|Title:||Flow field optimization for proton exchange membrane fuel cells with varying channel heights and widths||Authors:||Wang X.-D.
|Keywords:||Flow field design;Optimization;Serpentine flow field;Simplified conjugate-gradient method;Sub-rib convection||Issue Date:||2009||Journal Volume:||54||Journal Issue:||23||Start page/Pages:||5522-5530||Source:||Electrochimica Acta||Abstract:||
The optimal cathode flow field design of a single serpentine proton exchange membrane fuel cell is obtained by adopting a combined optimization procedure including a simplified conjugate-gradient method (SCGM) and a completely three-dimensional, two-phase, non-isothermal fuel cell model. The cell output power density P cell is the objective function to be maximized with channel heights, H 1 -H 5 , and channel widths, W 2 -W 5 as search variables. The optimal design has tapered channels 1, 3 and 4, and diverging channels 2 and 5, producing 22.51% increment compared with the basic design with all heights and widths setting as 1 mm. Reduced channel heights of channels 2-4 significantly enhance sub-rib convection to effectively transport oxygen to and liquid water out of diffusion layer. The final diverging channel prevents significant leakage of fuel to outlet via sub-rib convection from channel 4. Near-optimal design without huge loss in cell performance but is easily manufactured is discussed. ? 2009 Elsevier Ltd. All rights reserved.
|Appears in Collections:||化學工程學系|
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.