Work

Numerical investigation on the optimized design and wall film behavior of gas-water separators in the proton exchange membrane fuel cell

Year: 2025

Type: article

Abstract: This study numerically investigates baffle gas-water separators for PEMFC systems to enhance water removal and reduce pressure loss. A coupled discrete phase model and Eulerian wall film model simulate multiphase interactions, focusing on wall film behavior and droplet dynamics. Key design parameters, including baffle count, spacing, and the vertical distance from the inlet to the lowest baffle, are systematically analyzed to reveal how geometric optimization influences flow turbulence and wall film re-entrainment. Results show that reducing the vertical distance suppresses turbulence intensity, stabilizes flow, and limits secondary droplet formation. Droplet rebound primarily generates fine droplets, whereas shear-induced film stripping leads to larger droplets. An optimized three-baffle configuration significantly reduces film accumulation and instability-driven re-entrainment, achieving high separation efficiency with a 46 % reduction in pressure loss compared to a six-baffle design. These findings offer an efficient solution for PEMFC water management.

Source: International Journal of Hydrogen Energy

DOI: 10.1016/j.ijhydene.2025.152506

Authors: Jiamei Fan, Lili Lu, Guodong Liu, Chong Yao, Jiangfeng Dong, Guanghui Xu

Institutions: Harbin Engineering University, China North Industries Group Corporation (China)

Language: English

Topic: Fuel Cells and Related Materials

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

SDGs: Affordable and clean energy, Clean water and sanitation

Open Access status: hybrid

Estimated APC paid: $3,730