A Numerical Investigation of the Thermal Stresses of a Planar Solid Oxide Fuel CellReportar como inadecuado


A Numerical Investigation of the Thermal Stresses of a Planar Solid Oxide Fuel Cell


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Institute of Chemical Engineering and Environmental Protection Processes, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology, Szczecin 71-065, Poland





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Academic Editor: Douglas Ivey

Abstract A typical operating temperature of a solid oxide fuel cell SOFC is quite high above 750 °C and affects the thermomechanical behavior of the cell. Thermal stresses may cause microstructural instability and sub-critical cracking. Therefore, a joint analysis by the computational fluid dynamics CFD and computational structural mechanics based on the finite element method FEM was carried out to analyze thermal stresses in a planar SOFC and to predict potential failure locations in the cell. A full numerical model was based on the coupling of thermo-fluid model with the thermo-mechanical model. Based on a temperature distribution from the thermo-fluid model, stress distribution including the von Mises stress, shear stress as well as the operating principal stress were derived in the thermo-mechanical model. The FEM calculations were performed under different working conditions of the planar SOFC. The highest total stress was noticed at the lower operating voltage of 0.3 V, while the lowest total stress was determined at the voltage of 0.7 V. The obtained stress distributions allowed a better understanding of details of internal processes occurring within the SOFC and provided helpful guidance in the optimization of a new SOFC design. View Full-Text

Keywords: thermal and residual stresses; planar solid oxide fuel cell SOFC; computational fluid dynamics CFD; finite element method FEM calculations thermal and residual stresses; planar solid oxide fuel cell SOFC; computational fluid dynamics CFD; finite element method FEM calculations





Autor: Paulina Pianko-Oprych * , Tomasz Zinko and Zdzisław Jaworski

Fuente: http://mdpi.com/



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