表面特性对含水多孔介质的气体扩散特性的影响

Effect of surface property on diffusion character for porous media with liquid water

为研究多孔介质材料的表面特性即亲水性和疏水性对其含水状态下的扩散特性的影响,基于材料的气孔分布特性,利用材料表面特性不同其液态水充填方式的差异,分析了不同接触角对多孔材料在含水状态下扩散特性的影响。结果表明,不同表面性质的多孔材料其扩散特性差异很大,疏水性多孔介质的渗透性能和扩散性能均低于亲水性多孔介质。

In order to study the effect of the surface property of porous media,such as hydrophilic surface or hydrophobic surface,on diffusion character for porous media with liquid water based on the pore size distribution of porous media and the difference of filling ways of the liquid water causing by surface properties,the difference of diffusion characteristics for porous media with different contact angle under condition that liquid water existing in the pore of porous media were analyzed.The calculation results show that the different surface property will cause obvious difference in the diffusion character for porous media,the permeability and the relative diffusivity of hydrophobic porous medium are lower than that of hydrophilic porous media.Key wrods： porous media;surface property;saturation;relative diffusivity