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Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
Saw a video via the TCML that showed unusual bulls eye effects where the arc hits the water so thought I would revisit the phenomenon of water arcs again.
Here are a few with (initially) deionised water. I used a flyback with ZVS driver but best results were with a MOT doubler at about 4kv with 10kV trigger. The water is the positive and electrode negative. The wire electrode is 2mm diameter for scale.
There was no post processing other than cropping. I took well over 200 pics with many variations in magnetic fields, polarities, water electrolyte content, power and frequency. No sign of a bulls eye effect but a slower still or video camera could be averaging some of the effects. Probably, however it is the flyback waveform which may be causeing it. The ZVS is sine wave but the one generating the bulls eye was a halfbridge.
First is A Flyback arc over a submerged magnet. Second is a MOT supply with a green copper tinge. Note the pattern of the arc where it hits the water surface. Third pic is similar with nice symmetry. Fourth pic is without the copper tinge. Fifth is an old photo from an older camera which is not as fast and blurs the rapidly changing detail.
Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
I am not sure about the current except I smoked the smaller of the mismatched IGBT's in my ZVS driver. Also got the dropping resistor in my MOT supply hot enough to get a burning smell. Because it is out of sight in an MO oven shell, I have put wax on the resistor. Hopefully that starts to smell before the resistor goes up. I wasn't very scientific in my data collection with this setup. It is MOT doubled and run at perhaps 50 - 80% power in short runs. I would guess 100mA.
The deionised water doesn't last long with the sparks. Also ions are generated from the Nickel coated NIB magnet in contact with the Aluminium electrode as bubbles start to form on it.
First pics is another variation in the purple contact point. Second pic shows a hazy flyback arc with polarity around the "wrong" way which just wanders over the surface in its own breeze.
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The strangeness of water arcs.
