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Convective drying of porous media: comparison of phase-field simulations with microfluidic experiments

Maier, Lukas ; Brosch, Sebastian ; Gaehr, Magnus ; Linkhorst, John ; Wessling, Matthias ; Nieken, Ulrich (2024)
Convective drying of porous media: comparison of phase-field simulations with microfluidic experiments.
In: Transport in Porous Media, 151
doi: 10.1007/s11242-023-02051-y
Article, Bibliographie

Abstract

Convective drying of porous media is central to many engineering applications, ranging from spray drying over water management in fuel cells to food drying. To improve these processes, a deep understanding of drying phenomena in porous media is crucial. Therefore, detailed simulation of multiphase flows with phase change is of great importance to investigate the complex processes involved in drying porous media. While many studies aim to access the phenomena solely by simulations, here we succeed to compare comprehensively simulations with an experimental methodology based on microfluidic multiphase flow studies in engineered porous media. In this contribution, we propose a Navier--Stokes Cahn--Hilliard model coupled with balance equations for heat and moisture to simulate the two-phase flow with phase change. The phase distribution of the two fluids air and water is modeled by the Phase-Field equation. Comparisons with experiments are rare in the literature and usually involve very simple cases. We compare our simulation with convective drying experiments of porous media. Experimentally, the interface propagation of the water--air interface was visualized in detail during drying in a structured microfluidic cell made from PDMS. The drying pattern and the drying time in the experiment are very well reproduced by our simulation. This validation will enable the application for the presented Navier--Stokes Cahn--Hilliard model in more complex cases focused more on applications, e.g., in the field of fibrous materials.

Item Type: Article
Erschienen: 2024
Creators: Maier, Lukas ; Brosch, Sebastian ; Gaehr, Magnus ; Linkhorst, John ; Wessling, Matthias ; Nieken, Ulrich
Type of entry: Bibliographie
Title: Convective drying of porous media: comparison of phase-field simulations with microfluidic experiments
Language: English
Date: January 2024
Publisher: Springer
Journal or Publication Title: Transport in Porous Media
Volume of the journal: 151
DOI: 10.1007/s11242-023-02051-y
Abstract:

Convective drying of porous media is central to many engineering applications, ranging from spray drying over water management in fuel cells to food drying. To improve these processes, a deep understanding of drying phenomena in porous media is crucial. Therefore, detailed simulation of multiphase flows with phase change is of great importance to investigate the complex processes involved in drying porous media. While many studies aim to access the phenomena solely by simulations, here we succeed to compare comprehensively simulations with an experimental methodology based on microfluidic multiphase flow studies in engineered porous media. In this contribution, we propose a Navier--Stokes Cahn--Hilliard model coupled with balance equations for heat and moisture to simulate the two-phase flow with phase change. The phase distribution of the two fluids air and water is modeled by the Phase-Field equation. Comparisons with experiments are rare in the literature and usually involve very simple cases. We compare our simulation with convective drying experiments of porous media. Experimentally, the interface propagation of the water--air interface was visualized in detail during drying in a structured microfluidic cell made from PDMS. The drying pattern and the drying time in the experiment are very well reproduced by our simulation. This validation will enable the application for the presented Navier--Stokes Cahn--Hilliard model in more complex cases focused more on applications, e.g., in the field of fibrous materials.

Uncontrolled Keywords: drying, microfluidics, multiphase flow, phase change, phase-field model
Divisions: 16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Chair for Process Engineering of Electrochemical Systems
Date Deposited: 24 Jul 2024 08:11
Last Modified: 24 Jul 2024 08:11
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