No laws of physics being broken as far as I can tell.Brooks speculated that what is going on is that the highly pressurized air streams are banging particles together and against the sides of the Windhexe in a speeded-up version of the way lapidaries polish gems in a tumbler.
Other scientists said that as the air is forced down the funnel at the bottom, the pressure and speed have to increase proportionally, the same way a stream of water builds up pressure and shoots out farther from a hose when you put your thumb in the way.
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“It may just be a very efficient way to knock things into walls very fast,” Brooks concluded. “Fast, but in a gentle way — not like a cannon into a wall.”
I think a better question would be: if you can dump your waste and get energy out of the process, why would you do anything else? I could see it being the first stage of a longer process, but on its own I'd be LOOKING for a way to get energy back to run the process in the first place.Why would you do that? Its intended purpose isn't in energy production.
The question is how does it stack up against other methods of grinding/chopping things to powder, as far as energy use goes? Longevity could be in its favor--no blades to go dull.
The internal abrasion is a good point. When grinding anything harder than biological materials, the inside should probably be coated in a really hard alloy, or that recently developed shatterproof ceramic.