Velocity Measurement of EHD Flow Produced by Pin-Multi Concentric Ring electrodes Generator

摘要

Study of EHD flow by using corona discharge generator has been conducted. Corona discharge was generated by using of pin to multi concentric rings (P-MCR) and pin to single ring (P-SR) electrodes configurations. The pin needle was made by stainless steel with a length of 50 mm and a tip diameter of 0.14 mm. The multi-ring electrodes were constructed by three concentric rings iron and its connected one and each other. The diameters of concentric rings were 24 mm, 16 mm and 8 mm and each ring has width of 2 mm and thickness of 3 mm. Single ring electrode has a diameter, width and thickness respectively 24 mm, 3 mm and 2 mm. EHD was generated by using a DC high voltage of 10 kV. Pin as an active electrode of corona discharge and concentric rings multi/single ring electrodes as ions collector and passive electrodes. We measured the velocity of EHD flow P-MCR and P-SR. The velocity of EHD flow was measured by a hot-wire anemometer. We found that the velocity of EHD flow with point to multi-ring concentric electrodes larger than a point to single ring electrode. The measurement of velocity for two cases of electrodes configuration were limited at the certain voltage due to breakdown and arc phenomena. The maximum velocity of the of EHD flow using a pin-multi rings concentric was 0.7 m/s at a voltage of 6 kV.