[Stoves] Stoves Digest, Vol 108, Issue 12

[Crispin Pemberton-Pigott]

Dear Norm

Consider this:  If you have sharp corners, is there soot accumulating or not?  If not, there you might have soot in the exhaust. Maybe not. If you have soot accumulating, and you change the shape slightly so it stops accumulating, now you have soot that no longer collects on the corners, and leaves the stove to pollute the air.

Carbonaceous soot forms after combustion in almost all cases. The charged atoms or small molecules are highly reactive and stick together very easily. In the heat the rapidly come into contact and the particles grow quickly. If you measure them just above the fire the total mass will be spread over a large number of particles. If you measure 1 metre above, the same mass can be found, but with a much smaller number of larger particles.  If you measure 1 km downwind, there will be a few very large particles, some of which may have already fallen to the ground.

Look for “giant dentritic particles” and see some micrographs.  They look like a marble collection.  Wet particles composed of condensed tars and volatiles (which your TLUD probably has lots of) stick together wonderfully.  Imagine aerosolized fly paper, a spray of duct tape glue that never reached a surface: sticky stuff floating in the air.

So it if doesn’t accumulate on a surface, it means no cleaning needed, but not that it is absent.  That’s a separate measurement.

I hope your testing goes well.

Regards
Crispin

+++++++


Crispin;

Thank you so much for the explanation. Very interesting. In my latest TLUD design, I have a lot of sharp corners. Later on I plan to test emissions at Aprovecho. Perhaps I could test for this as well.

Thanks again. Most appreciated.

Norm

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Today's Topics:

   1. TLUD Design and operation (Norman Baker)
   2. Re: TLUD Design and operation (Crispin Pemberton-Pigott)


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