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Thermal metadevices with geometrically anisotropic heterogeneous composites

机译：具有几何各向异性异构复合材料的热元素

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摘要

The classical effective medium theory (EMT) provides a powerful tool in designing heterogeneous-composite functional thermal metadevices. But it is usually appropriate for spatially symmetric or geometrically isotropic systems, which limits the flexibility or adjustability in control. Here, we develop a generalized EMT to predict effective thermal conductivities of heterogeneous systems with elliptical (or ellipsoidal) inclusions. With the generalized EMT, omnidirectional thermal invisibility and directional Janus thermal illusion are designed and experimentally demonstrated just by tuning orientations of shape-anisotropy particles. In particular, we try to clarify the respective scopes of the generalized Maxwell-Garnett and Bruggeman theory based on both theoretical interpretations and numerical simulations. Our work may offer a promising fundamental framework and application prototype in elaborating thermal metadevices with asymmetry, irregularity, or anisotropy in configuration.
机译：经典有效的中学理论（EMT）在设计异构复合功能热元等方面提供了一种强大的工具。 但通常适用于空间对称或几何各向同性系统，这限制了控制的灵活性或可调节性。 在这里，我们开发广泛的EMT以预测具有椭圆形（或椭圆形）夹杂物的异质系统的有效热导体。 通过广义EMT，通过调整形状各向异性粒子的调整方向设计和实验证明了全向动态的EMT，设计和实验展示。 特别是，我们试图根据理论解释和数值模拟，澄清广义麦克斯韦尔 - 加内特和Brugmeman理论的各个范围。 我们的工作可以在详细说明具有不对称，不规则性或各向异性的阐述热元素中提供有前途的基本框架和应用原型。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第8期|121312.1-121312.11|共11页
  • 作者

    Boyan Tian; Jun Wang; Gaole Dai; Xiaoping Ouyang; Jiping Huang;

  • 作者单位

    Department of Physics State Key Laboratory of Surface Physics and Key Laboratory of Micro and Nano Photonic Structures (MOE) Fudan University Shanghai 200433 China;

    Department of Physics State Key Laboratory of Surface Physics and Key Laboratory of Micro and Nano Photonic Structures (MOE) Fudan University Shanghai 200433 China;

    School of Sciences Nantong University Nanwng 226019 China;

    School of Materials Science and Engineering Xiangtan University Xiangtan 411105 China;

    Department of Physics State Key Laboratory of Surface Physics and Key Laboratory of Micro and Nano Photonic Structures (MOE) Fudan University Shanghai 200433 China;

  • 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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