Abstract
The aim of this work was to present an effective method of generating an underwater capillary discharge at low power through gas injection (O2, air) and generating OH radicals. A flowing water (0.1 L/min) discharge was created in a quartz capillary tube (Φ = 4 mm outer; Φ = 2 mm inner; thickness = 2 mm) by applying a continuous negative DC voltage (0–4 kV) across tungsten electrodes (Φ = 0.5 mm) separated by a variable distance (1–2 mm) in the pin-pin electrode configuration. The air- and oxygen-injected capillary discharges at a constant water flow rate, similar gas injection variation rates, and two different interelectrode gaps were compared. A reduction in the breakdown voltage with increasing gas injection rate was shown. Compared to air, oxygen was proven to be more effective for generating an underwater discharge of a pulsating nature with the characteristics of high energy per pulse, higher power per pulse, short pulse width, and short pulse repetition rate. The emission spectrum of the oxygen-injected discharge showed a higher concentration of OH radicals than that of the air-injected discharge. The imaging diagnostic results showed that the discharge was brighter and more expanded when oxygen was added than it was when air was added.
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