Modeling and synchrotron imaging of droplet detachment in gas channels of polymer electrolyte fuel cells

Research output: Contribution to journalArticle

Abstract

A computational fluid dynamics model of a channel (one liquid inlet, one liquid inlet and one two-phase outlet), applicable for PEFC gas channel water transport, is developed. A volume of fluid approach is used to study the two-phase flow behavior (interface-resolved) inside the gas channel, including the surface of GDL (gas diffusion layer), which is verified by experimental results from synchrotron based X-ray radiography and tomography imaging. A reasonably good agreement is found between the model and the measurements in terms of droplet dynamics, shape, and size. The channel height strongly influences the droplet transport behavior, with the droplet being attached to the GDL surface, as well as to the wall on the opposite side to the GDL at the same time for the shallowest channel (150 μm). The GDL contact angle influences the droplet size, with an increased GDL contact angle creating smaller droplets.

Details

Authors
  • M. Andersson
  • A. Mularczyk
  • A. Lamibrac
  • S. B. Beale
  • J. Eller
  • W. Lehnert
  • F. N. Büchi
Organisations
External organisations
  • Jülich Research Centre
  • Paul Scherrer Institute
  • Queen's University
  • RWTH Aachen University
  • JARA-HPC
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Energy Engineering

Keywords

  • Contact angle, GDL surface, Modeling, Polymer electrolyte fuel cells, Tomography imaging
Original languageEnglish
Pages (from-to)159-171
Number of pages13
JournalJournal of Power Sources
Volume404
Publication statusPublished - 2018 Nov 15
Publication categoryResearch
Peer-reviewedYes