I do not see how the twisted tape can create turbulence with the low velocities
in the stove. There is probably something else going on that is increasing the
efficiency. The TT may slow down the flow and reduce the excess air?
You may be able to send some smoke through the stove to see the flow path.
Also anything between the fire and the pot will block radiant heat.
Dear Paul
Before rushing to put in the TT's be aware that such devices in the actual
flame will impede combustion quite a bit, producing a lot of soot (clinging to
it).
If the carbon falls into the fire and burns, that might be OK. If, strictly
speaking, the purpose is turbulence, it could as well be created with secondary
air jets and the soot avoided. Everyone should try it to see the effects.
Because we do not know the gas composition from the stove, it is hard to know
what the overall effect of the TTs was on combustion efficiency. This is the
sort of effect that is hard to guess.
Regards
Crispin
Frank,
see below
Surprised to see twisted tape adding efficiency as I would think that would
just remove heat that was on its way to the pot.
They twisted tape (TT) is quite small and will be up to full temperature
quite quickly. After that, they to not remove any more heat. But the added
turbulence continues. And seems to have substantial impact.
The test of the TT could easily be done in the Rocket stoves that have been
tested so many times. Does 1 or more TT have impact there?
TT is one of several major designs for turbulence. Looks like an important
topic for more study (and does not require fancy expensive equipment.
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