Characterization and modeling of the hydrodynamic behavior in the filter-press-type FM01-LC electrochemical cell by direct flow visualization and residence time distribution

In this paper, the hydrodynamics in the FM01-LC electrolyzer is studied by flow visualization and residence time distribution (RTD). Divided and undiv ided modes are studied by direct visualization, with two injection points. The use of foams instead of turbulence promoters as well as that of electro des without turbulence promoters is tested. In the membrane-partitioned-mod e configurations, radial and axial dispersions are observed. Dispersion is drastically extended in case of empty channel flow. A high-flow asymmetry i s generally induced by the flow distributors. RTD is implemented in the who le cell and in the reaction area. The reactor working with a plane plate al one gives a rather constant, low Peclet number, Pe, whatever the tested flo w rates. The low Pe values denote an important axial dispersion. The use of turbulence promoters or foams induces a significant increase of Pe, giving plug flow character.