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Droplet Imbibition into Paper Coating Layer: Pore-Network Modeling Simulation
- Source :
- Transport in Porous Media, 125(2), 239. Springer Netherlands, Transport in Porous Media
- Publication Year :
- 2018
-
Abstract
- Liquid penetration into thin porous media such as paper is often simulated using continuum-scale single-phase Darcy’s law. The underlying assumption was that a sharp invasion front percolates through the layer. To explore this ambiguous assumption and to understand the controlling pore-scale mechanisms, we have developed a dynamic pore-network model to simulate imbibition of a wetting phase from a droplet into a paper coating layer. The realistic pore structures are obtained using the FIB-SEM imaging of the coating material with a minimum resolution of 3.5 nm. Pore network was extracted from FIB-SEM images using Avizo software. Data of extracted pore network are used for statistically generating pore network. Droplet sizes are chosen in the range of those applicable in inkjet printing. Our simulations show no sharp invasion front exists and there is the presence of residual non-wetting phase. In addition, penetration of different sizes of droplets of different material properties into the pore network with different pore body and pore throat sizes are performed. We have found an approximately linear decrease in droplet volume with time. This contradicts the expected \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\sqrt{t}$$\end{document}t-behavior in vertical imbibition that is obtained using macroscopic single-phase Darcy’s law. With increase in flow rate, transition of imbibition invasion front from percolation-like pattern to a more sharper one with less trapping of non-wetting phase is also reported. Our simulations suggest that the single-phase Darcy’s law does not adequately describe liquid penetration into materials such as paper coating layer. Instead Richards equation would be a better choice.
- Subjects :
- Materials science
General Chemical Engineering
Imbibition
0208 environmental biotechnology
02 engineering and technology
Droplet penetration
engineering.material
Article
Catalysis
Physics::Fluid Dynamics
Coating
Pore-network model
Mechanics
Penetration (firestop)
021001 nanoscience & nanotechnology
020801 environmental engineering
Volumetric flow rate
Paper coating layer
engineering
Chemical Engineering(all)
Richards equation
Wetting
0210 nano-technology
Material properties
Porous medium
Subjects
Details
- Language :
- English
- ISSN :
- 01693913
- Volume :
- 125
- Issue :
- 2
- Database :
- OpenAIRE
- Journal :
- Transport in Porous Media
- Accession number :
- edsair.doi.dedup.....7da02fcb780c22bcb5638f93e4a033a6