The influence of pore size distribution on thermal conductivity,permeability, and phase change behavior of hierarchical porous materials

作     者：LIU XiangLei SONG FangZhou XU Qiao LUO QingYang TIAN Yang LI JiaWei YANG XinMeng JIN Yi LIU XiangLei;SONG FangZhou;XU Qiao;LUO QingYang;TIAN Yang;LI JiaWei;YANG XinMeng;JIN Yi

作者机构：School of Energy and Power EngineeringNanjing University of Aeronautics and AstronauticsNanjing 210016China Key L aboratory of Thermal Management and Energy Utilization of Aviation VehiclesMinistry of Industry and Information Technology'Nanjing 210016China Jiangsu Jinhe Energy Technology Co.Lfd.Zhenjiang 212000China 

出 版 物：《Science China(Technological Sciences)》 (中国科学（技术科学英文版）)

年 卷 期：2021年第64卷第11期

页      面：2485-2494页

核心收录：

学科分类：080702[工学-热能工程] 07[理学] 08[工学] 070205[理学-凝聚态物理] 0807[工学-动力工程及工程热物理] 0714[理学-统计学（可授理学、经济学学位）] 0701[理学-数学] 0702[理学-物理学] 

基　　金：supported by the National Key R&D Program of China(Grant Nos.2018YFA0702300 and 2018YFB1502000) the National Natural Science Foundation of China(Grant Nos.51820105010 and 52076106) the Foundation of the Graduate Innovation Center,Nanjing University of Aeronautics and Astronautics(Grant No.kfjj20200215) support by the Fundamental Research Funds for the Central Universities(Grant No.56XIA17001)。 

主　　题：pore size distribution heat storage performance phase change hierarchical porous materials 

摘      要：Porous foams have been widely employed to improve heat storage rate and prevent leakage of phase change materials(PCMs).Actual porous foams have non-uniform or hierarchical pore size distribution, which is usually neglected in most researches.Here, we establish hierarchical porous models considering different pore size distributions by using Voronoi tessellations. Effects of pore size distribution on thermal conductivity, permeability, and phase change behavior of hierarchical porous foams/PCMs composites are investigated. Uneven pore size distributions are found to decrease the thermal conductivity of porous foams to some extent. On the other hand, the permeability can be reduced by 27.6%, and the heat storage rate can be improved by 7.7% by introducing moderate hierarchy without changing the total porosity. This work opens a new route to enhance heat storage performance of PCMs via leveraging hierarchy of pore size distribution of porous foams.