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 

机构地区：[1]MOE Key Laboratory of Enhanced Heat Transfer and Energy Conservation,Beijing Key Laboratory of Heat Transfer and Energy Conversion,Beijing University of Technology,Beijing 100124,China [2]Department of Mechanical Engineering,Wichita State University Wichita KS 67260,USA

出　　处：《Journal of Thermal Science》2022年第4期1084-1093,共10页热科学学报（英文版）

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)。

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.

关 键 词：thermal rectification negative differential thermal resistance kinetic theory NANOPILLARS 

分 类 号：TB383.1[一般工业技术—材料科学与工程]