Article
Energy & Fuels
Narvin D. Neehall, Mohammed S. Ismail, Kevin J. Hughes, Mohamed Pourkashanian
Summary: The through-plane gas permeability and morphology of PEFC gas diffusion media (GDM) were investigated for different microporous layer (MPL) ink homogenisation techniques (bath sonication and magnetic stirring) for low- (Vulcan XC-72R) and high- (Ketjenblack EC-300J) surface-area carbon powders. The results showed that magnetic stirring doubled the through-plane gas permeability of GDM compared to bath sonication for MPLs composed of Vulcan XC-72R, while there was negligible change in surface morphology. For MPLs composed of Ketjenblack EC-300J, the through-plane gas permeability varied almost negligibly, but the MPL surface morphology changed considerably with bath sonication, leading to smoother, less cracked surfaces compared to magnetic stirring.
Article
Energy & Fuels
Guanqun Li, Yuliang Su, Wendong Wang, Qinghao Sun
Summary: This study investigates the mechanism of forced imbibition in energized hydraulic fracturing technology and establishes mathematical models. The research finds that forced imbibition is faster than spontaneous imbibition and leads to higher oil recovery, with smaller pores playing a significant role in the imbibition rate.
Article
Chemistry, Physical
Mohammad Javad Shojaei, Branko Bijeljic, Yihuai Zhang, Martin J. Blunt
Summary: In this study, we investigate the arrangement of fibers, water, and air in pore space by injecting water through gas diffusion layers with different percentages of polytetrafluoroethylene (PTFE) coating. By utilizing high-resolution three-dimensional X-ray imaging, we analyze the contact angle and meniscus curvature once water reaches equilibrium. The results show that the amount of coating affects the average contact angle and water pressure at breakthrough, with a wide range of contact angles indicating a mixed-wet state. The presence of minimal surfaces suggests that the fluid phases are well connected, allowing for the simultaneous flow of two phases over a wide saturation range. These findings have implications for the design of porous materials.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Energy & Fuels
Scott Higgs, Ying Da Wang, Chenhao Sun, Jonathan Ennis-King, Samuel J. Jackson, Ryan T. Armstrong, Peyman Mostaghimi
Summary: Underground Hydrogen Storage (UHS) is a technology aimed at storing renewable energy and reducing energy market fluctuations. The study compares the properties of different gas-water systems and finds that nitrogen and methane can be suitable analogue gases for UHS projects, improving safety and economics.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Thermodynamics
Supriya Karmakar, Priyanka Shukla
Summary: The linear stability of a plane Poiseuille flow in a channel with anisotropic and inhomogeneous porous layers is analyzed by solving the generalized Darcy and Navier-Stokes equations. The coupling between the flows in the porous and fluid layers is considered using the Beaver-Joseph interface condition. The spectral collocation method is employed to solve the Orr-Sommerfeld eigenvalue problem for disturbances of arbitrary wavenumbers, and the effect of anisotropy and inhomogeneity on stability characteristics is investigated.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2023)
Article
Engineering, Civil
Xin Liu, Annan Zhou, Shui-long Shen, Jie Li
Summary: The pore morphology method (PMM) is commonly used to simulate the drainage process of porous media. A new enhanced method called Lvca-PMM is proposed, which takes into account locally variable contact angles and can reproduce the primary drainage process under different wettability conditions.
JOURNAL OF HYDROLOGY
(2022)
Article
Engineering, Chemical
Fuyong Wang, Jiuyu Zhao
Summary: Liquid imbibition with dynamic contact angle in porous media is a common phenomenon, and its analysis poses challenges. A mathematical model is developed to explore the impact of dynamic contact angle on imbibition velocity, showing a nonlinear correlation between imbibition velocity and imbibition time.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Thermodynamics
Masahito Nishikawara, Toshihiro Sako, Hiroshi Yokoyama, Hideki Yanada
Summary: Porous media using short copper micro/nanofibers were created and evaluated for their wicking characteristics and drying characteristics. Different measurement methods were employed to obtain various parameters, and the features of each method were compared.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Chemistry, Physical
Umesh Shinde, Poornesh K. Koorata
Summary: The study reports a localized non-intuitive relationship between electrical interface contact resistance and bulk properties in the fuel cell gas diffusion layer (GDL). Results show that the sensitivity of GDL material models and endplate designs can affect the interface contact resistance. Furthermore, the study reveals an inverse relationship between contact resistance and bulk properties at the interface.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Energy & Fuels
Narvin D. Neehall, Mohammed S. Ismail, Kevin J. Hughes, Mohamed Pourkashanian
Summary: Experimental investigation reveals that the through-plane permeability of gas diffusion media is influenced by the composition and structure of the microporous layer (MPL) and gas diffusion layer (GDL), where the increase in carbon loading generally leads to a decrease in permeability, except for specific structures using Ketjenblack EC-300J carbon powder.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Mechanics
Subhashis Patari, Imdad Uddin Chowdhury, Jitendra Kumar, Pallab Sinha Mahapatra
Summary: In recent decades, there has been an increasing use of paper-based microfluidic devices, leading to a focus on liquid flow through paper substrates. To predict this flow, an analytical and numerical model was constructed, considering various factors. The developed models were validated through experiments, showing good agreement.
