Dynamic pore-network modeling of air-water flow through thin porous layers
Final Accepted Manuscript
AffiliationUniv Arizona, Dept Hydrol & Atmospher Sci
KeywordsThin porous media
polymer electrolyte fuel cell (PEFC)
Water and heat management
MetadataShow full item record
PublisherPERGAMON-ELSEVIER SCIENCE LTD
CitationQin, C. Z., Guo, B., Celia, M., & Wu, R. (2019). Dynamic Pore-Network Modeling of Air-Water Flow through Thin Porous Layers. Chemical Engineering Science.
JournalCHEMICAL ENGINEERING SCIENCE
Rights© 2019 Elsevier Ltd. All rights reserved.
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at firstname.lastname@example.org.
AbstractThin porous layers, that have large aspect ratios, are seen in many applications such as hydrogen fuel cells and hygiene products, in which air-water immiscible flow is of great interest. Direct numerical simulations based on Navier-Stokes equation are computationally expensive, and even prohibitive for low capillary number flow such as water flooding in low-temperature polymer electrolyte fuel cells. Alternatively, the pore-network modeling needs much less computational resources, while still retaining essentials of the pore-structure information. In this work, a dynamic pore-network model of air-water flow with phase change has been developed. We focus on drainage processes through thin porous layers, in which liquid water is the nonwetting phase. Three test cases are conducted, namely, air-water flow through a thin porous layer, air-water flow through a bilayer of fine and coarse thin porous layers, and water flooding in the gas diffusion layer of a polymer electrolyte fuel cell with phase change between water and its vapor. Using these test cases, we aim to demonstrate the application of dynamic pore-network modeling in thin porous media studies. In particular, we discuss the challenge of modeling thin porous media at the average scale, and highlight the role of phase change in removing liquid water from the cathode gas diffusion layer. (C) 2019 Elsevier Ltd. All rights reserved.
Note24 month embargo; published online: 16 March 2019
VersionFinal accepted manuscript
SponsorsDarcy Center of Utrecht University; National Natural Science Foundation of China ; Eindhoven University of Technology