Although conventionally utilized flow field designs have very different flow paths for delivery of the electrolyte in two dimensions; the channel depth seems to remain constant for the flow field studies reported so far. Considering the porous electrodes lie in parallel with the channel floors in most of the VRFB cell fixtures, it is believed that alterations of the channel depth throughout the length of the flow channels can help facilitate better transport of active species to the electrodes. Motivated by this, various forms of channel obstructions and ramped flow field designs have been investigated to understand the effect of channel depth and delivery of electrolytes on the power density of the VRFBs. Results have shown significant improvements in power density (up to 90%) with the addition of alterations to the channel depth with minor (10%) or no change in pumping losses. These findings suggests that engineering of the flow field designs in all three dimensions can help further improve the power density of VRFBs.
 Agar, E., Dennison, C.R, Knehr, K.W., Kumbur, E. C., J. Power Sources, 2013, 225, 89-94.
 Kumar, S., Jayanti, S., J. Power Sources, 2016, 307, 782-787.
 Dennison, C.R., Agar, E., Akuzum, B., Kumbur, E.C., 2016, J. Electrochem. Soc., 163, A5163-A5169.