Tiny gas bubbles dispense out of ring sparger to ensure efficient gassing. They are used for intensive gassing of microbiological cultures, that show a high amount of oxygen expenditure in a short time period. If used elsewhere, care should be taken that the culture medium does not tend to foam and that the intensive formation of bubbles does not have any negative effects on cell growth.
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Your design looks good. I have used similar criteria to design spargers introducing steam into water and air into a fluidized bed. I cannot give you any further help on spacing the holes to avoid coalescence of the bubbles.
If I have understood you well, you want to do the same thing that a distribution plate in a fluidized bed is trying to do.
I would suggest that you make the total area of your orifices much less than the area of the tube to be sure you get bubbles out of all the orifices. The best would be to make your ring open to the supply of air at both ends rather than only one. That way you can best assure that the pressure on the inside of the tube is nearly the same at all orifices. Since your ring is rather small, that might be less of a problem.
Good luck. Bob Sander
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