Journal ArticleDOI
Dynamics of water droplets detached from porous surfaces of relevance to PEM fuel cells.
Andreas Theodorakakos,T. Ous,Manolis Gavaises,Jamshid M. Nouri,Nikos Nikolopoulos,Hiromichi Yanagihara +5 more
- Vol. 300, Iss: 2, pp 673-687
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TLDR
Variable contact angle values around the gas-liquid-solid contact-line as well as their dynamic change during the droplet shape deformation process, have allowed estimation of the adhesion force between the liquid droplet and the solid surface and successful prediction of the separation line.Abstract:
The detachment of liquid droplets from porous material surfaces used with proton exchange membrane (PEM) fuel cells under the influence of a cross-flowing air is investigated computationally and experimentally. CCD images taken on a purpose-built transparent fuel cell have revealed that the water produced within the PEM is forming droplets on the surface of the gas-diffusion layer. These droplets are swept away if the velocity of the flowing air is above a critical value for a given droplet size. Static and dynamic contact angle measurements for three different carbon gas-diffusion layer materials obtained inside a transparent air-channel test model have been used as input to the numerical model; the latter is based on a Navier-Stokes equations flow solver incorporating the volume of fluid (VOF) two-phase flow methodology. Variable contact angle values around the gas-liquid-solid contact-line as well as their dynamic change during the droplet shape deformation process, have allowed estimation of the adhesion force between the liquid droplet and the solid surface and successful prediction of the separation line at which droplets loose their contact from the solid surface under the influence of the air stream flowing around them. Parametric studies highlight the relevant importance of various factors affecting the detachment of the liquid droplets from the solid surface.read more
Citations
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Journal ArticleDOI
A Critical Review of Modeling Transport Phenomena in Polymer-Electrolyte Fuel Cells
Adam Z. Weber,Rodney L. Borup,Robert M. Darling,Prodip K. Das,Thomas J. Dursch,Thomas J. Dursch,Wenbin Gu,David Harvey,David Harvey,Ahmet Kusoglu,Shawn Litster,Matthew M. Mench,Rangachary Mukundan,Jon P. Owejan,Jon G. Pharoah,Marc Secanell,Iryna V. Zenyuk +16 more
TL;DR: In this paper, the authors present the results of a study at the Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA and the United Technologies Research Center, East Hartford, Connecticut 06118, USA.
Journal ArticleDOI
Liquid water visualization in PEM fuel cells: A review
TL;DR: In this article, a literature review is provided for the experimental techniques that have been applied to visualize liquid water in operating hydrogen PEM fuel cells and flow fields, and the main hypotheses have been proposed to describe liquid water transport in the gas diffusion layer.
Journal ArticleDOI
Gas diffusion layer for proton exchange membrane fuel cells—A review
L. Cindrella,L. Cindrella,Arunachala Mada Kannan,Jiefeng Lin,K. Saminathan,Yuh-Shan Ho,C.W. Lin,J. Wertz +7 more
TL;DR: A bibliometric analysis of the publications on the GDLs since 1992 shows a total of 400+ publications (>140 papers in the Journal of Power Sources alone) and reveals an exponential growth due to reasons that PEMFC promises a lot of potential as the future energy source for varied applications as discussed by the authors.
Journal ArticleDOI
A Review of Water Management in Polymer Electrolyte Membrane Fuel Cells
Mengbo Ji,Zidong Wei +1 more
TL;DR: A comprehensive review of the state-of-the-art studies of water management, including the experimental methods and modeling and simulation for the characterization of water and the water management strategies, is presented in this article.
Journal ArticleDOI
Drop impact and wettability: From hydrophilic to superhydrophobic surfaces
TL;DR: In this article, the effect of surface wettability on impact characteristics of water drops onto solid dry surfaces were conducted. And the role of advancing contact angle and contact angle hysteresis as fundamental wetting parameters to allow understanding of different phases of drop spreading and beginning of recoiling was shown.
References
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Two-phase flow and transport in the air cathode of proton exchange membrane fuel cells
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Journal ArticleDOI
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Journal ArticleDOI
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