换热进行了数值模拟。利用有限元分析软件Ansys-FLUENT 15.0进行了数值模拟。报告并讨论了固、液相温度和熔化时间的结果。版权所有*2016 by ASME
The present work aims at investigating a new challenging use of Aluminum Oxide (Al2O3) nanoparticles to enhance the thermal properties (thermal conductivity, specific heat, and latent heat) of pure paraffin waxes to obtain a new class of Phase Change Materials (PCMs), the so-called nano-PCMs. The nano-PCMs were obtained by seeding 0.5 and 1.0 wt% of Al2O3 nanoparticles in two paraffin waxes having melting temperatures of 45 and 55 °C, respectively. The thermophysical properties such as specific heat, latent heat, and thermal conductivity were then measured to understand the effects of the nanoparticles on the thermal properties of both the solid and liquid PCMs. Furthermore, a numerical comparison between the use of the pure paraffin waxes and the nano-PCMs obtained in a typical electronics passive cooling device was developed and implemented. A numerical model is accomplished to simulate the heat transfer inside the cavity either with PCM or nano-PCM. Numerical simulations were carried out using the ANSYS-Fluent 15.0 code. Results in terms of solid and liquid phase temperatures and melting time were reported and discussed.Copyright © 2016 by ASME