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Experimentally based pore network modeling of NAPL dissolution process in heterogeneous porous media

Khasi, S ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1016/j.jconhyd.2019.103565
  3. Publisher: Elsevier B.V , 2020
  4. Abstract:
  5. Practical designs of non-aqueous phase liquids (NAPLs) remediation strategies require reliable modeling of interphase mass transfer to predict the retraction of NAPL during processes such as dissolution. In this work, the dissolution process of NAPL during two-phase flow in heterogeneous porous media is studied using pore-network modeling and micromodel experiments. A new physical-experimental approach is proposed to enhance the prediction of the dissolution process during modeling of interphase mass transfer. In this regard, the normalized average resident solute concentration is evaluated for describing the dissolution process at pore-level. To incorporate the effect of medium heterogeneities, a new experimental factor is considered for enhancing corner diffusion modeling. In addition, capillary desaturation curves (CDCs) are predicted during hydraulic flow modeling to estimate initial residual NAPL saturation. The developed network model can predict residual NAPL saturations and mass transfer rate coefficient for a NAPL-water system at different injection rates and fluid saturations. The evaluated mass transfer rate coefficients using the proposed physical-experimental approach show a significant improvement compared to either mechanistic or empirical methods. The proposed approach in this study can be attractive for possible applications in commercial simulators of contaminant transport in porous media. © 2019 Elsevier B.V
  6. Keywords:
  7. Heterogeneous porous media ; Interphase mass transfer ; Micromodel experiment ; Pore network modeling ; Forecasting ; Porous materials ; Two phase flow ; Experimental approaches ; Remediation strategies ; Experimental study ; Heterogeneous medium ; Mass transfer ; Nonaqueous phase liquid ; Pollutant transport ; Porous medium ; Remediation ; Analytical parameters ; Capillary desaturation curve ; Concentration (parameter) ; Diffusion ; Dissolution ; Experiment ; Fluid saturation ; Injection ; Intermethod comparison ; Prediction ; Solute ; Transport kinetics ; Porosity ; Solubility ; Solution and solubility ; Theoretical model ; Water flow ; Water pollutant ; Water Movements
  8. Source: Journal of Contaminant Hydrology ; Volume 228 , November , 2020
  9. URL: https://www.sciencedirect.com/science/article/pii/S0169772219302220