Influence of cathode flow pulsation on performance of proton-exchange membrane fuel cell

Performance of a PEM fuel cell with oscillating air flow velocity: A modeling study based on cell impedance

“…(28) φ 2 1, we see that the dependence on k v vanishes. From Figure 2 is is clear that the effect of velocity modulation is most pronounced at λ 2, which agrees with the experimental results of Kim et al 13 .…”

“…If the relative amplitudes of velocity and potential oscillations are equal, the resistivity R h vanishes. These results explain experimental findings of Kim et al 13 and Hwang et al 14 who demonstrated dramatic improvement of PEM fuel cell performance under oscillating air flow velocity.…”

“…Under certain relation between velocity and potential oscillation amplitudes, the resistivity of oxygen transport in the channel vanishes. This result supports the general conclusion of Kim et al 13 and Hwang et al 14 that flow pulsation improves oxygen transport in the cell; in this work, we demonstrate the mechanism of this improvement. Further, the model gives a relation between the amplitudes of velocity and potential oscillations, at which the oxygen transport loss in the channel vanishes.…”

“…The effect of flow pulsation on the cell performance was more pronounced at lower air flow rates, and the cell performance increased with the amplitude of velocity pulsation 13 . The gain in performance has been attributed to improvement of oxygen transport through the cell due to flow pulsation 13,14 .…”

“…Kim et al 13 and later Hwang et al 14 experimentally demonstrated dramatic improvement of PEMFC performance under oscillating air flow velocity in the channel. The effect of flow pulsation on the cell performance was more pronounced at lower air flow rates, and the cell performance increased with the amplitude of velocity pulsation 13 . The gain in performance has been attributed to improvement of oxygen transport through the cell due to flow pulsation 13,14 .…”