Article
Engineering, Chemical
Liang Zhao, Li Zhuang, Zhijun Zhang
Summary: Contact angle is an important parameter for the hydrophobicity of solid surfaces, and it is widely used in assessing the wetting and floatability of mineral particles. A composite method combining image processing analysis and force balance calculation was proposed to directly measure the contact angle of particles. The accuracy and convenience of this method were confirmed through experiments showing good agreement between observed and calculated contact angles. The effects of particle size, hydrophobized time, and bubble size on the contact angle distribution were investigated using hydrophobized glass beads.
MINERALS ENGINEERING
(2023)
Article
Energy & Fuels
Yin Gao, Keliu Wu, Zhangxing Chen, Tong Zhou, Jing Li, Dong Feng, Yanling Gao, Weibing Tian
Summary: This study investigates the impact of wetting hysteresis on fluid flow in shale oil reservoirs by establishing threshold pressure and flow resistance models. The results show that both threshold pressure and flow resistance increase with decreasing pore size, with flow resistance caused by dynamic wetting hysteresis being greater than threshold pressure caused by static wetting hysteresis.
Article
Engineering, Chemical
N. Younes, Z. Benseghier, O. Millet, A. Wautier, F. Nicot, R. Wan
Summary: In this paper, a phase-field based Lattice Boltzmann model is proposed to simulate the formation and coalescence of capillary bridges between spherical solid particles as well as the associated capillary forces. Two benchmark examples are considered to validate the proposed model, and the numerical results are in good agreement with experimental and numerical data. The proposed model provides a viable framework for capturing the complex capillary interface evolution during the wetting of a large assembly of particles.
Article
Mechanics
J. Haerter, D. S. Martinez, R. Poser, B. Weigand, G. Lamanna
Summary: This study verifies the assumptions of theoretical studies by using PIV to measure the velocity in two different porosity porous models at different Reynolds numbers. The results indicate that large-scale turbulent structures generated by the interaction with a turbulent outer flow exist and rapidly decay within the porous medium, validating closure models for volume-averaged computational studies.
Article
Chemistry, Multidisciplinary
P. Lettenmeier, S. Kolb, N. Sata, A. Fallisch, L. Zielke, S. Thiele, A. S. Gago, K. A. Friedrich
ENERGY & ENVIRONMENTAL SCIENCE
(2017)
Article
Chemistry, Physical
Arne Fallisch, Leon Schellhase, Jan Fresko, Mario Zedda, Jens Ohlmann, Marc Steiner, Armin Boesch, Lukas Zielke, Simon Thiele, Frank Dimroth, Toni Smolinka
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2017)
Article
Chemistry, Physical
Arne Fallisch, Leon Schellhase, Jan Fresko, Martin Zechmeister, Mario Zedda, Jens Ohlmann, Lukas Zielke, Nils Paust, Tom Smolinka
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2017)
Article
Energy & Fuels
N. Mingirulli, D. Stuewe, J. Specht, A. Fallisch, D. Biro
PROGRESS IN PHOTOVOLTAICS
(2011)
Article
Chemistry, Multidisciplinary
L. Zielke, A. Fallisch, N. Paust, R. Zengerle, S. Thiele
Article
Energy & Fuels
A. Fallisch, D. Biro
IEEE JOURNAL OF PHOTOVOLTAICS
(2011)
Article
Energy & Fuels
A. Fallisch, D. Wagenmann, R. Keding, D. Trogus, M. Hofmann, J. Rentsch, H. Reinecke, D. Biro
IEEE JOURNAL OF PHOTOVOLTAICS
(2012)
Article
Energy & Fuels
Sebastian Rau, Severin Vierrath, Jens Ohlmann, Arne Fallisch, David Lackner, Frank Dimroth, Tom Smolinka
Article
Chemistry, Physical
G. Bender, M. Carmo, T. Smolinka, A. Gago, N. Danilovic, M. Mueller, F. Ganci, A. Fallisch, P. Lettenmeier, K. A. Friedrich, K. Ayers, B. Pivovar, J. Mergel, D. Stolten
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2019)
Article
Chemistry, Physical
Thomas Lickert, Maximilian L. Kiermaier, Kolja Bromberger, Jagdishkumar Ghinaiya, Sebastian Metz, Arne Fallisch, Tom Smolinka
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2020)
Article
Chemistry, Multidisciplinary
S. Stiber, N. Sata, T. Morawietz, S. A. Ansar, T. Jahnke, J. K. Lee, A. Bazylak, A. Fallisch, A. S. Gago, K. A. Friedrich
Summary: This study presents a high-performance, durable, and cost-effective PEMWE cell with coated stainless steel bipolar plates and porous transport layers. By applying non-precious metal coatings of Ti and Nb/Ti on the stainless steel components, the current density can be significantly increased while maintaining the same performance. The results demonstrate the feasibility of manufacturing PEMWE cells almost entirely in stainless steel, leading to a substantial cost reduction in the technology.
ENERGY & ENVIRONMENTAL SCIENCE
(2022)
Proceedings Paper
Energy & Fuels
Jens Ohlmann, Juan Francisco Martinez Sanchez, David Lackner, Paul Foerster, Marc Steiner, Arne Fallisch, Frank Dimroth
12TH INTERNATIONAL CONFERENCE ON CONCENTRATOR PHOTOVOLTAIC SYSTEMS (CPV-12)
(2016)