声明
致谢
List of Symbols
Abbreviations
Chapter 1 Introduction
1.1 Background
1.2 Fundamental Principles in PEMFC
1.3 Electrode Components
1.3.1 Bipolar Plate
1.3.2 Gas Diffusion Layer
1.3.3 Microporous Layer
1.3.4 Catalyst Layer
1.4 Polarization Curve
1.5 Objectives and Scope of the Dissertation
Chapter 2 Literature Survey
2.1 Two-phase Flow in Flow Channel
2.2 Two-phase Flow in GDL
2.2.1 Liquid Water in GDL
2.2.2 Liquid Water in Mixed-wettability GDL
2.2.3 Liquid Water in Perforated GDL
2.2.4 Oxygen Diffusion in GDL
2.3 Full-cell PEMFC Multiphase Models
2.4 Summary
Chapter 3 DNS of Two-phase Turbulent Flow in Channel
3.1 Model Development
3.1.1 Single-phase Flow
3.1.2 Two-phase Flow
3.1.3 Boundary and Initial Conditions
3.1.4 Numerical Procedures
3.2 Model Validation
3.2.1 Laminar Flow
3.2.2 Turbulent Flow
3.3 Results and Discussion
3.3.1 Comparison of Laminar, Turbulent k-ε and DNS Models
3.3.2 Effect of Droplet Location
3.3.3 Interaction of Droplets
3.4 Summary
Chapter 4 Pore-scale Modeling of Two-phase Flow in GDL
4.1 GDL Reconstruction
4.2 Liquid Water in GDL
4.2.1 Computational Domain, Boundary and Initial Conditions
4.2.2 Boundary and Initial Conditions
4.2.3 Numerical Procedures
4.2.4 Local Porosity
4.2.5 Water Through-plane Distribution
4.2.6 Averaged Water Saturation
4.2.7 Water Dynamics
4.3 Liquid Water in Mixed-wettability GDL
4.3.1 Computational Domain
4.3.2 Boundary and Initial Conditions
4.3.3 Numerical Procedures
4.3.4 Effect of PTFE Loading
4.3.5 Effect of PTFE Drying Methods
4.4 Summary
Chapter 5 Pore-scale Modeling of Oxygen Diffusion in GDL
5.1 Oxygen Diffusion Model in GDL
5.2 Effective Oxygen Diffusivity in GDL
5.2.1 Computational Domain
5.2.2 Boundary and Initial Conditions
5.2.3 Numerical Procedures
5.2.4 Effective Diffusivity in Dry GDL
5.2.5 Effective Diffusivity in Wet GDL
5.3 Liquid Water Dynamics in Perforated GDL
5.3.1 Computational Domain
5.3.2 Boundary and Initial Conditions
5.3.3 Numerical Procedures
5.3.4 Effect of Layer Thickness
5.3.5 Effect of Perforation Diameter
5.3.6 Effect of Perforation Location
5.3.7 Effect of Perforation Perimeter Wettability
5.4 Oxygen Diffusion in Perforated GDL
5.5 Summary
Chapter 6 3D Full-cell PEMFC Multiphase Model in OpenFOAM
6.1 Physical Problem
6.2 Governing Equations
6.3 Source Terms
6.4 Boundary and Initial Conditions
6.5 Numerical Procedures
6.6 Model Validation
6.7 Effect of Inlet Relative Humidity
6.7.1 Anode Inlet
6.7.2 Cathode
6.8 Volume-average and Pore-scale PEMFC Models
Chapter 7 Summary and Future Works
参考文献
Published Papers, Research Projects, Honors and Awards
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