多孔骨架内非平衡相间传质特性研究  

Study of the Mass Transfer in Porous Media at Non-equilibrium Conditions

作　　者：王思佳 蒋兰兰[3] 宋永臣[3] 饶中浩 WANG Sijia;JIANG Lanlan;SONG Yongchen;RAO Zhonghao(Hebei Engineering Research Center of Advanced Energy Storage Technology and Equipment,School of Energy and Environmental Engineering,Hebei University of Technology,Tianjin 300401,China;Hebei Key Laboratory of Thermal Science and Energy Clean Utilization,School of Energy and Environmental Engineering,Hebei University of Technology,Tianjin 300401,China;Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]河北工业大学能源与环境工程学院,先进储能技术与装备河北省工程研究中心,天津300401 [2]河北工业大学能源与环境工程学院,河北省热科学与能源清洁利用技术重点实验室,天津300401 [3]大连理工大学海洋能源利用与节能教育部重点实验室,大连116024

出　　处：《工程热物理学报》2025年第2期500-504,共5页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.52176092);天津市教委科研计划项目(No.2023KJ296)。

摘　　要：气–液相间扩散传输与对流混合等传热传质行为广泛存在于相变储能、储氢或地质碳封存等过程,而多孔骨架内多组分流体相间扩散系数与对流混合速度的预测,及传质强化机制仍存在困难。本文探究了多孔骨架内气–液相间扩散-对流传质特性。考虑注入溶液的弥散性带来的影响改进了工作方程,发现两种线性分子气体在水相溶液的扩散系数差异取决于溶质的有效尺寸。温度是影响气液相间扩散的主导因素,扩散系数几乎与压力无关,这与溶剂的低压缩性一致。进一步通过核磁信号表征了对流溶解的四个发展历程,发现对流溶解速率相较于扩散溶解速率高出1~2个数量级。The physical processes of heat and mass transfer,including the diffusion of gases and liquids across interfaces and the mixing caused by convection,are extensively employed in various applications such as energy storage through phase-change,hydrogen storage,and geologic carbon sequestration.However,accurately predicting the diffusion coefficients and mixing rates of multiplecomponent fluids within porous structures,as well as understanding the mechanisms that enhance mass transfer,continues to present challenges.This work examines the mass transfer properties of gas-liquid phases in porous skeletons,specifically focusing on diffusion-convection dynamics.The equations used for calculations were enhanced to incorporate the effect of the dispersion of the injected solution.It was found that the disparity in the diffusion coefficients of the two linear molecular gases in the solution present in the water phase was contingent upon the effective size of the solute.The diffusion between the gas-liquid phases is mostly influenced by temperature,and the diffusion coefficients are nearly unaffected by pressure,which fits with the solvent's low compressibility.The four manifestations of convective dissolution are additionally identified by NMR signals,revealing that the rate of convective dissolution is one to two orders of magnitude greater in comparison to the rate of diffusive dissolution.

关 键 词：多相流 多孔骨架 扩散特性 对流传质 

分 类 号：TK019[动力工程及工程热物理]