<html><head><meta http-equiv="Content-Type" content="text/html charset=windows-1252"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><div>Paul, Julien, List</div><div><br></div><div><span class="Apple-tab-span" style="white-space:pre"> </span>Here is an idea that might be worth trying with what Julien already has available: </div><div><br></div><div><span class="Apple-tab-span" style="white-space:pre"> </span>The central “buffer cylinder ” could be dropped all the way down to rest directly on the fuel bed. The bottom end of the cylinder should be closed - not open as in Jock’s work. It should drop freely as pyrolysis causes the fuel bed to shrink. It could be centered with 3 loosely-fitting longish screws top and bottom. Not sure, but I think there is an advantage to having the “buffer” touch the charcoal</div><div><br></div><div><span class="Apple-tab-span" style="white-space:pre"> </span>There could be a way to get swirl using this “buffer cylinder”. Maybe a heavy duty spring could be used (both with and without bottom closure?)</div><div><br></div><div><span class="Apple-tab-span" style="white-space:pre"> </span>I have no idea what the right length of the buffer should be.</div><div><br></div><div><span class="Apple-tab-span" style="white-space:pre"> </span>The test could be run both with and without the washer-shaped concentrator below. The test can be run with all of the A,B, C geometries I think. </div><div><br></div><div><span class="Apple-tab-span" style="white-space:pre"> </span>I still have hopes for “A” (the “rectangular” - with no outer lower “washer” concentrator), but with the new “buffer cylinder” replacing the previous central lower blockage.</div><div><br></div><div>Ron<span class="Apple-tab-span" style="white-space:pre"> </span></div><div><br></div><div><br></div><br><div><div>On May 6, 2014, at 7:49 AM, Paul Anderson <<a href="mailto:psanders@ilstu.edu">psanders@ilstu.edu</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">
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<div class="moz-cite-prefix">Julien, [And of interest to all TLUD
stovers.]<br>
<br>
Very nice experiment. There are several variables to consider:<br>
<br>
1. Increase the diameter of the central buffer cylinder<br>
<br>
2. As the buffer cylinder gets wider, it will need to be raised
slightly from the concentrator hold.<br>
<br>
3. The buffer cylinder might be shorter (not up to the top of the
riser, ie., the internal chimney that is below the pot). That
would allow the Venturi Effect to cause swirling back into the
center of the riser.<br>
<br>
4. Variations in the holes for the entry of the secondary air,
such as smaller but more numerous, or with deflectors to cause the
air to enter at different angles. [ This is a bit more work
because it requires making other "burners"/risers. It is good
that the main material is a common-size tin can. ]<br>
<br>
5. There is also the issue of the ConcAbove that should not be
totally discarded without further experimentation. There is
evidence that having SOME (unknown amount) secondary air entering
the fuel chamber (that is, below the concentrator) helps maintain
the needed heat and the flame, giving additional buoyancy (push or
thrust) to get the combustible gases to exit upwards through the
concentrator.<br>
<br>
6. Other variations that others can suggest.<br>
<br>
At this early stage, it appears to me that the rectangular burner
is not as likely to have good results as is the ConcBelow
design. After a few more trials, it might be set aside. <br>
<br>
Also, I hope that several others Stovers will join in and
replicate and expand upon what Julien is doing. <br>
<br>
I have also already discussed with Julien if he could attend the
Stove Camp at Aprovecho on 21-25 July this year. And even if he
cannot, he and I will try to have the latest of the research about
TLUD burner designs available at the Camp for some demonstrations
and testing under the emissions hood.<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>
On 5/5/2014 9:27 PM, Julien Winter wrote:<br>
</div>
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<div>Hi Stovers;</div>
<div><br>
</div>
<div>At the suggestion of Paul Anderson, I ran single tests on
the burner with the concentrator below secondary air holes
(ConcBelow), and the discontinuous annular (Rectangular)
burner. In these tests I put a 2.5 cm diameter cylinder in
the center of the burners to direct flamelets upwards in the
chimney.</div>
<div><br>
</div>
<div>A pdf is attached. Photographic conditions were not ideal
(nor was my old camera), but good enough to see how the
flamelets were affected.</div>
<div><br>
</div>
<div>I can't say if the central cylinder was an improvement,
because my soot test was not that sensitive. However, the
central cylinder didn't appear to increase soot production
compared to having no cylinder, nor did it slow down the rate
of gasification.</div>
<div><br>
</div>
<div>Future, more detailed experimentation could include a
central cylinder to see if it reduces the mass of soot
produces, and increases the rate of heat transfer to the pot.</div>
<div><br>
</div>
<div>Cheers,</div>
<div>Julien.<br clear="all">
<br>
-- <br>
</div>
<div dir="ltr">Julien Winter<br>
Cobourg, ON, CANADA<br>
</div>
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