Santanu Sinha

• Sinha, Santanu; Roy, Subhadeep & Hansen, Alex (2021). Crack Localization and the Interplay between Stress Enhancement and Thermal Noise. Physica A: Statistical Mechanics and its Applications.  ISSN 0378-4371. . doi: https://doi.org/10.1016/j.physa.2021.125782
• Roy, Subhadeep; Sinha, Santanu & Hansen, Alex (2020). Flow-Area Relations in Immiscible Two-Phase Flow in Porous Media. Frontiers in Physics.  ISSN 2296-424X.  8 . doi: 10.3389/fphy.2020.00004 Full text in Research Archive.
• Sinha, Santanu; Roy, Subhadeep & Hansen, Alex (2020). Phase transitions and correlations in fracture processes where disorder and stress compete. Physical Review Research (PRResearch).  ISSN 2643-1564.  2(4) . doi: https://doi.org/10.1103/PhysRevResearch.2.043108
• Roy, Subhadeep; Hansen, Alex & Sinha, Santanu (2019). Effective rheology of two-phase flow in a capillary fiber bundle model. Frontiers in Physics.  ISSN 2296-424X.  7(JULY) . doi: 10.3389/fphy.2019.00092 Full text in Research Archive.
• Roy, Subhadeep; Sinha, Santanu & Hansen, Alex (2019). Immiscible two-phase flow in porous media: Effective rheology in the continuum limit. arXiv.org.  ISSN 2331-8422. . doi: arXiv:1912.05248
• Sinha, Santanu; Gjennestad, Magnus Aashammer; Vassvik, Morten; Winkler, Mathias; Hansen, Alex & Flekkøy, Eirik Grude (2019). Rheology of high-capillary number two-phase flow in porous media. Frontiers in Physics.  ISSN 2296-424X.  7(65) . doi: 10.3389/fphy.2019.00065 Full text in Research Archive.
• Hansen, Alex; Sinha, Santanu; Bedeaux, Dick; Kjelstrup, Signe; Gjennestad, Magnus Aashammer & Vassvik, Morten (2018). Relations Between Seepage Velocities in Immiscible, Incompressible Two-Phase Flow in Porous Media. Transport in Porous Media.  ISSN 0169-3913.  125(3), s 565- 587 . doi: 10.1007/s11242-018-1139-6
• Savani, Isha; Sinha, Santanu; Hansen, Alex; Bedeaux, Dick; Kjelstrup, Signe & Vassvik, Morten (2017). A Monte Carlo Algorithm for Immiscible Two-Phase Flow in Porous Media. Transport in Porous Media.  ISSN 0169-3913.  116(2), s 869- 888 . doi: 10.1007/s11242-016-0804-x Full text in Research Archive.
• Sinha, Santanu; Bender, Andrew T; Danczyk, Matthew; Keepseagle, Kayla; Prather, Cody A; Bray, Joshua M; Thrane, Linn W; Seymour, Joseph D.; Codd, Sarah L. & Hansen, Alex (2017). Effective Rheology of Two-Phase Flow in Three-Dimensional Porous Media: Experiment and Simulation. Transport in Porous Media.  ISSN 0169-3913.  119(1), s 77- 94 . doi: 10.1007/s11242-017-0874-4
• Flovik, Vegard; Sinha, Santanu & Hansen, Alex (2015). Dynamic Wettability Alteration in Immiscible Two-phase Flow in Porous Media: Effect on Transport Properties and Critical Slowing Down. Frontiers in Physics.  ISSN 2296-424X.  3 . doi: 10.3389/fphy.2015.00086 Full text in Research Archive. Show summary

  The change in contact angles due to the injection of low salinity water or any other wettability altering agent in an oil-rich porous medium is modeled by a network of disordered pores transporting two immiscible fluids. We introduce a dynamic wettability altering mechanism, where the time dependent wetting property of each pore is determined by the cumulative flow of water through it. Simulations are performed to reach steady-state for different possible alterations in the wetting angle (θ). We find that deviation from oil-wet conditions re-mobilizes the stuck clusters and increases the oil fractional flow. However, the rate of increase in the fractional flow depends strongly on θ and as θ → 90°, a critical angle, the system shows critical slowing down which is characterized by two dynamic critical exponents.

• Sinha, Santanu; Kjellstadli, Jonas Tøgersen & Hansen, Alex (2015). Local load-sharing fiber bundle model in higher dimensions. Physical Review E. Statistical, Nonlinear, and Soft Matter Physics.  ISSN 1539-3755.  92:020401(2) . doi: 10.1103/PhysRevE.92.020401
• Erpelding, Marion; Sinha, Santanu; Tallakstad, Ken Tore; Hansen, Alex; Flekkøy, Eirik Grude & Måløy, Knut Jørgen (2013). History independence of steady state in simultaneous two-phase flow through two-dimensional porous media. Physical Review E. Statistical, Nonlinear, and Soft Matter Physics.  ISSN 1539-3755.  88(5) . doi: 10.1103/PhysRevE.88.053004 Show summary

  It is well known that the transient behavior during drainage or imbibition in multiphase flow in porous media strongly depends on the history and initial condition of the system. However, when the steady-state regime is reached and both drainage and imbibition take place at the pore level, the influence of the evolution history and initial preparation is an open question. Here, we present an extensive experimental and numerical work investigating the history dependence of simultaneous steady-state two-phase flow through porous media. Our experimental system consists of a Hele-Shaw cell filled with glass beads which we model numerically by a network of disordered pores transporting two immiscible fluids. From measurements of global pressure evolution, histograms of saturation, and cluster-size distributions, we find that when both phases are flowing through the porous medium, the steady state does not depend on the initial preparation of the system or on the way it has been reached.

