Introduction of Asymmetry to Enhance Thermal Transport in Porous Metamaterials at Low Temperature  

作　　者：杨宇 马登科 张力发 Yu Yang;Dengke Ma;Lifa Zhang(Phonon Engineering Research Center of Jiangsu Province,Center for Quantum Transport and Thermal Energy Science,Institute of Physics Frontiers and Interdisciplinary Sciences,School of Physics and Technology,Nanjing Normal University,Nanjing 210023,China)

机构地区：[1]Phonon Engineering Research Center of Jiangsu Province,Center for Quantum Transport and Thermal Energy Science,Institute of Physics Frontiers and Interdisciplinary Sciences,School of Physics and Technology,Nanjing Normal University,Nanjing 210023,China

出　　处：《Chinese Physics Letters》2023年第12期62-67,共6页中国物理快报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 11975125 and 11890703);the Department of Science and Technology of Jiangsu Province (Grant No. BK20220032)。

摘　　要：Introducing porosity with different degrees of disorder has been widely used to regulate thermal properties of materials, which generally results in decrease of thermal conductivity. We investigate the thermal conductivity of porous metamaterials in the ballistic transport region by using the Lorentz gas model. It is found that the introduction of asymmetry and Gaussian disorder into porous metamaterials can lead to a strong enhancement of thermal conductivity. By dividing the transport process into ballistic transport, non-ballistic transport, and unsuccessful transport processes, we find that the enhancement of thermal conductivity originates from the significant increase ballistic transport ratio. The findings enhance the understanding of ballistic thermal transport in porous materials and may facilitate designs of high-performance porous thermal metamaterials.

关 键 词：POROUS TRANSPORT CONDUCTIVITY 

分 类 号：TB383.4[一般工业技术—材料科学与工程]