고분자전해질형 연료전지의 유로 채널 모사를 통한 단일 액적의 불안정성 관찰

Investigation on the Liquid Water Droplet Instability in a Simulated Flow Channel of PEMFC

  • 김보경 (서울대학교 기계항공공학부 대학원) ;
  • 김한상 (서울대학교 기계항공공학부) ;
  • 민경덕 (서울대학교 기계항공공학부)
  • Kim, Bo-Kyung (Department of Mechanical and Aerospace Engineering, Seoul National University) ;
  • Kim, Han-Sang (Department of Mechanical and Aerospace Engineering, Seoul National University) ;
  • Min, Kyung-Doug (Department of Mechanical and Aerospace Engineering, Seoul National University)
  • 발행 : 2008.03.31

초록

To investigate the characteristics of water droplet on the gas diffusion layer from both top-view and side-view of the flow channel, a rig test apparatus was designed and fabricated with prism attached plate. This experimental device is used to simulate the growth of single liquid water droplet and its transport process with various air flow velocity and channel height. The contact angle hysteresis and height of water droplet are measured and analyzed. It is found that droplet tends towards to be instable by decreasing channel height, increasing flow velocity or making GDL more hydrophobic. Also, the simplified force balance model matches with experimental data only in a restricted range of operating conditions and shows discrepancy as the air flow velocity and channel height increases.

키워드

참고문헌

  1. R. O'Hayre, S.-W. Cha, W. Colella and F. B. Prinz, FUEL CELL Fundamentals, Wiley, New York, 2005
  2. S. Litster, D. Sinton and N. Djilali, "Ex Situ Visualization of Liquid Water Transport in PEM Fuel Cell Gas Diffusion Layers," J. Power Sources, Vol.154, pp.95-105, 2006 https://doi.org/10.1016/j.jpowsour.2005.03.199
  3. N. Pekula, K. Heller, P. A. Chuang, A. Turhan, M. M. Mench, J. S. Brenizer and K. Ünlü, "Study of Water Distribution and Transport in a Polymer Electrolyte Fuel Cell Using Neutron Imaging," Nucler Instruments & Methods in Physics Research, Vol.542, pp.134-141, 2005 https://doi.org/10.1016/j.nima.2005.01.090
  4. K. Tuber, D. Pocza and C. Hebling, "Visualization of Water Buildup in the Cathode of a Transparent PEM Fuel Cell," J. Power Sources, Vol.124, pp.403-414, 2003 https://doi.org/10.1016/S0378-7753(03)00797-3
  5. K. S. Chen, M. A. Hickner and D. R. Noble, "Simplified Models for Predicting the Onset of Liquid Water Droplet Instability at the Gas Diffusion Layer/Gas Flow Channel Interface," Int. J. Energy Reserch, Vol.29, pp.1113-1132, 2005 https://doi.org/10.1002/er.1143
  6. E. C. Kumbur, K. V. Sharp and M. M. Mench, "Liquid Droplet Behavior and Instability in a Polymer Electrolyte Fuel Cell Flow Channel," J. Power Sources, Vol.161, pp.333-345, 2006 https://doi.org/10.1016/j.jpowsour.2006.04.093
  7. U. Pasaogullari and C.-Y. Wang, "Two-Phase Modelling and Flooding Prediction of Polymer Electrolyte Fuel Cells," J. Electrochem. Soc., Vol.152. pp.A380-A390, 2005 https://doi.org/10.1149/1.1850339