• Sinha, Santanu; Hansen, Alex; Bedeaux, Dick & Kjelstrup, Signe (2013). Effective rheology of bubbles moving in a capillary tube. Physical Review E. Statistical, Nonlinear, and Soft Matter Physics.  ISSN 1539-3755.  87(2), s 025001- 5 . doi: 10.1103/PhysRevE.87.025001
• Sinha, Santanu & Hansen, Alex (2012). Effective rheology of immiscible two-phase flow in porous media. Europhysics letters.  ISSN 0295-5075.  99(4) . doi: 10.1209/0295-5075/99/44004
• Sinha, Santanu; Grøva, Morten; Ødegården, Torgeir Bryge; Skjetne, Erik & Hansen, Alex (2011). Local wettability reversal during steady-state two-phase flow in porous media. Physical Review E. Statistical, Nonlinear, and Soft Matter Physics.  ISSN 1539-3755.  84(3), s 037303-1- 037303-4 . doi: 10.1103/PhysRevE.84.037303 Show summary

  We study the effect of local wettability reversal on remobilizing immobile fluid clusters in steady-state two-phase flow in porous media. We consider a two-dimensional network model for a porous medium and introduce a wettability alteration mechanism. A qualitative change in the steady-state flow patterns, destabilizing the percolating and trapped clusters, is observed as the system wettability is varied. When capillary forces are strong, a finite wettability alteration is necessary to move the system from a single-phase to a two-phase flow regime. When both phases are mobile, we find a linear relationship between fractional flow and wettability alteration.

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• Roy, Subhadeep; Sinha, Santanu & Hansen, Alex (2020). Two-phase flow through a porous media: A study in the dynamic pore network model.
• Roy, Subhadeep; Hansen, Alex & Sinha, Santanu (2019). Effective rheology of two-phase flow in porous media: A study in capillary fiber bundle model.
• Roy, Subhadeep; Hansen, Alex & Sinha, Santanu (2019). Effective rheology of two-phase flow in porous media: Dependence on saturation and system disorder.
• Roy, Subhadeep; Sinha, Santanu & Hansen, Alex (2019). Effective rheology of two-phase flow in a porous media: The role of system size and system disorder.
• Roy, Subhadeep; Sinha, Santanu & Hansen, Alex (2019). Effective rheology of two-phase flow in porous media: dependence on system size and system disorder.
• Sinha, Santanu; Gjennestad, Magnus Aashammer; Vassvik, Morten; Winkler, Mathias; Hansen, Alex & Flekkøy, Eirik Grude (2019). Effective Viscosity of Immiscible Two-phase Flow in Porous Media at High Capillary Number.
• Sinha, Santanu; Gjennestad, Magnus Aashammer; Vassvik, Morten; Winkler, Mathias; Hansen, Alex & Flekkøy, Eirik Grude (2019). Immiscible Two-phase Flow in Porous Media: Rheology at High Capillary Number.
• Hansen, Alex; Sinha, Santanu; Bedeaux, Dick; Kjelstrup, Signe; Gjennestad, Magnus Aashammer & Vassvik, Morten (2018). Relations between seepage velocities in immiscible two-phase flow in porous media.
• Sinha, Santanu; Bender, Andrew T; Danczyk, Matthew; Keepseagle, Kayla; Prather, Cody A; Bray, Joshua M; Thrane, Linn W; Seymour, Joseph D.; Codd, Sarah L. & Hansen, Alex (2018). Crossover from linear to non-linear rheological behavior of two-phase flow of Newtonian fluids in porous media.
• Sinha, Santanu & Hansen, Alex (2018). Improving the Monte Carlo Algorithm for Pore-network Simulations of Immiscible Two-Phase Flow in Porous Media.
• Winkler, Mathias; Gjennestad, Magnus Aashammer; Sinha, Santanu & Hansen, Alex (2018). Constitutive Relations for a New Theoretical Framework Describing 2-Phase-Flow in Porous Media.
• Hansen, Alex; Sinha, Santanu; Bedeaux, Dick; Kjelstrup, Signe; Gjennestad, Magnus Aashammer & Vassvik, Morten (2017). Relations between Seepage Velocities in Immiscible, Incompressible Two-Phase Flow in Porous Media,.
• Hansen, Alex; Sinha, Santanu; Bedeaux, Dick; Kjelstrup, Signe; Savani, Isha & Vassvik, Morten (2017). Flow in porous materials - as seen from thermodynamics.
• Savani, Isha; Vassvik, Morten; Sinha, Santanu; Hansen, Alex; Bedeaux, Dick & Kjelstrup, Signe (2015). Two-phase flow in microporous materials: From local to global permeability.

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