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Nano-Phase Change Materials for Electronics Cooling Applications

机译：用于电子冷却应用的纳米相变材料

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摘要

The present work aims at investigating a new challenging use of aluminum oxide (AI_2O_3) 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 % ofAl_20_3 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 fractions and temperatures and melting time were reported and discussed. They showed that the nano-PCMs determine a delay in the melting process with respect to the pure PCMs.
机译：本工作旨在研究新的具有挑战性的氧化铝（AI_2O_3）纳米颗粒的使用方法，以提高纯石蜡的热性能（导热系数，比热和潜热），从而获得新型的相变材料（PCM），所谓的nano-PCM。通过将0.5重量％和1.0重量％的Al_20_3纳米粒子接种在两种熔融温度分别为45和55℃的石蜡中来获得纳米PCM。然后测量热物理性质，例如比热，潜热和热导率，以了解纳米粒子对固态和液态PCM的热性质的影响。此外，开发并实施了纯石蜡的使用与在典型的电子被动冷却装置中获得的纳米PCM之间的数值比较。完成了一个数值模型，以通过PCM或nano-PCM模拟腔体内的热传递。使用ansys-fluent 15.0代码进行了数值模拟。报告并讨论了固相和液相分数，温度和熔融时间方面的结果。他们表明，相对于纯PCM，纳米PCM决定了熔化过程的延迟。

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  • 来源
    《Journal of Heat Transfer》 |2017年第5期|052406.1-052406.9|共9页
  • 作者

    Laura Colla; Davide Ercole; Laura Fedele; Simone Mancin; Oronzio Manca; Sergio Bobbo;

  • 作者单位

    Istituto per le Tecnologie della Costruzione, CNR,Corso Stati Uniti, 4, Padova 35127, Italy;

    Dipartimento di Ingegneria Industriale e dell'lnformazione, Università degli Studi della Campania "Luigi Vanvitelli," Via Roma 29, Aversa 81031, Italy;

    Istituto per le Tecnologie della Costruzione, CNR,Corso Stati Uniti, 4, Padova 35127, Italy;

    Fellow ASME Department of Management and Engineering, University of Padova, Stradeila S. Nicola, 1, Vicenza 36100, Italy;

    Dipartimento di Ingegneria Industriale e dell'lnformazione, Università degli Studi della Campania "Luigi Vanvitelli," Via Roma 29, Aversa 81031, Italy;

    Istituto per le Tecnologie della Costruzione, CNR,Corso Stati Uniti, 4, Padova 35127, Italy;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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