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Journal of thermal Science 2022年第4期31卷 1084-1093页

作者： LI Fan LI Haiyang WANG Jun XIA Guodong HWANG Gisuk MOE Key Laboratory of Enhanced Heat Transfer and Energy Conservation Beijing Key Laboratory of Heat Transfer and Energy ConversionBeijing University of TechnologyBeijing 100124China Department of Mechanical Engineering Wichita State University Wichita KS 67260USA

In this study,by using the nonequilibrium molecular dynamics and the kinetic theory,we examine the tailored nanoscale thermal transport via a gas-filled nanogap structure with mechanically-controllable nanopillars in one surface only,i.e.,changing nanopillar height.It is found that both the thermal rectification and negative differential thermal resistance(NDTR)effects can be substantially enhanced by controlling the nanopillar height.The maximum thermal rectification ratio can reach 340%and the△T range with NDTR can be significantly enlarged,which can be attributed to the tailored asymmetric thermal resistance via controlled adsorption in height-changing nanopillars,especially at a large temperature difference.These tunable thermal rectification and NDTR mechanisms provide insights for the design of thermal management systems.

关键词： thermal rectification negative differential thermal resistance kinetic theory nanopillars

thermal rectification induced by Wenzel–Cassie wetting state transition on nano-structured solid–liquid interfaces

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Chinese Physics B 2023年第5期32卷 520-526页

作者：李海洋王军夏国栋 MOE Key Laboratory of Enhanced Heat Transfer and Energy Conservation Beijing Key Laboratory of Heat Transfer and Energy ConversionBeijing University of TechnologyBeijing 100124China

thermal rectification refers to the phenomenon by which the magnitude of the heat flux in one direction is much larger than that in the opposite direction.In this study,we propose to implement the thermal rectification phenomenon in an asymmetric solid–liquid–solid sandwiched system with a nano-structured interface.By using the non-equilibrium molecular dynamics simulations,the thermal transport through the solid–liquid–solid system is examined,and the thermal rectification phenomenon can be observed.It is revealed that the thermal rectification effect can be attributed to the significant difference in the interfacial thermal resistance between Cassie and Wenzel states when reversing the temperature bias.In addition,effects of the liquid density,solid–liquid bonding strength and nanostructure size on the thermal rectification are examined.The findings may provide a new way for designs of certain thermal devices.

关键词： thermal rectification wetting transition interfacial thermal resistance solid–liquid interfaces

Enhancement of thermal rectification by asymmetry engineering of thermal conductivity and geometric structure for multi-segment thermal rectifier

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Chinese Physics B 2023年第6期32卷 34-43页

作者：杜甫烨张望王惠琼郑金成 Department of Physics Xiamen UniversityXiamen 361005China Department of Physics Xiamen University Malaysia439000 SepangSelangorMalaysia

thermal rectification is an exotic thermal transport phenomenon,an analog to electrical rectification,in which heat flux along one direction is larger than that in the other direction and is of significant interest in electronic device applications.However,achieving high thermal rectification efficiency or rectification ratio is still a scientific challenge.In this work,we performed a systematic simulation of thermal rectification by considering both efforts of thermal conductivity asymmetry and geometrical asymmetry in a multi-segment thermal rectifier.It is found that the high asymmetry of thermal conductivity and the asymmetry of the geometric structure of multi-segment thermal rectifiers can significantly enhance the thermal rectification,and the combination of both thermal conductivity asymmetry and geometrical asymmetry can further improve thermal rectification efficiency.This work suggests a possible way for improving thermal rectification devices by asymmetry engineering.

关键词： thermal conductivity simulation thermal rectification multi-segment thermal rectifier

Reversal of thermal rectification in one-dimensional nonlinear composite system

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Chinese Physics B 2014年第11期23卷 348-353页

作者：詹斯琦黄维清黄桂芳 Department of Applied Physics Key Laboratory for Micro-Nano Physics and Technology of Hunan Province Hunan University

Using nonequilibrium molecular dynamics simulations, a comprehensive study of the asymmetric heat conduction in the composite system consisting of the Frenkel-Kontorova （FK） model and Fermi-Pasta-Ulam （FPU） model is conducted. The calculated results show that in a larger system, the rectifying direction can be reversed only by adjusting the thermal bias. Moreover, the rectification reversal depends critically on the system size and the properties of the interface. The mechanisms of the two types of asymmetric heat conduction induced by nonlinearity are discussed. Considering the novel asymmetric heat conduction in the system, it may possess possible applications to manage the thermal rectification in situ directionally without re-building the structure.

关键词： thermal rectification reversal nonlinearity composite system

A review of thermal rectification in solid-state devices

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Journal of Semiconductors 2022年第10期43卷 79-96页

作者： Faraz Kaiser Malik Kristel Fobelets Department of Electrical and Electronic Engineering Imperial College LondonSW72BTUnited Kingdom

thermal rectification,or the asymmetric transport of heat along a structure,has recently been investigated as a poten-tial solution to the thermal management issues that accompany the miniaturization of electronic devices.Applications of this concept in thermal logic circuits analogous to existing electronics-based processor logic have also been proposed.This review highlights some of the techniques that have been recently investigated for their potential to induce asymmetric thermal con-ductivity in solid-state structures that are composed of materials of interest to the electronics industry.These rectification ap-proaches are compared in terms of their quantitative performance,as well as the range of practical applications that they would be best suited to.Techniques applicable to a range of length scales,from the continuum regime to quantum dots,are dis-cussed,and where available,experimental findings that build upon numerical simulations or analytical predictions are also high-lighted.

关键词： thermal rectification joule heating solid-state devices

A phononic rectifier based on carbon schwarzite host–guest system

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Chinese Physics B 2020年第12期29卷 50-55页

作者：张忠卫欧阳宇楼陈杰 Sebastian Volz Center for Phononics and thermal Energy Science School of Physics Science and EngineeringTongji UniversityShanghai 200092China China-EU Joint Laboratory for Nanophononics Tongji UniversityShanghai 200092China Institute of Industrial Science The University of TokyoTokyo 153-8505Japan Laboratory for Integrated Micro and Mechatronic Systems CNRS-IIS UMI 2820The University of TokyoTokyo 153-8505Japan

thermal rectification is a promising way to manipulate the heat flow,in which thermal phonons are spectrally and collectively controlled.As phononic devices are mostly relying on monochromatic phonons,in this work we propose a phononic rectifier based on the carbon schwarzite host–guest system.By using molecular dynamic simulations,we demonstrate that the phononic rectification only happens at a specific frequency of the hybridized mode for the host–guest system,due to its strong confinement effect.Moreover,a significant rectification efficiency,~134%,is observed,which is larger than most of the previously observed efficiencies.The study of length and temperature effects on the phononic rectification shows that the monochromaticity and frequency of the rectified thermal phonons depend on the intrinsic anharmonicity of the host–guest system and that the on-center rattling configuration with weak anharmonicity is preferable.Our study provides a new perspective on the rectification of thermal phonons,which would be important for controlling monochromatic thermal phonons in phononic devices.

关键词： thermal rectification phonon thermal transport