| Popis: |
Both nonlinear phenomenon and heat transfer are important topics in physics. However, there has not been a mature subject called "nonlinear thermotics" like its counterpart in optics or acoustics. This review focuses on recent advances in designing thermal metamaterials with temperature response of nonlinear materials, namely, thermal conductivity depending directly on the temperature or variable thermal resistance due to thermal deformation, under the framework of macroscopic heat conduction governed by the Fourier′s law. Nonlinear transformation theory, the scattering cancellation method and effective medium for nonlinear conductive materials were discussed, and some related functional devices for flexible manipulation of heat transfer were designed and fabricated based on these methods, including intelligent thermal metamaterials, macroscopic thermal diodes, energy-free thermostats and thermal bi-stability devices. The findings can provide a reference for the development of "nonlinear thermotics". |
