Pore-scale investigation of wettability impact on residual nonaqueous phase liquid dissolution in natural porous media

Understanding the dissolution behavior of residual nonaqueous phase liquids (NAPLs) in soil and aquifer is essential for remediation activities related prediction models. In this study, impact wettability pore surfaces on NAPL was investigated natural porous media using X-ray microtomography. Three-dimensional pore-scale characteristics blobs were determined water-wet neutral-wet media. Time-resolved images enable to estimate temporal changes saturation interfacial area, then calculate mass transfer coefficient. The results showed that has a significant morphology NAPL; thus, affecting system, are trapped small large pores, resulting uniform distribution higher specific total area. rate faster due area more spatial distribution. Considering as active place, slight effect coefficient independent saturation, whereas lumped decreases significantly during process. Under different flow rates, experimental data Sherwood number Sh modified ' could be well fitted with ~ Re n ′ θ . These because first studied from perspective scale, models will help optimize strategies. • Directly observation Influence behavior. Several empirical correlations liquid-liquid