Tunable Thermal Rectification and Negative Differential Thermal Resistance in Gas-Filled Nanostructure with Mechanically-Controllable Nanopillars

作     者：LI Fan LI Haiyang WANG Jun XIA Guodong HWANG Gisuk LI Fan;LI Haiyang;WANG Jun;XIA Guodong;HWANG Gisuk

作者机构：MOE Key Laboratory of Enhanced Heat Transfer and Energy ConservationBeijing Key Laboratory of Heat Transfer and Energy ConversionBeijing University of TechnologyBeijing 100124China Department of Mechanical EngineeringWichita State University Wichita KS 67260USA 

出 版 物：《Journal of Thermal Science》 (热科学学报（英文版）)

年 卷 期：2022年第31卷第4期

页      面：1084-1093页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 0703[理学-化学] 0702[理学-物理学] 

基　　金：the National Natural Science Foundation of China(grants Nos.51976002 and 51776007) Beijing Nova Program of Science and Technology(No.Z191100001119033) the Young Talent Project of Beijing Municipal Education Committee(No.CIT&TCD201904015)。 

主　　题：thermal rectification negative differential thermal resistance kinetic theory nanopillars 

摘      要：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.