摘要
通过引入平均修正系数修正Fick第二扩散定律得到了描述分形多孔介质气体非稳态扩散的理论方程。基于'塞状流'扩散实验法建立了分形多孔介质非稳态扩散实验系统,对3个孔隙结构不同的分形多孔介质样品进行了非稳态扩散实验,通过实验对理论方程进行验证和修正。结果表明,Fick第二扩散定律不适用于分形多孔介质中气体非稳态扩散,分形多孔介质中气体非稳态扩散存在一定规律,且多孔介质孔隙结构不同其扩散规律不同。
An average modified coefficient was used to modify Fick＇s second law and a theoretical equation was established to describe unsteady state gas diffusion in fractal porous media.The experimental system for unsteady state gas diffusion in fractal porous media was based on the plug flow diffusion.Three different porous medium samples were used to verify and modify the theoretical equation.The results indicate that Fick＇s second law is not applicable to unsteady state diffusion in fractal porous media,and unsteady state diffusion law in porous media is same under different conditions,and diffusion law in porous media with different pore structures is different.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2013年第9期3139-3144,共6页
CIESC Journal
基金
国家自然科学基金项目(51176096)~~
关键词
多孔介质
非稳态扩散
分形
孔隙结构
porous media
unsteady state diffusion
fractal
pore structure
