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Membrane Water Treatment
  Volume 7, Number 2, March 2016, pages 115-126

Analysis of newly designed CDI cells by CFD and its performance comparison
Se Hwan Kwon and Ji Won Rhim

    In this study, computational fluid dynamics (CFD) analysis was conducted to investigate the flow pattern and to find the occurrence of dead zones in an existing capacitive deionization (CDI) cell. Newly designed cells—specifically designed to avoid dead zones —were analyzed by CFD in accordance with the flow rates of 15, 25 and 35 ml/min. Next, the separation performances between the existing and newly designed cell were compared by conducting CDI experiments in terms of salt removal efficiency at the same flow rates. Then, the computational and experimental results were compared to each other. The salt removal efficiencies of the hexagon flow channel 1 (HFC1) and hexagon flow channel 2 (HFC2) were increased 88-124% at 15 ml/min and 49-50% at 25 ml/min, respectively. There was no difference between the existing cell and the foursquare flow cell (FFC) at 35 ml/min.
Key Words
    capacitive deionization (CDI); dead zone; flow channel; computational fluid dynamics (CFD); cell design
Department of Advanced Materials and Chemical Engineering, Hannam University, 1646 Yuseongdae-ro, Yuseong-gu, Daejeon 34054 Korea.

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