TY - JOUR
T1 - Entropy generation analysis of a solid oxide fuel cell by computational fluid dynamics
T2 - Influence of electrochemical model and its parameters
AU - Ramirez-Minguela, Jose J.
AU - Mendoza-Miranda, Juan M.
AU - Rodriguez-Munoz, Jose L.
AU - Perez-Garcia, Vicente
AU - Alfaro-Ayala, Jorge A.
AU - Uribe-Ramirez, Agustin R.
N1 - Publisher Copyright:
© 2017 Society of Thermal Engineers of Serbia.
PY - 2018
Y1 - 2018
N2 - The aim of this paper is to evaluate numerically the effect of varying the electrochemical model and its parameters on the performance and entropy generation of a mono-block-layer build (MOLB) type geometry of a solid oxide fuel cell. Particularly, the influence of the exchange of current density, the electrical conductivity of the electrodes and the electrolyte has been studied and the prediction of the thermodynamic irreversibility by means of an entropy generation analysis is considered. The numerical analysis consider a 3-D CFD model that takes into account the mass transfer, heat transfer, species transport, and electrochemical reactions. Several numerical simulations were performed and each contribution to the local entropy generation rate was computed. The results show different trends of the current density, temperature, species, activation loss, ohmic loss, and concentration loss along the fuel cell. Also, the results show strong variations of the local and global entropy generation rates between the cases analyzed. It is possible to conclude that the fuel cell performance and the prediction of thermodynamic irreversibility can be significantly affected by the choice of the electrochemical models and its parameters, which must be carefully selected.
AB - The aim of this paper is to evaluate numerically the effect of varying the electrochemical model and its parameters on the performance and entropy generation of a mono-block-layer build (MOLB) type geometry of a solid oxide fuel cell. Particularly, the influence of the exchange of current density, the electrical conductivity of the electrodes and the electrolyte has been studied and the prediction of the thermodynamic irreversibility by means of an entropy generation analysis is considered. The numerical analysis consider a 3-D CFD model that takes into account the mass transfer, heat transfer, species transport, and electrochemical reactions. Several numerical simulations were performed and each contribution to the local entropy generation rate was computed. The results show different trends of the current density, temperature, species, activation loss, ohmic loss, and concentration loss along the fuel cell. Also, the results show strong variations of the local and global entropy generation rates between the cases analyzed. It is possible to conclude that the fuel cell performance and the prediction of thermodynamic irreversibility can be significantly affected by the choice of the electrochemical models and its parameters, which must be carefully selected.
KW - CFD
KW - Electrochemical model parameters
KW - MOLB-type geometry
KW - Solid oxide fuel
KW - Thermodynamic irreversibility
UR - http://www.scopus.com/inward/record.url?scp=85045306078&partnerID=8YFLogxK
U2 - 10.2298/tsci151221127r
DO - 10.2298/tsci151221127r
M3 - Artículo
SN - 0354-9836
VL - 22
SP - 577
EP - 589
JO - Thermal Science
JF - Thermal Science
IS - 1
ER -