I have not built something like this myself, but I suspect on a first
pass I would do what you did. Since that did not work I would start
thinking about it like a resistive series/parallel circuit and figure
out what kinds of resistances I would need to get an equal current
appearing out of the parallel branches.
After that I would try adjusting the sizes of the holes or channels
based on what kind of ratios I get from the resistor analogy.
I think I would keep the hole sizes the same, but vary the channel
widths to avoid any issues with capillary effects when going between
liquid and air.
--- In
Homebrew_PCBs@yahoogroups.com, "lcdpublishing"
<lcdpublishing@...> wrote:
>
> Hi Guys,
>
> I am working on a new etching tank for Ferric Chloride. I was using
> two bubble stones for aquariums, one clogged pretty quickly and the
> second one didn't last all that long.
>
> So, I figured I would take a sheet of PCB board and drill a bunch of
> holes in it as a baffle. The I would run an air hose through it and I
> would have lot's of tiny bubbles coming up. Nope, I got big bubbles
> out of a couple of the holes. I started out with .020" diameter
> holes, then tried .035, then .045" and finally .055" holes. Not
> working good at all.
>
> So, I am stumped now and am wondering what you guys are using to get
> better distribution of your air bubbles.
>
> Chris
>