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Performance Evaluation of an Anode-supported Honeycomb Solid Oxide Fuel Cell
Fukushima, Akira,Nakajima, Hironori,Kitahara, Tatsumi The Electrochemical Society 2013 ECS transactions Vol.50 No.48
<P>An anode-supported honeycomb SOFC that can achieve high power density and enhanced durability was developed. Electrolyte layer of 8YSZ (8 mol% yittria stabilized zirconia) is employed by dip-coating an anode honeycomb substrate of Ni/YSZ, followed by being coated with cathode layer of La<SUB>0.7</SUB>Sr<SUB>0.3</SUB>MnO<SUB>3</SUB>. Current-voltage and current-power density characteristics of the cells having different anode and cathode flow channel configurations at 850 were measured. The results show promising performances of the cell as a starting point to develop stacks composed of multiple honeycomb cells.</P>
Extended-FEM for the solid-fluid mixture two-scale problems with BCC and FCC microstructures
Sawada, Tomohiro,Nakasumi, Shogo,Tezuka, Akira,Fukushima, Manabu,Yoshizawa, Yu-Ichi Techno-Press 2009 Interaction and multiscale mechanics Vol.2 No.1
An aim of the study is to develop an efficient numerical simulation technique that can handle the two-scale analysis of fluid permeation filters fabricated by the partial sintering technique of small spherical ceramics. A solid-fluid mixture homogenization method is introduced to predict the mechanical characters such as rigidity and permeability of the porous ceramic filters from the micro-scale geometry and configuration of partially-sintered particles. An extended finite element (X-FE) discretization technique based on the enriched interpolations of respective characteristic functions at fluid-solid interfaces is proposed for the non-interface-fitted mesh solution of the micro-scale analysis that needs non-slip condition at the interface between solid and fluid phases of the unit cell. The homogenization and localization performances of the proposed method are shown in a typical two-dimensional benchmark problem whose model has a hole in center. Three-dimensional applications to the body-centered cubic (BCC) and face-centered cubic (FCC) unit cell models are also shown in the paper. The 3D application is prepared toward the computer-aided optimal design of ceramic filters. The accuracy and stability of the X-FEM based method are comparable to those of the standard interface-fitted FEM, and are superior to those of the voxel type FEM that is often used in such complex micro geometry cases.