Department of Physics, State Key Laboratory of Surface Physics, and Key Laboratory of Micro and Nano Photonic Structures (MOE), Fudan University, Shanghai 200433, China.
Phys Rev E. 2019 Feb;99(2-1):022107. doi: 10.1103/PhysRevE.99.022107.
We introduce the phenomenon of golden touch from myth to thermotics. We define golden touch as extending the core property to a shell with an extremely small core fraction. We obtain the requirement of golden touch by making the effective thermal conductivity of the core-shell structure equal to the thermal conductivity of the core. We summarize three types (A, B, and C) of golden touch in two dimensions, and only two types (A and B) of golden touch in three dimensions. We theoretically analyze the distinct properties of different types of golden touch by delicately designing the anisotropic thermal conductivity of the shell. Golden touch is also validated by finite-element simulations which echo the theoretical analyses. Golden touch has potential applications in thermal camouflage, thermal management, etc. Our work not only lays the foundation for golden touch in thermotics, but also provides guidance for exploring golden touch in other diffusive fields like electrostatic and magnetostatic fields.
我们从神话引入了金色触感现象到热学中。我们将金色触感定义为将核心性质扩展到具有极小核心分数的壳层。通过使核壳结构的有效热导率等于核心的热导率，我们获得了金色触感的要求。我们总结了二维中的三种（A、B 和 C）金色触感，以及三维中的两种（A 和 B）金色触感。我们通过巧妙设计壳层的各向异性热导率，对不同类型的金色触感的独特性质进行了理论分析。有限元模拟验证了金色触感，模拟结果与理论分析相呼应。金色触感在热伪装、热管理等方面具有潜在的应用。我们的工作不仅为热学中的金色触感奠定了基础，也为探索静电场和静磁场等其他扩散场中的金色触感提供了指导。
