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The phononic bandgap phenomenon relies on a crystalline type structure to work its magic. What if, instead of tubes stood vertical, the crystal structure was created by laying tubes longitudinally with the flow of the gasses? It would be MUCH easier to construct. Just tack weld a stack of tubes together. The parameters would be the diameter and length of the tubes. It would possibly be cheap, relatively light, very compact, and offer nearly zilch for back pressure.
Dang-it, Lynn! Now, I've got to go do another whole set of experiments. 8*)
Lynn Hanover wrote:
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