Three-dimensional lattice Boltzmann simulation of liquid water transport in porous layer of PEMFC

Bo Han, Meng Ni, Hua Meng

Research output: Journal article publicationJournal articleAcademic researchpeer-review

19 Citations (Scopus)

Abstract

A three-dimensional two-phase lattice Boltzmann model (LBM) is implemented and validated for qualitative study of the fundamental phenomena of liquid water transport in the porous layer of a proton exchange membrane fuel cell (PEMFC). In the present study, the three-dimensional microstructures of a porous layer are numerically reconstructed by a random generation method. The LBM simulations focus on the effects of the porous layer porosity and boundary liquid saturation on liquid water transport in porous materials. Numerical results confirm that liquid water transport is strongly affected by the microstructures in a porous layer, and the transport process prefers the large pores as its main pathway. The preferential transport phenomenon is more profound with a decreased porous layer porosity and/or boundary liquid saturation. In the transport process, the breakup of a liquid water stream can occur under certain conditions, leading to the formation of liquid droplets inside the porous layer. This phenomenon is related to the connecting bridge or neck resistance dictated by the surface tension, and happens more frequently with a smaller porous layer porosity. Results indicate that an optimized design of porous layer porosity and the combination of various pore sizes may improve both the liquid water removal and gaseous reactant transport in the porous layer of a PEMFC.
Original languageEnglish
Article number17
JournalEntropy
Volume18
Issue number1
DOIs
Publication statusPublished - 1 Jan 2016

Keywords

  • Lattice Boltzmann model
  • Liquid saturation
  • Microstructure reconstruction
  • Porosity
  • Two-phase transport

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this