Flow field structure design modification with helical baffle for proton exchange membrane fuel cell

• Published in: Energy conversion and management 2022-10, Vol.269, p.116175, Article 116175
• Main Authors: Liu, Qingshan, Lan, Fengchong, Chen, Jiqing, Wang, Junfeng, Zeng, Changjing
• Format: Article
• Language: English
• Subjects: Anisotropic properties; CL agglomerate model; Helical semicircular baffle; Mass and heat transport; PEMFC
• ISSN: 0196-8904; 1879-2227
• DOI: 10.1016/j.enconman.2022.116175

•A semicircular baffle flow field with helical structure is proposed.•Considering the anisotropic mass and heat transfer properties of the porous layers.•Considering the actual agglomerate structure of the cathode catalyst layer.•The optimized flow field increases the fuel cell’s net power density by 11.42 %. To effectively improve the fuel cell (FC) mass transport capacity, a new flow field (FF) design with helical baffle at the cathode is proposed, which facilitates gas flow and mass transfer in both through- and in-plane directions. To fully understand the influence of various design parameters on the FC performance, a series of studies were carried out with a semicircular baffle as an example. The effect of the baffle structure on the complex heat and mass transport process is studied in detail to obtain the optimal baffle structure parameters. To simulate the complete transport process, a three-dimensional, multiphase, non-isothermal steady-state model was developed, embedding the anisotropic transport properties caused by the porous layer structures and the heterogeneous model of the actual agglomerate structure of the catalyst layer in the model. The results show that the helical baffles induce cross flow under the ribs while inducing forced convection, enhancing the oxygen supply in both directions. The FF structure with baffle height and pitch of 0.4 mm and 1.0 mm respectively has the maximum net power density. Taking the relative humidity = 50 % and 100 % as an example, the net power density is increased by 11.42 % and 5.72 % respectively compared with the original FF.