Scaling analysis of diffusion–reaction process in proton exchange membrane fuel cell with the second Damköhler number
发布时间：2024-10-22
点击次数：
- 影响因子：
- 13.3
- DOI码：
- 10.1016/j.cej.2023.143011
- 发表刊物：
- Chemical Engineering Journal
- 关键字：
- PEM fuel cell; Scaling analysis; Damkohler number; Flow field; Diffusion–reaction process
- 摘要：
- Diffusion-reaction coupling process in flow fields dominates the performance of proton exchange membrane fuel cell. This paper defined a new second mechanistic Damkohler ¨ number (DaII,mech) to compare the similarity and efficiency between different flow fields. Dimensionless model and numerical model were combined together to analyze the single channels, parallel and single-serpentine channels. According to trends of DaII,mech curves over current density, the diffusion–reaction interaction can be divided into three states: reaction-enhanced (DaII,mech ~ 1000), transition and diffusion-limited states (DaII,mech ~ 100). With the enlargement of active area, almost the same Damkohler ¨ curves and contours demonstrate the similarity of diffusion–reaction process in single channel and parallel channels. But there is no obvious scaling invariance over active area for single-serpentine channels due to its asymmetric structure. A new efficiency evaluation criterion (EEC) based on Damkohler ¨ number and Euler number is proposed to comprehensively compare the fuel cell performance. The EEC curves also present three-state characteristics. And the EEC values of parallel channels are several orders of magnitude higher than that of single-serpentine channels. This scaling method is expected to be further generalized to other flow fields and operating conditions to accelerate the fuel cell design and optimization.
- 论文类型：
- 期刊论文
- 学科门类：
- 工学
- 一级学科：
- 化学工程与技术
- 文献类型：
- J
- 卷号：
- 465
- 页面范围：
- 143011
- 是否译文：
- 否
- 发表时间：
- 2023-01-01
- 收录刊物：
- SCI