Multi-scale three-domain approach for coupling free flow and flow in porous media including droplet-related interface processes

Ackermann, Sina; Bringedal, Carina; Helmig, Rainer

doi:10.1016/j.jcp.2020.109993

Cited by 11 publications

(19 citation statements)

References 17 publications

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“…One could either employ a two‐phase flow model concept for Ω FF or consider the formation of liquid drops (e.g. Ackermann et al., 2020; Baber et al., 2016) at the interface.…”

Section: Conceptual and Numerical Modelmentioning

confidence: 99%

A Dynamic and Fully Implicit Non‐Isothermal, Two‐Phase, Two‐Component Pore‐Network Model Coupled to Single‐Phase Free Flow for the Pore‐Scale Description of Evaporation Processes

Weishaupt

Helmig

2021

Water Resources Research

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“…One could either employ a two‐phase flow model concept for Ω FF or consider the formation of liquid drops (e.g. Ackermann et al., 2020; Baber et al., 2016) at the interface.…”

Section: Conceptual and Numerical Modelmentioning

confidence: 99%

A Dynamic and Fully Implicit Non‐Isothermal, Two‐Phase, Two‐Component Pore‐Network Model Coupled to Single‐Phase Free Flow for the Pore‐Scale Description of Evaporation Processes

Weishaupt

Helmig

2021

Water Resources Research

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“…In this section, we compare the drop growth behavior of the developed model to experimental data and a comparable drop model previously presented in the literature. Both data sets are presented by Ackermann et al in [16]. We analyse the droplet behavior without any surrounding gas flow.…”

Section: Drop Growth Without Surrounding Gas Flowmentioning

confidence: 99%

“…We analyse the droplet behavior without any surrounding gas flow. Similar to the REV-scale model presented in [16], a very simple setup is used to analyse the growth of a single droplet (see Fig. 5).…”

Section: Drop Growth Without Surrounding Gas Flowmentioning

confidence: 99%

“…In contrast Niblett et al [9] performed a VoF analysis of two-phase flow through a GDL including drop formation but they did not consider drop detachment. Ackermann et al [16] developed a more efficient but less accurate formulation to describe drop formation, growth and detachment on the REV-scale. They present a multi-scale approach to couple a porous domain with free flow.…”

Section: Introductionmentioning

confidence: 99%

“…In this article, we develop a simplified interface model based on the pore-network principles. In contrast to Ackermann et al [16], we consider the coupling processes between the porous domain and the free flow on the pore-scale. The developed model is an extension to the work of Weishaupt et al [17] by two-phase coupling processes at the interface.…”

Section: Introductionmentioning

confidence: 99%

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Two-phase flow dynamics at the interface between GDL and gas distributor channel using a pore-network model

Michalkowski¹,

Veyskarami²,

Bringedal³

et al. 2022

Preprint

Self Cite

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For improved operating conditions of a polymer electrolyte membrane (PEM) fuel cell, a sophisticated water management is crucial. Therefore, it is necessary to understand the transport mechanisms of water throughout the cell constituents especially on the cathode side, where the excess water has to be removed. Pore-scale modeling of diffusion layers and gas distributor has been established as a favorable technique to investigate the ongoing processes. Investigating the interface between the cathode layers, a particular challenge is the combination and interaction of the multi-phase flow in the porous material of the gas diffusion layer (GDL) with the free flow in the gas distributor channels. The formation, growth and detachment of water droplets on the hydrophobic, porous surface of the GDL have a major influence on the mass, momentum and energy exchange between the layers. A dynamic pore-network model is used to describe the flow through the porous GDL on the pore-scale. To capture the droplet occurrence and its influence on the flow, this dynamic two-phase pore-network model is extended to capture droplet formation and growth at the surface of the GDL as well as droplet detachment due to the gas flow in the gas distributor channels. In this article, the developed model is applied to single-and multi-tube systems to investigate the general drop behavior. These rather simple test-cases are compared to experimental and numerical data available in the literature. Finally, the model is applied to a GDL unit cell to analyse the interaction between two-phase flow through the GDL and drop formation at the interface between GDL and gas distributor channel.

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A multiscale LBM–TPM–PFM approach for modeling of multiphase fluid flow in fractured porous media

Chaaban

Heider

Markert

2022

Num Anal Meth Geomechanics

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In this paper, we present a reliable micro-to-macroscale framework to model multiphase fluid flow through fractured porous media. This is based on utilizing the capabilities of the lattice Boltzmann method (LBM) within the phase-field modeling (PFM) of fractures in multiphase porous media. In this, we propose new physically motivated phase-field-dependent relationships for the residual saturation, the intrinsic as well as relative permeabilities. In addition, an anisotropic, phase-field-dependent intrinsic permeability tensor for the fractured porous domains is formulated, which relies on the single-and multiphasic LBM flow simulations. Based on these results, new relationships for the variation of the macroscopic theory of porous media (TPM)-PFM model parameters in the transition zone are proposed. Whereby, a multiscale concept for the coupling between the multiphasic flow through the crack on one hand and the porous ambient, on the other hand, is achieved. The hybrid model is numerically applied on a real microgeometry of fractured porous media, extracted via X-ray microcomputed tomography data of fractured Berea Sandstone. Moreover, the model is utilized for the calculation of the fluid leak-off from the crack to the intact zones. Additionally, the effects of the depth of the transition zone and the orientation of the crack channels on the amount of leakage flow rates are studied. The outcomes of the numerical model proved the reliability of the multiscale model to simulate multiphasic fluid flow through fractured porous media.

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Multi-scale three-domain approach for coupling free flow and flow in porous media including droplet-related interface processes

Cited by 11 publications

References 17 publications

A Dynamic and Fully Implicit Non‐Isothermal, Two‐Phase, Two‐Component Pore‐Network Model Coupled to Single‐Phase Free Flow for the Pore‐Scale Description of Evaporation Processes

A Dynamic and Fully Implicit Non‐Isothermal, Two‐Phase, Two‐Component Pore‐Network Model Coupled to Single‐Phase Free Flow for the Pore‐Scale Description of Evaporation Processes

Two-phase flow dynamics at the interface between GDL and gas distributor channel using a pore-network model

A multiscale LBM–TPM–PFM approach for modeling of multiphase fluid flow in fractured porous media

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