Page 101 - Introduction to Transfer Phenomena in PEM Fuel Cells
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90 Introduction to Transfer Phenomena in PEM Fuel Cells
3.3. Mass transfer by convection
The reactive gases in the flow channels have the concentration (C 0). They
will be transported, by convection, to the diffusion layers to be well
distributed at the surface of the electrodes. The concentration then becomes
(C s). Figure 3.3 shows the mass transfer phenomena along the anode side of
the fuel cell [SPI 07].
Convective mass transfer for this fuel cell is written as [LI 06]:
=
h (C −
mA elec m 0 C ) [3.13]
S
where:
– A elec is the electrode surface;
– h m is the mass transfer coefficient.
Figure 3.3. Mass transfer at the anode
