Li Yiyi, Zhang Haochun, Sun Mingyuan, Zhang Zhenhuan, Zhang Haiming
School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China.
Entropy (Basel). 2020 Apr 18;22(4):461. doi: 10.3390/e22040461.
As a typical representative of transformation thermodynamics, which is the counterpart of transformation optics, the thermal cloak has been explored extensively while most current research focuses on the structural design instead of adaptability and practicability in a dynamic environment. The evaluation of energy processes involved in the thermal cloak under dynamic conditions are also lacking, which is essential to the engineering application of this functional structure. In this paper, based on the dynamic environment of a sinusoidal form with ambient amplitude, distribution density, phase, and temperature difference as variables, we evaluated the cloaking performance and environmental response of a 2D thermal cloak. Considering the heat dissipation and energy loss in the whole procedure, local entropy production rate and response entropy were introduced to analyze the different influences of each environmental parameter on the cloaking system. Moreover, we constructed a series of comprehensive schemes to obtain the fitting equation as well as an appropriate scope to apply the thermal cloak. The results are beneficial to the novel use of the concept of entropy and valuable for further improving the working efficiency and potential engineering applications of the thermal cloak.
作为变换热力学的典型代表，变换热力学是变换光学的对应领域，热斗篷已得到广泛研究，然而当前大多数研究集中在结构设计上，而非动态环境中的适应性和实用性。动态条件下热斗篷所涉及的能量过程评估也较为缺乏，而这对于这种功能结构的工程应用至关重要。本文基于以环境振幅、分布密度、相位和温差为变量的正弦形式动态环境，评估了二维热斗篷的隐身性能和环境响应。考虑到整个过程中的散热和能量损失，引入局部熵产生率和响应熵来分析各环境参数对隐身系统的不同影响。此外，我们构建了一系列综合方案以获得拟合方程以及热斗篷适用的合适范围。研究结果有助于熵概念的新颖应用，对于进一步提高热斗篷的工作效率和潜在工程应用具有重要价值。
