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Bidirectional and Unidirectional Negative Differential Thermal Resistance Effect in a Modified Lorentz Gas Model
Chinese Physics Letters ( IF 3.5 ) Pub Date : 2021-01-29 , DOI: 10.1088/0256-307x/38/1/016601
Yu Yang , XiuLing Li , Lifa Zhang

Recently, the negative differential thermal resistance effect was discovered in a homojunction made of a negative thermal expansion material, which is very promising for realizing macroscopic thermal transistors. Similar to the Monte Carlo phonon simulation to deal with grain boundaries, we introduce positive temperature-dependent interface thermal resistance in the modified Lorentz gas model and find negative differential thermal resistance effect. In the homojunction, we reproduce a pair of equivalent negative differential thermal resistance effects in different temperature gradient directions. In the heterojunction, we realize the unidirectional negative differential thermal resistance effect, and it is accompanied by the super thermal rectification effect. Using this new way to achieve high-performance thermal devices is a new direction, and will provide extensive reference and guidance for designing thermal devices.



中文翻译:

修正洛伦兹气体模型中的双向和单向负微分热阻效应

最近,在由负热膨胀材料制成的同质结中发现了负微分热阻效应,这对于实现宏观热晶体管非常有希望。与处理晶界的蒙特卡罗声子模拟类似,我们在改进的洛伦兹气体模型中引入了正温度相关界面热阻,并发现了负微分热阻效应。在同质结中,我们再现了一对在不同温度梯度方向上的等效负微分热阻效应。在异质结中,我们实现了单向负微分热阻效应,并伴随着超热整流效应。用这种新方式实现高性能热器件是一个新方向,

更新日期:2021-01-29
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