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.”
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.