Turbulent flow measurement in the vicinity of a cation-selective membrane utilizing the Doppler shift of scattered laser radiation

An anemometric method to measure the velocity of fluid flow in the vicinity of a cation-selective membrane is described. It is shown that the turbulent phenomenon which develops on the depletion side of the membrane, beyond the critical current density point, is confined to a space region of ≃130 μm from the membrane surface; this turbulence is strongly coupled to the dissipation process of electric energy in the depletion region.