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Dear Kirk,<br>
<br>
Please be reassured that innovative work by you, Julien Winter, and
others is GREATLY appreciated by all of us. <br>
<br>
I have taken the liberty of posting your message (below) to the
entire Stoves Listserv. I hope that you and others will all do
that in the future, to reach a far wider audience. The Stoves
Listserv has been an EXTREMELY POWERFUL AND APPROPRIATE avenue for
communications. Without it, TLUD stove technology would probably
still be almost unknown. <br>
<br>
I hope that more people will participate with the Venturi gas mixing
initiatives. Please post to the Stoves Listserv.<br>
<br>
Paul<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 9/1/2015 12:34 PM, kgharris wrote:<br>
</div>
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<div><font size="2" face="Arial">All,</font></div>
<div> </div>
<div><font size="2" face="Arial">My thoughts are that for over
a century fossil gas fuels have had the advantage over
wood stoves in that they could be premixed with air with a
very efficient device called a Venturi gas mixer. A
Venturi mixer lowers the pressure of one of the gasses by
accelerating it. The higher pressure gas is brought into
contact with the lower pressure gas, and rushes into it to
equalize the pressure. The gasses are thoroughly mixed and
are then ignited at a burner. </font></div>
<div> </div>
<div><font size="2" face="Arial">Then Paal Wendelbo, Dr. Tom
Reed, Dr. Ron Larson, Dr. Paul Anderson (Dr. TLUD), and
other gifted experimenters developed the micro-gassifier
stove. With this development it is possible to give wood
stoves the same mixing advantage that fossil gasses have
enjoyed all these years. A TLUD Venturi gas mixer would </font><font
size="2" face="Arial">look much different than a fossil
fuel Venturi mixer because fossil fuels start off cool and
pressurized. This is not the case with the wood gas in a
TLUD, which is hot and near atmospheric pressure. The
device would have to change the pressure of one of the
gasses, either the air or the wood gas so that the other
gas will rush into it to equalize the pressure. One way
this is possible is by accelerating the raising wood gas
around an object such as a tube. As the wood gas moves
around the tube it's velocity increases, and it's pressure
decreases, according to the Venturi effect. Then the two
gasses must be brought into contact with one another so
they can mix. Openings in the sides of the tube at the
point of maximum velocity of the wood gas, and thus it's
lowest pressure, will allow air from inside the tube to
mix with the wood gas. The air will rush out of the tube
and into the wood gas to equalize the pressure, and the
two gasses will mix. This operates in addition to the
natural draft, giving the mixing an extra boost. Natural
draft by itself does not create a pressure difference that
can cause this type of mixing. Gasses brought together by
natural draft have only a miniscule pressure difference
and will have no motivation to mix except diffusion, which
can be increased by turbulance. But diffusion mixing, even
with turbulance, must be awfully good to aproach Venturi
mixing.</font></div>
<div> </div>
<div><font size="2" face="Arial">One commonly used type of
fossil gas Venturi mixer allows pressureized gas to escape
through a small hole. A stream of gas is created and
accelerated to a very high velocity, and thus a very low
pressure. This allows a small mixer to do considerable
mixing. Accelerating the TLUD wood gas around a tube does
not create such a large pressure difference. The pressure
difference is less, so the design must include a lot of
mixing area. A mixing array having a number of mixing
tubes is necessary. This requires that the wood gas be
spread across the entire array, so as to use the entire
array and not overload or underload any part of it. This
is the problem we are working on now, and I am trying the
ideas you have given.</font></div>
<div> </div>
<div><font size="2" face="Arial">Another advantage of using
the array of tubes is that the wood gas is shaped into
sheets as it passes between the tubes. These sheets are
fed with air from the tubes from both sides. Thus the air
