In this paper a Particle Image Velocimetry (PIV) measurement technique and it's application for the flow patterns
measurements in our experiments is presented. Present PIV system consist of double Nd:YAG laser with pulse energy
of 50 mJ, optics for transmission and formation a laser beam, two CCD cameras (Kodak MegaPlus ES-1.0 and
FlowSense M2), Dantec processor PIV 1100 and PC computer with FlowManager software. The maximum measured
area is 0.5 m2 and flow velocity in the range of 0-300 m/s. So far, the PIV measurements were carried out in
hydrodynamic and transonic ducts, corona discharge reactors, electrostatic precipitator models and a microwave torch
discharge reactor in The Szewalski Institute of Fluid Flow Machinery, Polish Academy of Sciences in Gdansk. The PIV
system was used also for the measurements of the velocity fields round the hull of the ship model in The Ship Design
and Research Centre in Gdansk.
In this work results of the laser visualization of the gas bubbles flow in a needle-to-cylinder pulsed discharge reactor
filled with distilled water are presented. The experimental setup consisted of a pulsed discharge reactor, high voltage
supply, CuBr laser, and Video camera. In the glass reactor bottom a stressed needle or a set of needles were placed.
The grounded cylinder was set 45 mm above the needle electrode(s). The pulses of positive voltage (up to 31 kV)
with a repetition rate of 50 Hz were used. A laser beam emitted from the CuBr laser was formed, using a telescope,
into the laser sheet, which crossed the reactor in a selected vertical and horizontal plains. It was observed that during
the positive pulsed discharge in water the bubbles production and the streamer size increased with increasing applied
voltage. Large vortices generated during the discharge distributed bubbles in the whole reactor volume, providing
good mixing and distribution of active species. The more needles were used, the larger number of bubbles were
observed.
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