| Visualization of liquid water movement on the micro sub-channels of flow paths in a proton exchange membrane fuel cell cathode separator
Sanghoon Lee, Dong-Ho Rhee, Won Hyeng Pyen, Hyung Hee Cho*
The Journal of Mechanical Science and Technology, vol. 25, no. 4, pp.957-961, 2011
Abstract : This paper introduces micro sub-channels to manage the liquid water in cathode flow paths in order to enhance the performance of
proton exchange membrane fuel cells (PEMFCs) under high current density operating conditions. By visualization experiments, the capillary
force of the micro sub-channels proves its ability to spread the liquid water on the main flow path, and consequently the main flow
path possesses the space required to deliver air. Also, the advantages and disadvantages of various patterns of micro sub-channels were
analyzed by comparing the liquid water movements on the main flow paths and the micro sub-channels. Finally, measuring the performance
of a test PEMFC with micro sub-channels, we verified the performance enhancement that occurs in PEMFCs through the use of
micro sub-channels.
Keyword : Performance enhancement of PEMFC; Flooding; Micro sub-channel; Liquid water; Capillary force |
