Modeling of thermal stresses in a microtubular Solid Oxide Fuel Cell stack

Pianko‐Oprych, Paulina; Zinko, Tomasz; Jaworski, Z.

doi:10.1016/j.jpowsour.2015.09.047

Cited by 18 publications

(6 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A constant heat fl ux value was set for the electrochemically active part of the fuel cell tubes. The heat fl ux value was calculated using an analytical estimation based on experimental U-I curves 8 . In this approach the heat fl ux value, q, was estimated from equation (1) To develop a simplifi ed low order mSOFC stack model the following additional assumptions were made: the computational domain (cathode side) consisted only of the air volume, therefore both the fuel channel and the membrane-electrode assembly (MEA) were not included in the calculations.…”

Section: Resultsmentioning

confidence: 99%

Quantification of the Radiative and Convective Heat Transfer Processes and their Effect on mSOFC by CFD Modelling

Pianko‐Oprych

Касилова

Jaworski

2014

Polish Journal of Chemical Technology

Self Cite

View full text Add to dashboard Cite

The CFD modelling of heat transfer in a microtubular Solid Oxide Fuel Cell (mSOFC) stack has been presented. Stack performance predictions were based on a 16 anode-supported microtubular SOFCs sub-stack, which is a component of the overall stack containing 64 fuel cells. Both radiative and convective heat transfer were taken into account in the modelling. The heat fl ux value corresponded to the cell voltage of 0.7 [V]. Two different cases of the inlet air velocity of 2.0 and 8.5 [ms -1 ] were considered. It was found that radiation accounted for about 20-30 [%] of the total heat fl ux from the active tube surface, which means that the convective heat transfer predominated over the radiative one.

show abstract

Section: Resultsmentioning

confidence: 99%

Quantification of the Radiative and Convective Heat Transfer Processes and their Effect on mSOFC by CFD Modelling

Pianko‐Oprych

Касилова

Jaworski

2014

Polish Journal of Chemical Technology

Self Cite

View full text Add to dashboard Cite

show abstract

“…1 [11]. A full numerical model was based on the coupling of mass (1), momentum (2) and energy (3) balance equations with electrochemical reactions and electrochemical potential equations as well as the total strain (6) and stressestrain relationship (8) for materials and the model was described in details in a former paper [13].…”

Section: Numerical Methodologymentioning

confidence: 99%

“…In addition, the following assumptions were made in the thermo-mechanical model: the stress free temperature value was assumed as the sintering temperature of the anode layer with the electrolyte and it was equal to 1473 K, while a connection of the anode and electrolyte layers with the cathode layer during the second sintering process was assumed at the sintering temperature of 1323 K. Moreover, material properties were assumed independent of porosity, the effect of gravity was neglected and the only load in the thermo-mechanical model was the working temperature of fuel cells estimated in the CFD modelling [13].…”

Section: Boundary Conditionsmentioning

confidence: 99%

Simulation of thermal stresses for new designs of microtubular Solid Oxide Fuel Cell stack

Pianko‐Oprych

Zinko

Jaworski

2015

International Journal of Hydrogen Energy

View full text Add to dashboard Cite

Thermal stresses Microtubular Solid Oxide Fuel Cell stack Computational fluid dynamics Computational structural mechanics Optimization design a b s t r a c t The aim of this study was to improve design of microtubular Solid Oxide Fuel Cell (mSOFC) stacks. Three-dimensional models were developed in order to investigate the effect of flow channel and fuel cells arrangement on thermal stresses of the mSOFC stacks and their performance. Two geometries of the anode-supported mSOFC stack were considered. The paper presents modifications of fuel cell arrangement in the stacks and analyses for two ways of stack cooling carried out by coupling a Computational Fluid Dynamics (CFD) andComputational Structural Mechanics (CSM). The simulation results indicate that the lowest value of the total displacement of the assembly was noticed for the mSOFC stack design with an external air flow cooling (case HeE). In addition, the smallest axial and total stresses were recognized for the same case HeE due to uniform temperature distribution, which limits strain of the materials and prevents development of excessive thermal stresses in the mSOFC stack components.

show abstract

“…Due to the complexity and mutual interaction of physical phenomena as well as strong dependence on operation conditions, mathematical modeling is indispensable to gain insight about performance for realistic and critical scenarios. In addition to an electrochemical perspective to assess thermodynamic performance, 23,24 a systems perspective should also take into account thermo‐mechanical aspects 25,26 to analyze overall metrics that specify the system's lifetime, such as reliability 27‐35 …”

Section: Introductionmentioning

confidence: 99%

“…In addition to an electrochemical perspective to assess thermodynamic performance, 23,24 a systems perspective should also take into account thermo-mechanical aspects 25,26 to analyze overall metrics that specify the system's lifetime, such as reliability. [27][28][29][30][31][32][33][34][35] Operation under relatively benign conditions in terms of transient gradients already leads to complex control strategies, because of the number of physical variables that need to be controlled as well as material and operational constraints. For safe and economically feasible system start-up, further requirements need to be addressed, 36,37 for example, the use of inert gas (so-called safety gas) 38 to maintain proper conditions with respect to chemical potential in the material and thus avoiding excessive stresses under rapid transients.…”

mentioning

confidence: 99%

Transient simulation of failures during start‐up and power cut of a solid oxide fuel cell system using multiphysics modeling

Colombo

Хартон

Berto

et al. 2020

Mat Design & Process Comms

View full text Add to dashboard Cite

We investigate failure incidents of a solid oxide fuel cell (SOFC) system during start-up from ambient conditions as well as during operation around the design point, using numerical simulation with a view to performance and thermo-mechanical stresses. During start-up, which comprises heating and load ramping phases, the system's trajectory moves through a relatively large temperature range. The simulated failure scenarios include reversible operational discontinuities in terms of input parameters and irreversible hardware failures. Furthermore, we also present results for a complete power cut. A multiphysics modeling approach is used to couple thermal, electrochemical, chemical, and thermo-mechanical phenomena by means of time-dependent partial differential, algebraic, and integral equations. Simulations revealed that the system can smooth out thermal discontinuities that are within a few minutes, that is, within the range of its thermal inertia. However, during the initial phase of the start-up procedure, thermo-mechanical stresses are relatively high due to larger differences between the sintering (manufacturing) and operation temperature, which makes the system more susceptible to failure. This work demonstrates that a multiphysics approach with control-and reliability-relevant aspects leads to a realistic problem formulation and analysis for practical applications.

show abstract

Modeling of thermal stresses in a microtubular Solid Oxide Fuel Cell stack

Cited by 18 publications

References 21 publications

Quantification of the Radiative and Convective Heat Transfer Processes and their Effect on mSOFC by CFD Modelling

Quantification of the Radiative and Convective Heat Transfer Processes and their Effect on mSOFC by CFD Modelling

Simulation of thermal stresses for new designs of microtubular Solid Oxide Fuel Cell stack

Transient simulation of failures during start‐up and power cut of a solid oxide fuel cell system using multiphysics modeling

Contact Info

Product

Resources

About