Hi jr & Bruce,
I've been thinking some more about this project, and there's a lot
of things to consider.
For example, the sides are conductive, so the anode wires closest to
the sides will tend to carry the most current. This means the middle
section will contribute less, and the effective current density will
be higher than planned.
But how much, I don't know. You can get an idea of where the current
density is highest by running the cell current up high and watching
for signs of oxide buildup. It tends to gather first at the hot
spots. But you need a high voltage to get enough current in a
reasonable time.
The other problem is you have to sit there and watch it - for hours
on end. Then, just when you are not looking, the darned thing starts
doing what you waited so long to see, and you miss it:)
One method to solve this might be to make the anode height
adjustable. Here's a picture of the container with the water level
marked by the squiggles, '~', and the anode by the straight bar,
'-'.
+ +
+~~~~~~~~+
+ +
+ +
+ +
+ ______ +
+ +
----------
You can see the anode is mounted asymmetrically - closer to the
bottom so the distance to the nearest conductor is about the same
over the entire anode structure.
However, this may create another problem. Many ions can diffuse up
and out of harm's way, but others might end up crammed into the
space between the anode and the bottom. This increases the
production of oxides. So it may be cut and try to figure out the
best configuration.
Stirring is another issue. Which way should the water circulate -
vertical or horizontal? Vertical current should disperse the ions in
the space above the anode. Maybe thermal heating might work better
in this application.
I love new experiments! There is so much to learn:)
Best Regards,
Mike Monett
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