He Zeqing, Shi Yingli, Shen Yuqing, Shen Zhigang, Zhang Taihua, Zhao Zhao
Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China.
School of Materials and Energy, University of Electronic Science and Technology of China (USETC), Chengdu 610054, China.
Micromachines (Basel). 2022 Aug 16;13(8):1324. doi: 10.3390/mi13081324.
Epidermal electronic systems (EESs) are a representative achievement for utilizing the full advantages of ultra-thin, stretchable and conformal attachment of flexible electronics, and are extremely suitable for integration with human physiological systems, especially in medical hyperthermia. The stretchable heater with stable electrical characteristics and a uniform temperature field is an irreplaceable core component. The inorganic stretchable heater has the advantage of maintaining stable electrical characteristics under tensile deformation. However, the space between the patterned electrodes that provides tensile properties causes uneven distribution of the temperature field. Aiming at improving the temperature distribution uniformity of stretchable thermotherapy electrodes, an orthotropic heat transfer substrate for stretchable heaters is proposed in this paper. An analytical model for transient heat conduction of stretchable rectangular heaters based on orthotropic transfer characteristics is established, which is validated by finite element analysis (FEA). The homogenization effect of orthotropic heat transfer characteristics on temperature distribution and its evolutionary relationship with time are investigated based on this model. This study will provide beneficial help for the temperature distribution homogenization design of stretchable heaters and the exploration of its transient heat transfer mechanism.
表皮电子系统（EESs）是充分利用柔性电子产品超薄、可拉伸和贴合性等优势的一项代表性成果，极其适合与人体生理系统集成，尤其是在医学热疗方面。具有稳定电学特性和均匀温度场的可拉伸加热器是不可替代的核心部件。无机可拉伸加热器具有在拉伸变形下保持稳定电学特性的优点。然而，提供拉伸性能的图案化电极之间的间距会导致温度场分布不均。针对改善可拉伸热疗电极的温度分布均匀性问题，本文提出了一种用于可拉伸加热器的正交各向异性传热基板。建立了基于正交各向异性传热特性的可拉伸矩形加热器瞬态热传导分析模型，并通过有限元分析（FEA）进行了验证。基于该模型研究了正交各向异性传热特性对温度分布的均匀化作用及其随时间的演变关系。本研究将为可拉伸加热器的温度分布均匀化设计及其瞬态传热机理的探索提供有益帮助。
