The amount of liquid present in a g

The amount of liquid present in a gas channel is an important parameter affecting the two-phase pressure drop. St-Pierre [25] presents an excellent review of the methods used to detect water in gas channels. Although these techniques are very useful, implementing them in a working fuel cell is quite challenging. Sergi and Kandlikar [24] employed high speed visualization to obtain instantaneous and simultaneous water distributions in both anode and cathode channels of an in situ fuel cell. Using image processing, they presented a water coverage ratio parameter. However, before such techniques can be integrated with pressure droppredictions, flow fields with larger visualization access and extensive in situ data are needed.