The structure effects on electro-osmosis in microporous media have been studied by modeling the multiphysical transport using our numerical framework. The three-dimensional microstructures of porous media are reproduced by a random generation-growth method, and then the nonlinear governing equations for the electrokinetic transport are solved by a highly efficient lattice Poisson–Boltzmann method. The simulation results indicate that the porous structure type (granular, fibrous, or network) influences the electro-osmotic permeability significantly. At the low porosity regime (<0.4), the network structure exhibits the highest electro-osmotic permeability because of its highest surface–volume ratio among the three types of structure at the same porosity. When the porosity is high (>0.5), the granular structure leads to the highest electro-osmotic permeability due to its lower shape resistance characteristics. The present modeling results improve our understanding of hydrodynamic and electrokinetic transport in geophysical systems, and help guide the design of porous electrodes in micro-energy systems.
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Structure Effects on Electro-Osmosis in Microporous Media
Moran Wang
Moran Wang
School of Aerospace,Tsinghua University, Beijing 100084, China;
Earth and Environmental Sciences Division, Los Alamos National Laboratory
, Los Alamos, NM 87545moralwang@gmail.com
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Moran Wang
School of Aerospace,Tsinghua University, Beijing 100084, China;
Earth and Environmental Sciences Division, Los Alamos National Laboratory
, Los Alamos, NM 87545moralwang@gmail.comJ. Heat Transfer. May 2012, 134(5): 051020 (6 pages)
Published Online: April 13, 2012
Article history
Received:
July 30, 2010
Revised:
July 2, 2011
Published:
April 11, 2012
Online:
April 13, 2012
Citation
Wang, M. (April 13, 2012). "Structure Effects on Electro-Osmosis in Microporous Media." ASME. J. Heat Transfer. May 2012; 134(5): 051020. https://doi.org/10.1115/1.4005711
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