Two-phase flow pressure drop hysteresis in an operating proton exchange membrane fuel cell |
| |
Authors: | Ryan Anderson David P Wilkinson Xiaotao Bi L Zhang |
| |
Affiliation: | a Department of Chemical and Biological Engineering, University of British Columbia, 2360 East Mall Vancouver, BC, Canada V6T 1Z3 b Clean Energy Research Centre, University of British Columbia, 2360 East Mall Vancouver, BC, Canada V6T 1Z3 |
| |
Abstract: | Two-phase flow pressure drop hysteresis was studied in an operating PEM fuel cell. The variables studied include air stoichiometry (1.5, 2, 3, 4), temperature (50, 75, 90 °C), and the inclusion of a microporous layer. The cathode channel pressure drops can differ in PEM fuel cells when the current density is increased along a path and then decreased along the same path (pressure drop hysteresis). Generally, the descending pressure drop is greater than the ascending pressure drop at low current densities (<200 mA cm−2), and the effect is worse at low stoichiometries and low temperatures. The results show that the hysteresis occurs with or without the inclusion of a microporous layer. Initial results show a modified Lockhart-Martinelli approach seems to be able to predict the two-phase flow pressure drop during the ascending path. The results compare well with photographs taken from the cathode flow field channel of a visualization cell. |
| |
Keywords: | Two-phase flow Hysteresis PEM fuel cell Water management |
本文献已被 ScienceDirect 等数据库收录! |
|