Article
Mechanics
Didier Lasseux, Francisco J. Valdes-Parada
Summary: A closed expression is proposed to calculate the average pressure difference in two-phase flow in porous media. This equation takes into account the pressure gradient, body forces, and interfacial effects in each phase, and is applicable to situations where the fluid-fluid interface is not steady. The accuracy of this expression is validated by comparing it with direct numerical simulations in a model porous structure.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Geosciences, Multidisciplinary
Yihuai Zhang, Branko Bijeljic, Ying Gao, Qingyang Lin, Martin J. Blunt
Summary: The study focuses on the pressure difference during two-phase flow across a sandstone sample with varying injection rates and fractional flows of water. It was observed that there is a transition from linear to non-linear flow with the power-law exponent depending on the fractional flow. By using energy balance, the onset of intermittency for a range of fractional flows, fluid viscosities, and rock types was accurately predicted.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Mechanics
Jessica Sanchez-Vargas, Francisco J. Valdes-Parada, Mauricio A. Trujillo-Roldan, Didier Lasseux
Summary: A closed macroscopic model for quasi-steady, inertial, incompressible, two-phase generalised Newtonian flow in rigid and homogeneous porous media is derived by upscaling the pore-scale equations. The derived model includes macroscopic equations for mass and momentum balance as well as an expression for the macroscopic pressure difference between the two fluid phases. The predictions from the upscaled models are in excellent agreement with direct numerical simulations, confirming the validity of the derived macroscopic models.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Engineering, Chemical
Julia Hartig, Vidumin Dahanayake, Julie Nguyen, Carter Wilson, Austin M. Barnes, Alan W. Weimer
Summary: A moving porous media (MPM) modeling methodology was developed for reactor-scale CFD simulations of continuous spatial particle atomic layer deposition (ALD). The continuous vibrating reactor process for particle ALD was modeled using a porous media approach. Candidate porous reactor baseplates were characterized experimentally before their permeabilities were used as inputs for the MPM model. Parameter sweeps revealed the dependence of surface titration uniformity and residual gas breakthrough on operating conditions and powder properties. Suboptimal dose start times and inlet gas compositions led to parasitic chemical vapor deposition reactions in the first precursor zone.
Article
Geosciences, Multidisciplinary
Ye Ma, Guanxi Yan, Alexander Scheuermann
Summary: This study developed a multiphase computational fluid dynamic (CFD) model to simulate discrete bubbly flow in a two-dimensional granular porous media at the pore scale. The simulation results provide insights into complex bubble transport behavior in porous media and show that the breakthrough time, average velocity of ambient pore water flow, and bubble plume width are proportional to the gas release rates.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Physics, Multidisciplinary
J. M. A. Sales, H. J. Seybold, C. L. N. Oliveira, J. S. Andrade
Summary: Two-phase flow through porous media can lead to the formation of drops and fingers, affecting macroscopic properties. In our simulation, we found that the system is ergodic for large volume fractions of the less viscous phase and high capillary numbers. Drop sizes follow a power-law scaling, with the exponent depending on the capillary number. The flow behavior changes at a characteristic capillary number, with large drops below and small droplets and finger-like structures dominating above. The temporal mean velocity of the mixture can be described by a generalized Darcy's law, and the exponent is sensitive to surface tension. In the limit of infinite capillary numbers, the mobility term increases exponentially with the saturation of the less viscous phase.
FRONTIERS IN PHYSICS
(2022)
Article
Engineering, Geological
Ivan Alhama, Encarnacion Martinez-Moreno, Gonzalo Garcia-Ros
Summary: This paper discusses the dimensional character of anisotropic permeability and presents a new approach based on discriminated and general dimensional analysis, introducing a new dimensionless group to correct the permeability. This method has been validated through numerical simulations of two illustrative 2-D seepage scenarios.
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2023)
Article
Mechanics
Linlin Fei, Feifei Qin, Jianlin Zhao, Dominique Derome, Jan Carmeliet
Summary: A mesoscopic lattice Boltzmann model is used to simulate isothermal two-component evaporation in porous media. The model incorporates a pseudopotential multiphase model with two components, and employs a cascaded collision operator for improved numerical performance. The model is validated through theoretical analysis and microfluidic experiments. The effects of inflow vapour concentration and contact angle on the evaporation process are investigated, and a scaling formulation for the evaporation rate is proposed.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Engineering, Ocean
Zeng Cao, Xu Liang, Yu Deng, Bairu Chen
Summary: A novel in-situ test method for permeability in saturated sandy porous media is introduced in this study, aiming to obtain permeability through the inversion of measured temperatures. The results show that the permeability obtained by this method is reliable and accurate within one order of magnitude in both numerical simulations and experimental tests.
APPLIED OCEAN RESEARCH
(2022)
Article
Mechanics
Zhongzheng Wang, Jean-Michel Pereira, Emilie Sauret, Yixiang Gan
Summary: The irregular growth of invading fluid during the imbibition process in two-dimensional regular porous media is studied. A phase diagram describing the dominance of different invasion events is proposed, and excellent agreement is observed on the transition boundary from faceted and compact displacement patterns to irregular and dendritic invasion morphologies.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Mechanics
Didier Lasseux, Francisco J. Valdes-Parada
Summary: This study presents a closed macroscopic model for immiscible two-phase flow in a rigid and homogeneous porous medium. The derived equations are obtained from the pore-scale equations and the model is validated through comparisons with direct numerical simulations.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Water Resources
Catherine Spurin, Tom Bultreys, Maja Ruecker, Gaetano Garfi, Christian M. Schleputz, Vladimir Novak, Steffen Berg, Martin J. Blunt, Samuel Krevor
Summary: Intermittent fluid flow has been found to play a significant role in the transport of subsurface multiphase fluids, impacting properties like relative permeability. Higher capillary numbers lead to increased volume of intermittent fluid fluctuations, expanding the flow network and reducing the influence of inertial forces on flow. The study shows that intermittent pathway flow is energetically positioned between laminar and turbulent flow through connected pathways, with implications on relative permeability.
ADVANCES IN WATER RESOURCES
(2021)
Article
Mechanics
Yihuai Zhang, Branko Bijeljic, Martin J. Blunt
Summary: This article reveals the nonlinear and intermittent features of multiphase flow in porous materials through experiments and simulations, and accurately predicts the start of intermittent flow using an energy balance method. The pore-scale explanation based on the periodic filling of critical flow pathways is further validated through X-ray imaging.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Engineering, Multidisciplinary
Kasra Soleimani, Ahmad Ghasemloonia, Leszek Sudak
Summary: Earlier modeling approaches in the field of mixtures assumed the solid phase as the main component, but failed to accurately capture mass exchange and stress-strain fields between phases. This study proposes an alternative method focusing on the advection term and mass exchange to capture the stress-strain fields. The developed model shows significant variations in displacement and stress fields, highlighting the importance of considering advection term and mass exchange.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2023)
Article
Mechanics
Anjali, Arshan Khan, P. Bera
Summary: This study investigates the thermal convection of Poiseuille flow in an anisotropic and inhomogeneous porous domain underlying a fluid domain using a two-domain approach. The impact of medium anisotropy and inhomogeneity on the stability of the fluid-porous system is analyzed through linear stability analysis and energy budget analysis. The results show that the mode of the system changes from unimodal (porous) to bimodal (both porous and fluid) with an increase in anisotropy or a decrease in inhomogeneity. Different modes and types of instability are identified based on various governing parameters. Secondary flow patterns are analyzed to validate the least stable mode and the prevailing instability in the system.
JOURNAL OF FLUID MECHANICS
(2022)
