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PEM Fuel Cells by Ken S. Chen, Yun Wang

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6.5 CHAPTER SUMMARY

This chapter delineates the critical two-phase flow phenomena in PEM fuel cells, which occur in three major components, namely gas diffusion layers (GDLs)/microporous layers (MPLs), catalyst layers (CLs), and gas flow channels (GFCs). Several key points of this chapter are summarized as follows:

In GDLs/MPLs and CLs, the presence of liquid water hinders the transport of gaseous reactants, and it additionally reduces the active surface area for the HOR and ORR reactions in CLs; the multiphase mixture formulation is widely adopted to model the two-phase flow in PEM fuel cells. In homogeneous GDLs, the capillary action can be treated as “diffusion” (which results in liquid saturation varying monotonically within GDL), whereas ...

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