Impact of NAPL architecture on interphase mass transfer: A pore network study |
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| Institution: | 1. Institute of Applied Geosciences, Berlin Institute of Technology, Sekr. BH 3-2, Ernst-Reuter-Platz 1, 10587 Berlin, Germany;2. Institute of Environmental Sciences, Bogazici University, 34342 Bebek, Istanbul, Turkey\n;1. CSIRO Land and Water, Private Bag No. 5, Wembley WA 6913, Australia;2. School of Engineering, Edith Cowan University, 270 Joondalup Drive, Joondalup, WA 6027, Australia;3. School of Earth and Environment, The University of Western Australia, 35 Stirling Highway Crawley, WA 6009, Australia;1. Department of Civil Engineering, Bannari Amman Institute of Technology, Sathyamangalam, Erode, India;2. CSIRO Land and Water, Private Bag No. 5, Wembley, WA 6913, Australia;3. School of Earth and Environment, The University of Western Australia, Nedlands, WA, Australia;4. Environmental and Water Resources Engineering Division, Department of Civil Engineering, Indian Institute of Technology, Madras, India;5. Petroleum Engineering Program, Department of Ocean Engineering, Indian Institute of Technology, Madras, India;6. Department of Chemical Engineering, Indian Institute of Technology, Madras, India;1. Geoscience Research and Applications Group, Sandia National Laboratories, Albuquerque, NM 87185, United States;2. John and Willie Leone Family Department of Energy and Mineral Engineering and EMS Energy Institute, The Pennsylvania State University, University Park, PA 16802, United States;1. Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA 70803, USA;2. Department of Petroleum Engineering, Louisiana State University, Baton Rouge, LA 70803, USA;1. School of Petroleum Engineering, UNSW, Sydney, Australia;2. Department of Petroleum Engineering, Shahid Bahonar University of Kerman, Kerman, Iran |
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| Abstract: | Interphase mass transfer in porous media is commonly modeled using Sherwood number expressions that are developed in terms of fluid and porous medium properties averaged over some representative elementary volume (REV). In this work the influence of sub-grid scale properties on interphase mass transfer was investigated using a two-dimensional pore network model. The focus was on assessing the impact of (i) NAPL saturation, (ii) interfacial area (iii) NAPL spatial distribution at the pore scale, (iv) grain size heterogeneity, (v) REV or domain size and (vi) pore scale heterogeneity of the porous media on interphase mass transfer. Variability of both the mass transfer coefficient that explicitly accounts for the interfacial area and the mass transfer coefficient that lumps the interfacial area was examined. It was shown that pore scale NAPL distribution and its orientation relative to the flow direction have significant impact on flow bypassing and the interphase mass transfer coefficient. This results in a complex non-linear relationship between interfacial area and the REV-based interphase mass transfer rate. Hence, explicitly accounting for the interfacial area does not eliminate the uncertainty of the mass transfer coefficient. It was also shown that, even for explicitly defined flow patterns, changing the domain size over which the mass transfer process is defined influences the extent of NAPL bypassing and dilution and, consequently, the interphase mass transfer. It was also demonstrated that the spatial variability of pore scale parameters such as pore throat diameters may result in different rates of interphase mass transfer even for the same pore size distribution index. |
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