Xu Guoqiang, Zhang Haochun, Jin Liang, Jin Yan
School of Energy Science and Engineering, Harbin institute of Technology, Harbin 150001, China.
Center of Applied Space Technology and Microgravity (ZARM), University of Bremen, 28359 Bremen, Germany.
Materials (Basel). 2018 Apr 19;11(4):629. doi: 10.3390/ma11040629.
Owing to the utilization of transformation optics, many significant research and development achievements have expanded the applications of illusion devices into thermal fields. However, most of the current studies on relevant thermal illusions used to reshape the thermal fields are dependent of certain pre-designed geometric profiles with complicated conductivity configurations. In this paper, we propose a methodology for designing a new class of thermal source illusion devices for achieving directed thermal diffusions with natural homogeneous media. The employments of the space rotations in the linear transformation processes allow the directed thermal diffusions to be independent of the geometric profiles, and the utilization of natural homogeneous media improve the feasibility. Four schemes, with fewer types of homogeneous media filling the functional regions, are demonstrated in transient states. The expected performances are observed in each scheme. The related performance are analyzed by comparing the thermal distribution characteristics and the illusion effectiveness on the measured lines. The findings obtained in this paper see applications in the development of directed diffusions with minimal thermal loss, used in novel “multi-beam” thermal generation, thermal lenses, solar receivers, and waveguide.
由于变换光学的应用，许多重大的研发成果已将幻象装置的应用扩展到热学领域。然而，目前大多数关于用于重塑热场的相关热幻象的研究依赖于具有复杂电导率配置的某些预先设计的几何轮廓。在本文中，我们提出了一种设计新型热源幻象装置的方法，以在自然均匀介质中实现定向热扩散。线性变换过程中空间旋转的应用使得定向热扩散与几何轮廓无关，并且天然均匀介质的使用提高了可行性。在瞬态状态下展示了四种方案，其中功能区域填充的均匀介质类型较少。在每个方案中都观察到了预期的性能。通过比较测量线上的热分布特性和幻象效果来分析相关性能。本文的研究结果可应用于开发具有最小热损失的定向扩散，用于新型“多束”热生成、热透镜、太阳能接收器和波导。
