[Stoves] Cyclonic sorting/cooling

[drew]

Interestingly the cyclonic effect could be adding to the efficency of 
the device, not by mixing but by sorting,  the centripidal force 
throwing heavier/cooler gasses to the outside, while the hot light 
gasses move inward.    See

http://en.wikipedia.org/wiki/Vortex_tube

Though your gas speeds are low, even the sorting of the heavy and cooler 
particulates along the walls may help explain the cooler than expected 
vessels

Take Care
Drew

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