Detailed Electrochemistry and Gas Transport in a SOFC Anode Using the Lattice Boltzmann Method

2006 ◽  
Author(s):  
Kyle N. Grew ◽  
Abhijit S. Joshi ◽  
Aldo A. Peracchio ◽  
Wilson K. S. Chiu
Keyword(s):  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Electrochemical Reaction ◽  
Coupled Model ◽  
Transport Processes ◽  
Flux Boundary Conditions ◽  
Sofc Anode ◽  
Boltzmann Method ◽  
Electrochemical Model ◽  
And Diffusion

A coupled electrochemical reaction and diffusion model has been developed and verified for investigation of mass transport processes in Solid Oxide Fuel Cell (SOFC) anode triple-phase boundary (TPB) regions. The coupled model utilizes a two-dimensional (2D), multi-species Lattice Boltzmann Method (LBM) to model the diffusion process. The electrochemical model is coupled through localized flux boundary conditions and is a function of applied activation overpotential and the localized hydrogen and water mole fractions. This model is designed so that the effects of the anode microstructure within TPB regions can be examined in detail. Results are provided for the independent validation of the electrochemical and diffusion sub-models, as well as for the coupled model. An analysis on a single closed pore is completed and validated with a Fick's law solution. A competition between the electrochemical reaction rate and the rate of mass transfer is observed to be dependent on inlet hydrogen mole fraction. The developed model is presented such that future studies on SOFC anode microstructures can be completed.

Evaluation of Lattice Boltzmann Method for Reaction-Diffusion Process in a Porous SOFC Anode Microstructure

2012 ◽  
Author(s):  
Hedvig Paradis ◽  
Bengt Sundén
Keyword(s):  
Porous Media ◽  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Reaction Diffusion ◽  
Reaction Rates ◽  
Transport Processes ◽  
Microscopic Level ◽  
Reaction Diffusion Equation ◽  
Interaction Sites ◽  
Boltzmann Method

In the microscale structure of a porous electrode, the transport processes are among the least understood areas of SOFC. The purpose of this study is to evaluate the Lattice Boltzmann Method (LBM) for a porous microscopic media and investigate mass transfer processes with electrochemical reactions by LBM at a mesoscopic and microscopic level. Part of the anode structure of an SOFC for two components is evaluated qualitatively for two different geometry configurations of the porous media. The reaction-diffusion equation has been implemented in the particle distribution function used in LBM. The LBM code in this study is written in the programs MATLAB and Palabos. It has here been shown that LBM can be effectively used at a mesoscopic level ranging down to a microscopic level and proven to effectively take care of the interaction between the particles and the walls of the porous media. LBM can also handle the implementation of reaction rates where these can be locally specified or as a general source term. It is concluded that LBM can be valuable for evaluating the risk of local harming spots within the porous structure to reduce these interaction sites. In future studies, the information gained from the microscale modeling can be coupled to a macroscale CFD model and help in development of a smooth structure for interaction of the reforming reaction and the electrochemical reaction rates. This can in turn improve the cell performance.

scholarly journals 3D analysis, modeling and simulation of transport processes in compressed fibrous microstructures, using the Lattice Boltzmann method

2013 ◽  
Vol 110 ◽  
pp. 325-334 ◽  
Author(s):  
Dieter Froning ◽  
Jan Brinkmann ◽  
Uwe Reimer ◽  
Volker Schmidt ◽  
Werner Lehnert ◽  
...  
Keyword(s):  
Modeling And Simulation ◽  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Transport Processes ◽  
3D Analysis ◽  
Boltzmann Method

Microscopic study of ion transport in porous electrode of desalination battery based on Lattice Boltzmann method

2022 ◽  
Author(s):  
Shouguang Yao ◽  
Jianguo Luo ◽  
Rui Liu ◽  
Xiaoyu Shen ◽  
Xinyu Huang
Keyword(s):  
Ion Transport ◽  
Lattice Boltzmann Method ◽  
Microscopic Study ◽  
Lattice Boltzmann ◽  
Electrochemical Reaction ◽  
Porous Electrode ◽  
Active Particles ◽  
Boltzmann Method

The desalting process of desalting battery includes ion transport in pores, diffusion in active particles and electrochemical reaction at the interface between solution and active particles. In this paper, quartet...

Modelling Phases Formed during Boriding for Estimation of the Depth of Boron through the Growing in Substrate by the Lattice Boltzmann Method ‎

2016 ◽  
Vol 369 ◽  
pp. 177-181
Author(s):  
A.T. Debicha ◽  
Karim Rayane ◽  
Omar Allaoui
Keyword(s):  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Boride Layer ◽  
Collision Theory ◽  
Boltzmann Method ◽  
And Diffusion

The objective of this work is to predict for a given concentration, what will be the depth of the boride layer under set conditions using collision theory between atoms and diffusion by means of the Lattice Boltzmann Method.

scholarly journals Modeling of a Gradient Porosity SOFC Anode using the Lattice Boltzmann Method

2017 ◽  
Vol 105 ◽  
pp. 1332-1338 ◽  
Author(s):  
Mayken Espinoza-Andaluz ◽  
Martin Andersson ◽  
Bengt Sundén
Keyword(s):  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Sofc Anode ◽  
Boltzmann Method

scholarly journals Lattice Boltzmann Method and diffusion in materials with large diffusivity ratios

2017 ◽  
Vol 21 (3) ◽  
pp. 1173-1182 ◽  
Author(s):  
Édouard Walther ◽  
Rachid Bennacer ◽  
Sa De
Keyword(s):  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Heterogeneous Materials ◽  
Homogeneous Material ◽  
Pure Diffusion ◽  
Relaxation Factors ◽  
Boltzmann Method ◽  
And Diffusion

This work is centered on the safe usage of the lattice Boltzmann method for 2-D pure diffusion. The basics of the method for pure diffusion are first elucidated using a new definition given in the paper. The oscillating behavior and safe conditions of use are then explored in the case of homogeneous material as well as heterogeneous materials with circular and plane interfaces. As a conclusion, the range of valid relaxation factors is given for a correct use of lattice Boltzmann method.

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