Transport properties of porous γ-alumina from diffusion in liquids and gases

1988 ◽  
Vol 53 (6) ◽  
pp. 1217-1228
Author(s):  
Petr Uchytil ◽  
Petr Schneider
Keyword(s):  
Liquid Phase ◽  
Pore Structure ◽  
Transport Properties ◽  
Gas Diffusion ◽  
Diffusion In Liquids

Transport characteristics of four porous samples with bidisperse or broad monodisperse pore structure were determined by combination of diffusion and permeation measurements with simple gases and compared with results obtained from diffusion of toluene or α,α,α-trifluorotoluene in cyclohexane in liquid phase. From comparison of both types of results it followed that all pores are decisive for the rate of diffusional transport in liquids, whereas only the wide transport pores are significant in gas diffusion.

scholarly journals Liquid-Phase Synthesis, Sintering, and Transport Properties of Nanoparticle-Based Boron-Rich Composites

2021 ◽  
Author(s):  
Guillaume Gouget ◽  
Damien Bregiroux ◽  
Rémi Grosjean ◽  
David Montero ◽  
Stefan Maier ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Transport Properties ◽  
Phase Synthesis

Pore Structure Modeling of Flow in Gas Diffusion Layers of Proton Exchange Membrane Fuel Cells

2010 ◽  
Author(s):  
Zhongying Shi ◽  
Xia Wang
Keyword(s):  
Fuel Cell ◽  
Pore Structure ◽  
Proton Exchange Membrane ◽  
Cell Model ◽  
Transport Phenomena ◽  
Pem Fuel Cell ◽  
Gas Diffusion ◽  
Proton Exchange ◽  
Structure Model ◽  
Exchange Membrane

The gas diffusion layer (GDL) in a proton exchange membrane (PEM) fuel cell has a porous structure with anisotropic and non-homogenous properties. The objective of this research is to develop a PEM fuel cell model where transport phenomena in the GDL are simulated based on GDL’s pore structure. The GDL pore structure was obtained by using a scanning electron microscope (SEM). GDL’s cross-section view instead of surface view was scanned under the SEM. The SEM image was then processed using an image processing tool to obtain a two dimensional computational domain. This pore structure model was then coupled with an electrochemical model to predict the overall fuel cell performance. The transport phenomena in the GDL were simulated by solving the Navier-Stokes equation directly in the GDL pore structure. By comparing with the testing data, the fuel cell model predicted a reasonable fuel cell polarization curve. The pore structure model was further used to calculate the GDL permeability. The numerically predicted permeability was close to the value published in the literature. A future application of the current pore structure model is to predict GDL thermal and electric related properties.

Pore Structure Modeling of Flow in Gas Diffusion Layers of Proton Exchange Membrane Fuel Cells

2012 ◽  
Vol 9 (2) ◽  
Author(s):  
Z. Shi ◽  
X. Wang
Keyword(s):  
Fuel Cell ◽  
Pore Structure ◽  
Proton Exchange Membrane ◽  
Cell Model ◽  
Transport Phenomena ◽  
Pem Fuel Cell ◽  
Gas Diffusion ◽  
Proton Exchange ◽  
Structure Model ◽  
Exchange Membrane

The gas diffusion layer (GDL) in a proton exchange membrane (PEM) fuel cell has a porous structure with anisotropic and non-homogenous properties. The objective of this research is to develop a PEM fuel cell model where transport phenomena in the GDL are simulated based on GDL’s pore structure. The GDL pore structure was obtained by using a scanning electron microscope (SEM). GDL’s cross-section view instead of surface view was scanned under the SEM. The SEM image was then processed using an image processing tool to obtain a two-dimensional computational domain. This pore structure model was then coupled with an electrochemical model to predict the overall fuel cell performance. The transport phenomena in the GDL were simulated by solving the Navier-Stokes equation directly in the GDL pore structure. By comparing with the testing data, the fuel cell model predicted a reasonable fuel cell polarization curve. The pore structure model was further used to calculate the GDL permeability. The numerically predicted permeability was close to the value published in the literature. A future application of the current pore structure model is to predict GDL thermal and electric related properties.

Transport Properties of Grain Boundary Junctions Fabricated by Liquid Phase Epitaxy Method

2000 ◽  
pp. 1011-1013
Author(s):  
T. Takagi ◽  
J. G. Wen ◽  
K. Nakao ◽  
Y. Eltsev ◽  
T. Usagawa ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Grain Boundary ◽  
Transport Properties ◽  
Liquid Phase Epitaxy

Pore-structure and water transport properties of surfacetreated building stones

2000 ◽  
Vol 33 (3) ◽  
pp. 198-206 ◽  
Author(s):  
S. O. Nwaubani ◽  
M. Mulheron ◽  
G. P. Tilly ◽  
B. Schwamborn
Keyword(s):  
Pore Structure ◽  
Transport Properties ◽  
Water Transport ◽  
Building Stones ◽  
Water Transport Properties
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