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Calculating current density
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jksav7 Offline
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Calculating current density
Here's another helpful explanation from Bob Boyce:

"When calculating surface area for current density, you measure how
much active surface area the current passes through ONCE. In a series
cell unit, each electrode of each cell will pass the same current
sequentially. So for the purpose of calculating current density, you
only add up the surface area of ONE electrode of ONE cell, and if
they are dissimilar sized (as in tubular cells) use the smallest
electrode.

Back to the Smacks booster... we can get a figure just using the
surface area of one side of 2 cover plates (about 24 Sq In), since
it's a series/perallel unit. Not accounting for the bypass currents,
maximum current would be limited to about 12 amps for the 1/2 amp per
square inch maximum. So we can see, the Smacks booster at 20 amps is
over the upper SS erosion limit. This means that the electrodes will
have a more limited lifespan. They might last for a couple of years
instead of decades. At 25 amps they might not even last for a year.

Hope this helps
Bob"


What isn't mentioned here is that no more than .25-.5 amp should be pumped through every 1 sq. inch of surface area. Bob's explanation is more or less to figure out how to calculate the surface area of the electrodes in a booster.
06-20-2008 10:42 PM
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