Loughborough University
Leicestershire, UK
LE11 3TU
+44 (0)1509 263171
Loughborough University

Loughborough University Institutional Repository

Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/18546

Title: Determination of the anisotropic permeability of a carbon cloth gas diffusion layer through X-ray computer micro-tomography and single-phase lattice Boltzmann simulation
Authors: Rama, Pratap
Liu, Yu
Chen, Rui
Ostadi, Hossein
Jiang, Kyle
Zhang, Xiaoxian
Gao, Yuan
Grassini, Paolo
Brivio, Davide
Keywords: X-ray
Micro-tomography
Lattice Boltzmann
Polymer electrolyte fuel cell
Gas diffusion layer
Carbon cloth
Anisotropy
Permeability
Issue Date: 2011
Publisher: © John Wiley and Sons
Citation: RAMA, P. ... et al, 2011. Determination of the anisotropic permeability of a carbon cloth gas diffusion layer through X-ray computer micro-tomography and single-phase lattice Boltzmann simulation. International Journal for Numerical Methods in Fluids, 67 (4), pp. 518 - 530.
Abstract: An investigation of the anisotropic permeability of a carbon cloth gas diffusion layer (GDL) based on the integration of X-ray micro-tomography and lattice Boltzmann (LB) simulation is presented. The method involves the generation of a 3D digital model of a carbon cloth GDL as manufactured using X-ray shadow images acquired through X-ray micro-tomography at a resolution of 1.74 µm. The resulting 3D model is then split into 21 volumes and integrated with a LB single-phase numerical solver in order to predict three orthogonal permeability tensors when a pressure difference is prescribed in the through-plane direction. The 21 regions exhibit porosity values in the range of 0.910–0.955, while the average fibre diameter is 4 µm. The results demonstrate that the simulated through-plane permeability is about four times higher than the in-plane permeability for the sample imaged and that the corresponding degrees of anisotropy for the two orthogonal off-principal directions are 0.22 and 0.27. The results reveal that flow channelling can play an important role in gas transport through the GDL structure due to the non-homogeneous porosity distribution through the material. The simulated results are also applied to generate a parametric coefficient for the Kozeny–Carman (KC) method of determining permeability. The current research reveals that by applying the X-ray tomography and LB techniques in a complementary manner, there is a strong potential to gain a deeper understanding of the microscopic fluidic phenomenon in representative models of porous fuel cell structures and how this can influence macroscopic transport characteristics which govern fuel cell performance.
Description: This is the peer reviewed version of the following article: RAMA, P. ... et al, 2011. Determination of the anisotropic permeability of a carbon cloth gas diffusion layer through X-ray computer micro-tomography and single-phase lattice Boltzmann simulation. International Journal for Numerical Methods in Fluids, 67 (4), pp. 518 - 530, which has been published in final form at: http://dx.doi.org/10.1002/fld.2378. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
Sponsor: This research was supported by the UK Technology Strategy Board (TSB Project No.: TP/6/S/K3032H). We acknowledge the industrial partners AVL List GmbH, Intelligent Energy Ltd., Johnson Matthey Fuel Cells Ltd., Saati Group Inc. and Technical Fibre Products Ltd. for their support of this work.
Version: Accepted for publication
DOI: 10.1002/fld.2378
URI: https://dspace.lboro.ac.uk/2134/18546
Publisher Link: http://dx.doi.org/10.1002/fld.2378
ISSN: 0271-2091
Appears in Collections:Published Articles (Aeronautical and Automotive Engineering)

Files associated with this item:

File Description SizeFormat
Paper7_25092009v2.pdfAccepted version814.03 kBAdobe PDFView/Open

 

SFX Query

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.