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Automatic method for estimation of in situ effective contact angle from X-ray micro tomography images of two-phase flow in porous media.pdf

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Automatic method for estimation of in situ effective contact angle from X-ray micro tomography images of two-phase flow in porous media.pdf

Journal of Colloid and Interface Science 496 (2017) 51–59Contents lists available at ScienceDirect Journal of Colloid and Interface Science journal homepage: www.elsevier .com/locate / jc isAutomatic method for estimation of in situ effective contact angle from X-ray micro tomography images of two-phase flow in porous media/10.1016/j.jcis.2017.02.005 0021-9797/Crown Copyright 2017 Published by Elsevier Inc. This is an open access article under the CC BY-NC-ND license (/licenses/by-nc-nd/4.0/). Abbreviations: micro-CT, micro computed tomography; 2D, 3D, two-three dimensional; USBM, United States Bureau of Mines; SEM, ESEM, scanning electron microscopy, environmental SEM; ML, maximum likelihood; RMSE/RMSD, root mean square error/difference; ROI, region of interest. ? Corresponding author at: Politecnico di Milano, Dipartimento di Ingegneria Civile e Ambientale, Piazza Leonardo da Vinci 32, 20133 Milan, Italy.Alessio Scanziani a,b,?, Kamaljit Singh b, Martin J. Blunt a,b, Alberto Guadagnini a,c a Politecnico di Milano, Dipartimento di Ingegneria Civile e Ambientale, Piazza Leonardo da Vinci 32, 20133 Milan, Italy b Imperial College London, Department of Earth Science and Engineering, London SW7 2AZ, UK cUniversity of Arizona, Department of Hydrology and Atmospheric Science, Tucson, AZ 85721, USA g r a p h i c a l a b s t r a c ta r t i c l e i n f o Article history: Received 2 December 2016 Revised 4 February 2017 Accepted 6 February 2017 Available online 8 February 2017 Keywords: Contact angle Multiphase flow Porous media Wettability Micro-CT imaginga b s t r a c t Multiphase flow in porous media is strongly influenced by the wettability of the system, which affects the arrangement of the interfaces of different phases residing in the pores. We present a method for estimat- ing the effective contact angle, which quantifies the wettability and controls the local capillary pressure within the complex pore space of natural rock samples, based on the physical constraint