
436 Fuel Cells
area and effective electron and heat dissipation by conduction through the
land area. The ratio of contact area to land area is dened by the geometrical
parameters such as the height, h, and width, w, of the channel and the height
of the land area, l, as shown in Figure 10.11a. The channel geometry can be of
any shape such as square or rectangle of different aspect ratios or trapezoid
as shown in Figure 10.11b.
Bipolar
plates
Reactant
gas flow
MEA
Bipolar
plates
Reactant
gas flow
(a) (b)
Electrode
Bipolar
plates
Gas transport
Heat transport
Gas contact area
Land area
Reactant
gas flow
FIGURE 10.10
MEA and bipolar plate ...