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Alex and all,<br>
<br>
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. <br>
<br>
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. <br>
<br>
Until then, that little bit of doubt still lingers. Something
scientific has not yet been fully tested. This IS the frontier of
cookstove technology.<br>
<br>
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.<br>
<br>
Paul<br>
<br>
<pre class="moz-signature" cols="72">Doc / Dr TLUD / Prof. Paul S. Anderson, PhD
Email: <a class="moz-txt-link-abbreviated" href="mailto:psanders@ilstu.edu">psanders@ilstu.edu</a>
Skype: paultlud Phone: +1-309-452-7072
Website: <a class="moz-txt-link-abbreviated" href="http://www.drtlud.com">www.drtlud.com</a></pre>
<div class="moz-cite-prefix">On 3/24/2018 12:11 PM, alex english
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CA+6hwOpp7vk3sDP6GAVPDi2=oE2B4_B=3NxJpVwqDTLh93fWBw@mail.gmail.com">
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<div>Paul,</div>
<div>Lacking anything like data backed proof of down-drafting
in these little stoves without fans. I say no way.</div>
<div><br>
</div>
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.
<div><br>
</div>
<div>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. </div>
<div><br>
</div>
<div>There's no pressure gradient to drive this fantasy in the
real world.</div>
<div><br>
</div>
<div>Ah there's Hugh now....driving his own spike.</div>
<div><br>
</div>
<div>Done</div>
<div><br>
</div>
<div>Alex</div>
</div>
<br>
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