Due to electric field leakage across sharp corners, the irrotational character of Ohmic electroosmotic flow is violated. Instead, we demonstrate experimentally and theoretically evidence of electrolyte depletion and vortex separation in electroosmotic flow around a junction between wide and narrow channels. When the penetration length of the electric field exceeds the width of the narrow channe...

Numerous natural and artificial streams, including those for irrigation ditches, wastewater treatment facilities, conveyance structures fish movement, have open channel confluences. The flow dynamics at around the junction are intricate; in particular, immediately downstream of junction, creates a zone separation on inner wall along with secondary recirculation patterns. structure this complica...