A numerical model coupling the heat and gas species' transport processes in a tubular SOFC

被引:34
作者
Li, PW [1 ]
Schaefer, L [1 ]
Chyu, MK [1 ]
机构
[1] Univ Pittsburgh, Dept Mech Engn, Pittsburgh, PA 15261 USA
来源
JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME | 2004年 / 126卷 / 02期
关键词
conjugate; energy conversion; heat transfer; mass transfer; modeling;
D O I
10.1115/1.1667528
中图分类号
O414.1 [热力学];
学科分类号
摘要
A numerical model is presented in this work that computes the interdependent fields of flow, temperature, and mass fractions in a single tubular solid oxide fuel cell (SOFC). Fuel gas from a pre-reformer is considered to contain H-2, CO, CO2, H2O (vapor), and CH4, so reforming and shift reactions in the cell are incorporated. The model uses mixture gas properties of the fuel and oxidant that are junctions of the numerically obtained local temperature, pressure, and species concentrations, which are both interdependent and related to the chemical and electrochemical reactions. A discretized network circuit of a tubular SOFC was adopted to account for the Ohmic losses and Joule heating from the current passing around the circumference of the cell to the interconnect. In the iterative computation, local electrochemical parameters were simultaneously calculated based on the local parameters of pressure, temperature, and concentration of the species. Upon con vergence of the computation, both local details and the overall performance of the fuel cell are obtained. These numerical results arc important in order to better understand the operation of SOFCs.
引用
收藏
页码:219 / 229
页数:11
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