Thermal Diodes Based on Fractal Structures with Tunable Thermal Threshold

The asymmetry of heat conduction in thermal diodes is attributed to the regulation logic circuits, control devices, etc. Currently, rectification however, are constrained by either specific on/off switching thresholds, or low sensitivity manufacturing errors, as well restrictions for roughness and material characteristics. Here, a diode based on fractal structures (inverted tapered branch channel, 5.7 mm length, 4 branches) with liquid metal/insulator interface proposed avoid these existing constraints. coefficient reaches 0.4704 (16.43 times larger than that basic structures) when filling fraction only increases 1.33 times. maximum temperature difference optimized 18.31 °C heating 80 °C. By different arrangements two mounted chambers’ surfaces, interior temperatures range from 16.06 52.34 same ambient conditions (23.49 °C), indicating excellent effect diodes. These controlled chambers can be applied greenhouses cold chain storage more combinations higher degree thermal-threshold tunability offer possibilities solving complicated management problems promote energy utilization efficiency.