only has to penetrate half the sheet of wood gas. This
occurs all across the entire array, and makes the mixing
very fast, such that it can work in a verticle distance of
perhaps one half to one inch. The burning takes longer,
but the mixing is fast. It can be seen as a blue flame at
the tubes which turns yellow as it raises. Of course this
happens only when the whole system is balanced and
functioning properly.</font></div>
<div> </div>
<div><font size="2" face="Arial">I have been working on the
shoulders of the above mentioned giants, and much of what
I have done is quite radical and so is not familiar to
them. I have had to break away from their thinking at
several points to follow these radical ideas. This does
not mean that I do not respect them, it just means that I
am adding my own little piece to the TLUD puzzle. </font></div>
<div> </div>
<div><font size="2" face="Arial">Kirk</font></div>
</font></div>
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<div style="FONT: 10pt arial">----- Original Message ----- </div>
<div style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color:
black"><b>From:</b> <a moz-do-not-send="true"
title="kgharris@sonic.net" href="mailto:kgharris@sonic.net">kgharris</a>
</div>
<div style="FONT: 10pt arial"><b>To:</b> <a
moz-do-not-send="true" title="electrum@spiritone.com"
href="mailto:electrum@spiritone.com">Steve Dixon</a> ; <a
moz-do-not-send="true" title="rldtcarvalho@gmail.com"
href="mailto:rldtcarvalho@gmail.com">Ricardo Luís Teles de
Carvalho</a> ; <a moz-do-not-send="true"
title="potaylor@bigpond.com"
href="mailto:potaylor@bigpond.com">Paul Taylor</a> ; <a
moz-do-not-send="true" title="ogilvia@gmail.com"
href="mailto:ogilvia@gmail.com">Jon and Flip Anderson</a> ;
<a moz-do-not-send="true" title="winter.julien@gmail.com"
href="mailto:winter.julien@gmail.com">Julien Winter</a> ; <a
moz-do-not-send="true" title="community@groundwork.org"
href="mailto:community@groundwork.org">Huck Rorick</a> ; <a
moz-do-not-send="true" title="art.donnelly@seachar.org"
href="mailto:art.donnelly@seachar.org">Art Donnelly</a> ; <a
moz-do-not-send="true" title="christa-roth@foodandfuel.info"
href="mailto:christa-roth@foodandfuel.info">CHRISTA ROTH</a>
; <a moz-do-not-send="true"
title="cody.anderson@scottsdalecc.edu"
href="mailto:cody.anderson@scottsdalecc.edu">Cody Anderson</a>
; <a moz-do-not-send="true" title="t.s.saloop@gmail.com"
href="mailto:t.s.saloop@gmail.com">Saloop T S</a> ; <a
moz-do-not-send="true" title="sbentson@aprovecho.org"
href="mailto:sbentson@aprovecho.org">Sam Bentson</a> ; <a
moz-do-not-send="true" title="psanders@ilstu.edu"
href="mailto:psanders@ilstu.edu">Paul Anderson</a> ; <a
moz-do-not-send="true" title="rongretlarson@comcast.net"
href="mailto:rongretlarson@comcast.net">Ronal W. Larson</a>
; <a moz-do-not-send="true" title="deankstill@gmail.com"
href="mailto:deankstill@gmail.com">Dean Still</a> </div>
<div style="FONT: 10pt arial"><b>Sent:</b> Friday, August 28,
2015 1:13 PM</div>
<div style="FONT: 10pt arial"><b>Subject:</b> Mixing array
problem</div>
<div><br>
</div>
<div><font size="2" face="Arial">All,</font></div>
<div> </div>
<div><font size="2" face="Arial">Greetings and best wishes.</font></div>
<div> </div>
<div><font size="2" face="Arial">I have been working to try to
get higher power levels for the Wonderwerk Strata combustor
I have been working on with some success. A problem keeps
popping up, and I was hoping to get some feed back from
you. The problem is that the flame tends to the middle of
the mixing array (see attachment photos of the bottom side
of the test combustor). This leaves the center area
overloaded and the outer area unused, but the flame needs to
be spread evenly over the entire array. I am not certain
why this would be so pronounced. I have minimized the
secondary air comming in from the outer edge of the stove,
which might blow the gasses to the center, but the problem
persists. I have tried several other ideas one of which you
can see in the pictures, widening the center to of the tubes
to create more flow resistance in the center forcing the
flame outward, which worked some. Any ideas?</font></div>
<div> </div>
<div><font size="2" face="Arial">Kirk</font></div>
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