On Nov 4, 2009, at 5:17 AM, Abd ul-Rahman Lomax wrote:
At 01:52 AM 11/4/2009, Horace Heffner wrote:
I find it concerning that the sound track on the film sounds very
much like an electrospark experiment. It sounds like cavitation. The
noise shows up when the cathode heats up, just like electrospark. I
eventually started heating up my cells to boiling before starting (I
was running a boiloff protocol) just to get more uniform and faster
data. I think the cathode white dots may in part be steam bubbles.
The temperature of the electrolyte you can see in the display. We
are looking at near-room temperature. The white spots exceed, what
is it? 20 degrees elevated temperature? Steam would be *way* above
that. The cathode temperature, except for the spots, isn't anywhere
near boiling.
It is not necessary to have a general surface boiling to get
cavitation. It is only necessary that conductivity in a small spot
be momentarily greatly increased. One mechanism for this could be a
dendrite electrically heating, vaporizing, and forming a gas bubble,
greatly increasing its electron emissions throughout the process, and
breaking down the interface. A momentary high current density can
then expand a bubble, making steam, insulating the spot, and ending
the expansion. The cool electrolyte can then condense the steam
producing a bubble collapse, causing cavitation damage to the
surface, and generating particle producing nuclear reactions.
Electrospark produces cavitation just fine at 30 °C to 60 °C. It
looks and sounds just like the video. The difference between HV
anode effects and LV cathode effects would be mainly in energy
quantity. Cavitation is cavitation though. It makes sound.
Best regards,
Horace Heffner
http://www.mtaonline.net/~hheffner/
