ISSN 2319-5347, ISI Impact Factor: 0.763

VOLUME 04  NO. 2 APRIL 2016:

Title:        Effect of Water Conductivity on the Generation of OH Radicals in High Frequency Underwater Capillary Discharge
Authors:     Muhammad Waqar Ahmed, Rai Suresh, Jong-Keun Yang, Sooseok Choi, H. J. Lee
Abstract:   The scope of this research work was to investigate the effect of water conductivity and bubbling of gas on physical and chemical properties of underwater plasma discharge. The effect of water conductivity and bubbling of gas as well as no gas on breakdown voltage, average electrical power of discharge pulses and generation of radicals were investigated and presented. The experimental parameters were composed of different conductivities (50- 350μS/cm), various inter-electrode gaps (1, 4, 7 and 10mm) and two different gas injection rates (0, 200 sccm). A flowing water (0.1 L/min) discharge was created in a quartz capillary tube (outer Φ=4mm, inner Φ=2mm, thickness = 1mm) by applying a high frequency (at 25 kHz) variable voltages (0-15kV) across tungsten electrodes (Φ=0.5mm) in pin to pin electrode configuration. The concentrations of radicalswere found high for highly conductive, argon injected and longer inter-electrode gap discharge.At higher conductivities along with argon gas injection, breakdown voltage was observed lowered and electrical power of discharge pulses higher.

Keywords:  High frequency Capillary discharge, Radicals, Conductivity, Emission spectrum
Pages:        28-34

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