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Time- and space-resolved LIF measurement of the concentration of OH radicals generated by surface barrier discharge emerging from liquid water
Plasma Sources Science and Technology ( IF 3.193 ) Pub Date : 2019-10-16 , DOI: 10.1088/1361-6595/ab3e0d
Jan Voráč, Petr Synek, Pavel Dvořák and Tomáš Hoder

The concentration of OH radicals has been mapped in three-dimensions by scanning planar laser-induced fluorescence (LIF) in the vicinity of surface barrier discharge emerging from liquid water and propagating along a fused silica dielectric tube in argon. The concentration peaked in the region of active discharges near the water level at the value of 1.5 × 10 21 m −3 and decreased with the distance on a characteristic length of ∼0.4 mm, which suggests that the OH transport is dominated by diffusion. The OH production increases with power input ( P ) until it saturates for P > 0.75 W. It has been observed that the repetitive discharge appearance at preferred locations can be changed to stochastic (i.e. macroscopically homogeneous) by increasing the thickness of deionized water covering the earthed electrode.
更新日期:2019-10-17

 

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