Importance of channel dimension for flow-electrode flowing in flow-electrode capacitive mixing (F-CapMix): Evaluation of net power density under high-pressure-drop conditions
- Authors
- Kim, Donghyun; Kwon, Hwabhin; Cho, Geun-Ho; Kim, Haeun; Seo, Haeun; Jung, Yeon-Gil; Choi, Jiyeon; Kim, Hanki; Yoo, Jungjoon; Lee, Dongsoo; Hwang, Insung; Paik, Ungyu; Song, Taeseup; Park, Heesung; Yang, SeungCheol
- Issue Date
- Jun-2022
- Publisher
- Elsevier B.V.
- Keywords
- Capacitive mixing; Flow-electrode; Flow channel; Pressure drop; Net power
- Citation
- Separation and Purification Technology, v.290, pp.1 - 10
- Indexed
- SCIE
SCOPUS
- Journal Title
- Separation and Purification Technology
- Volume
- 290
- Start Page
- 1
- End Page
- 10
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/170131
- DOI
- 10.1016/j.seppur.2022.120859
- ISSN
- 1383-5866
- Abstract
- Flow-electrode capacitive mixing (F-CapMix) utilizes ion adsorption/desorption on active materials in the flow-electrode to harvest salinity gradient power. In order to facilitate flow-electrode flow in the F-CapMix unit cell, the current collectors should include a meandering flow channel for the cell assembly and should facilitate efficient electron transport between them and the flow-electrode active materials. This study evaluates the F-CapMix performance variation and pumping power of the flow-electrode and feed water depending on flow channel depth. It was found that both parameters increased as the cross-sectional area of the flow channel narrowed. This result was due to the increasing linear velocity of the flow-electrode, which itself was associated with the narrowing cross-sectional area. The maximum gross power densities of the F-CapMix increased in a parabolic shape with respect to the flow-electrode linear velocity increase. (0.68 → 0.83 → 0.86 → 1.03 → 1.14 W/m2) On the contrary, pumping power densities of the flow-electrode increased linearly (2.22 → 2.98 → 3.51 → 5.93 → 19.67 W/m2) with linear velocity increment of the flow-electrode. Further, the F-CapMix net power density was negatively affected by the increasing linear velocity of the flow-electrode (net power density variation from −2.06 to −19.10 W/m2), likely owing to the higher pumping power density required due to the narrower flow channel. This study verifies the importance of securing an appropriate cross-sectional area of the meandering flow channel to maintain positive net power of the F-CapMix.
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