CuSO₄水溶液中の陽イオン電流に誘起されるEHD流れの評価

抄録

It is known that ion transport phenomena in non-aqueous solutions cause to drive electrohydrodynamic (EHD) flows. Some tens of kV of applied voltages are required to inject electrical charges that drag liquid flows. On the other hand, there have been difficulties to use EHD flows in aqueous solutions, because water electrolysis makes the solutions be unstable in such high voltage conditions. We supposed a method to rectify cationic and anionic currents in liquids that successfully drove EHD flows with low bias voltages, where electrolyte solutions were polarized across an ion-exchange membrane placed between the two liquid phases. In this study, we introduce another technique in which flow channels are arranged in the upper and lower channel with a difference in the resistivity. In CuSO4 solutions, Cu2+ ions have a role of charge carriers when applying electric voltages via Cu electrodes. EHD flows driven by ionic currents in CuSO4 aqueous solutions are generated by applying electric voltages within 10 V and the three-dimensional velocity profiles are clarified.