Abstract
Capillary discharge investigated by this work was created in the reactor using positive half-cycle of AC high voltage up to 2 kV. Electric field created between two electrodes which were separated by the dielectric ceramic barrier with a symmetrical cylindrical hole (diameter of 1 mm, length of 5 mm) in it. When voltage reached the value sufficient for liquid breakdown, the discharge appeared initially in bubbles of evaporated solution in the hole vicinity and spread further into the liquid volume. After the rise of discharge, two kinds of plasma channels (streamers) propagated towards electrodes from the pin-hole: longer positive streamers on the side with the cathode (analogically as in the positive corona discharge) and shorter negative streamers (like negative corona discharge). These streamer kinds differed especially in the energy dissipation originating from different electron velocities in plasma channels due to electron collisions with positive particles accelerating or decelerating electron avalanches and it gave rise of a significant pump effect.
Highlights
Electrical discharges in electrically conductive liquids can be generated in several ways and various electrode configurations have been studied
Recent research showed that periodic plasma generation in an asymmetrical capillary induces a flow of liquid between the two vessels, which might be utilized to design a micro pump [3]
This work presents our research focused on the pump effect using the symmetrical geometry of the capillary
Summary
Electrical discharges in electrically conductive liquids can be generated in several ways and various electrode configurations have been studied. Recent research showed that periodic plasma generation in an asymmetrical capillary induces a flow of liquid between the two vessels, which might be utilized to design a micro pump [3]. This work presents our research focused on the pump effect using the symmetrical geometry of the capillary.
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