| Affiliation: | 1. School of Mechatronics Engineering, Harbin Institute of Technology, Harbin, 150001 China
Department of Electrical and Computer Engineering, National University of Singapore, Singapore, 117583 Singapore;2. Department of Electrical and Computer Engineering, National University of Singapore, Singapore, 117583 Singapore;3. School of Physics and Innovation Institute, Huazhong University of Science and Technology, Wuhan, 430074 China;4. School of Mechanical Engineering and Automation, Northeastern University, Shenyang, 110819 China;5. School of Mechatronics Engineering, Harbin Institute of Technology, Harbin, 150001 China |
| Abstract: | The emerging thermal metamaterials and metadevices demonstrate significant potential to transform thermal conduction. However, the thermal conductivities of existing devices are all restricted at fixed values if the configuration or constituent materials are static. Thermal convection provides an additional tool to boost and flexibly modify the heat transfer in moving matter, but it is essentially distinct from thermal conduction since the Onsager reciprocity is generally broken in the former but preserved in the latter. Therefore, it is difficult to use convective components for sophisticated control of conductive heat. Here, it is shown that a convective system can be made undistinguishable from a conductive one in principle, by discovering and operating on the reciprocal line of mechanically rotating systems. The realized thermal metadevice can thus mimic a solid-like material whose thermal conductivity dynamically covers a wide range. It offers great possibilities of real-time smooth control over heat transfer for broad applications. |
