[Stoves] Down with Fantasy-draft stoves

[Paul Anderson]

Alex and all,

Thank you all for your comments.   There was some discussion about this 
"downdraft in updraft" a few years ago, with a consensus of no downdraft 
occuring.   It is only because of the Heath Putnam videos that the topic 
has returned.

The discussion these last few days has been interesting.  Some comments 
/ hypotheses have been given.   Some suggestions of how additonal tests 
could be run have been made.   But nobody has replicated the Putnam 
experiments or tried some new test.   I hope that this will eventually 
be done, recorded on video, and posted for all of us to see.

Until then, that little bit of doubt still lingers.   Something 
scientific has not yet been fully tested.   This IS the frontier of 
cookstove technology.

This topic supports my contention that there is still much to learn 
about TLUD technology and micro-gasification in general.   TLUD stoves 
and micro-gasifiers will contnue to get better as the world eventually 
recognizes that they are burning gases (made inside the devices), not 
directly burning solid fuels.   And they are not like the old "stick 
burners" that keep hanging around and are promoted to impoverished 
people although stick burners and charcoal burners will never resolve 
the world's cookstove problems.

Paul

Doc  /  Dr TLUD  /  Prof. Paul S. Anderson, PhD
Email:  psanders at ilstu.edu
Skype:   paultlud    Phone: +1-309-452-7072
Website:  www.drtlud.com

On 3/24/2018 12:11 PM, alex english wrote:
> Paul,
> Lacking anything like data backed proof of down-drafting in these 
> little stoves without fans. I say no way.
>
> Buoyancy in chimneys and stoves is often visualized as something like 
> gasses, being sucked up. It is really gasses being pushed up by 
> heavier gasses being sucked down by by gravity more like water seeking 
> it own level and forcing air above it. Inside a top lit stove of 
> pellets the air in the bottom is cold and heavy. It is pushed up to 
> replace the lighter hot gasses above. Edge of container  effects may 
> cause small eddies. If it is cooler than the hot middle then a bit of 
> down movement but not much. As the container heats up it may be hotter 
> than the cool pellets in the middle. Then there would be a little 
> movement up near the edge. The end result in a TLUD is a fire or front 
> (MPF) that in fact seeks its own level.
>
> I have operated  Paul brand TLUD in a painted cylinder filled with 
> pellets so slowly that the pellets at the edge were torrified and the 
> rest were charred and the paint was still good.  I have operated 
> pellets at 18 inches in diameter , 40 inches deep for up to a 
> continuous burn of 12 hours. I have also operated continuous down 
> drafters for days but needed a hot 10 feet of chimney to over come 
> buoyancy in a two inch diameter burner.
>
> There's no pressure gradient to drive this fantasy in the real world.
>
> Ah there's Hugh now....driving his own spike.
>
> Done
>
> Alex
>
>
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