Theoretical analysis of the effect of isotropy on the effective diffusion coefficient in the porous and agglomerated phase of the electrodes of a PEMFC [PDF]
Scientific ReportsIn polymer membrane fuel cells (PEMFC), the pore microstructure and the effective diffusion coefficient ( $$D_{eff}$$ D eff ) of the catalytic layer have a significant impact on the overall performance of the fuel cell. In this work, numerical methods to
C. Pacheco +3 more
doaj +5 more sources
Water Effective Diffusion Coefficient in Dairy Powder Calculated by Digital Image Processing and through Machine Learning Algorithms of CLSM Micrographs [PDF]
Foods, 2023 Rehydration of dairy powders is a complex and essential process. A relatively new quantitative mechanism for monitoring powders’ rehydration process uses the effective diffusion coefficient.
Valentyn A. Maidannyk +3 more
doaj +2 more sources
Scale Dependency of the Effective Matrix Diffusion Coefficient [PDF]
Vadose Zone Journal, 2004 It has been recognized that matrix diffusion is an important process for retarding solute transport in fractured rock. Based on analyses of tracer transport data from a number of field tests, we demonstrate for the first time that the effective matrix‐diffusion coefficient may be scale dependent and generally increases with test scale.
Hui‐Hai Liu, G.S. Bodvarsson, G. Zhang
+7 more sources
Effective diffusion coefficient including the Marangoni effect [PDF]
The Journal of Chemical Physics, 2018 Surface-active molecules supplied from a particle fixed at the water surface create a spatial gradient of the molecule concentration, resulting in Marangoni convection. Convective flow transports the molecules far from the particle, enhancing diffusion.
Hiroyuki Kitahata, Natsuhiko Yoshinaga
openaire +5 more sources
Evaluating the effective diffusion coefficient of reactant gas in the catalyst layer of PEMFC using the fractal method considering the pore size distribution [PDF]
Nano Select, 2021 The pore size distribution of the catalyst layer (CL) significantly influences the effective diffusion coefficient (EDC) of the reactant gas due to the Knudsen diffusion effect in the proton exchange membrane fuel cell (PEMFC).
Yan Yin +4 more
doaj +2 more sources
Effects of diffusive property heterogeneity on effective matrix diffusion coefficient for fractured rock [PDF]
Water Resources Research, 2006 Heterogeneities of diffusion properties are likely to influence the effective matrix diffusion coefficient determined from tracer breakthrough curves. The objectives of this study are (1) to examine if it is appropriate to use a single, effective matrix diffusion coefficient to predict breakthrough curves in a fractured formation, (2) to examine if a ...
Yingqi Zhang +3 more
openalex +4 more sources
Impact of Pore Geometry and Water Saturation on Gas Effective Diffusion Coefficient in Soil [PDF]
Applied Sciences, 2018 Gas flow in soil plays a crucial role in terrestrial ecosystems, and numerical simulation of their movement needs to know their effective diffusion coefficients.
Wulong Hu +5 more
doaj +2 more sources
Chemical Engineering Journal Advances, 2023 Accurate measurement of the gas diffusivity in a gas diffusion layer (GDL) for polymer electrolyte fuel cells (PEFCs) is extremely important in order to improve the performance of PEFCs and design fuel cell stacks.
Masahide Inagaki +2 more
doaj +2 more sources
Известия высших учебных заведений и энергетических объединенний СНГ: ЭнергетикаIn this study, the calculation and mathematical modelling of effective diffusion coefficient and activation energy in convective drying of a product were investigated. The shrinkage coefficient for different temperatures was also calculated.
J. E. Safarov +7 more
doaj +2 more sources
The effective diffusion coefficient of boron in the Fe2B layers formed on the iron substrate [PDF]
MATEC Web of Conferences, 2013 Keddam M. +3 more
doaj +2 more sources