<div dir="ltr"><div><div><div><div>Prof. Paul Anderson and all,<br><br></div>In Prime/UB stoves, the smoke is burnt partially using residual pre-heated primary air. That mechanism could crack large molecules, such that when the they are burnt the flame becomes much transparent that if they are directly burnt without initial combustion.<br></div>The direction of secondary air is made cross and against the direction of smoke by geometrical shape of the burning chamber. <br><br></div>Kind regards<br></div>M. Nurhuda<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Sat, Oct 8, 2016 at 6:45 PM, Paul Anderson <span dir="ltr"><<a href="mailto:psanders@ilstu.edu" target="_blank">psanders@ilstu.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
Dear Prof. Nurhuda,<br>
<br>
Please clarify about what happens in the Prime/UB stoves. A diagram
showing air flows would be useful. <br>
<br>
I suspect that the "direction of the secondary air against the
smoke" would be increasing turbulence (mixing) and not PRE-mixing of
air (with O2) and combustible gases in some way that is separate in
(very short) time and space from what Alex is doing.<br>
<br>
Regardless of premixing or not, readers of this Stoves Listserv
would be interested in any updates about the activities of Prime/UB
stoves, which I believe is having strong sales in Indonesia (and
beyond?). Your good work deserves to be known and acknowledged.<br>
<br>
Paul<br>
<pre class="m_-7289437261996627730moz-signature" cols="72">Doc / Dr TLUD / Prof. Paul S. Anderson, PhD
Email: <a class="m_-7289437261996627730moz-txt-link-abbreviated" href="mailto:psanders@ilstu.edu" target="_blank">psanders@ilstu.edu</a>
Skype: paultlud Phone: <a href="tel:%2B1-309-452-7072" value="+13094527072" target="_blank">+1-309-452-7072</a>
Website: <a class="m_-7289437261996627730moz-txt-link-abbreviated" href="http://www.drtlud.com" target="_blank">www.drtlud.com</a></pre>
<div class="m_-7289437261996627730moz-cite-prefix">On 10/7/2016 11:14 PM, Muhammad Nurhuda
wrote:<br>
</div>
<blockquote type="cite">
<p dir="ltr">Dear all,</p>
<p dir="ltr">The Prime/UB stoves utilizes the pre-mixing
mechanisms by altering the direction of secondary air against
the smoke, in addition to the pre-heating of both primary and
secondary air.</p>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Oct 8, 2016 11:11 AM, "Paul
Anderson" <<a href="mailto:psanders@ilstu.edu" target="_blank">psanders@ilstu.edu</a>>
wrote:<br type="attribution">
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000"> Alex and all,<br>
<br>
This work on pre-mixing is, in my opinion, extremely
important. Many should participate.<br>
<br>
Paul<br>
<pre class="m_-7289437261996627730m_-832629968105847094moz-signature" cols="72">Doc / Dr TLUD / Prof. Paul S. Anderson, PhD
Email: <a class="m_-7289437261996627730m_-832629968105847094moz-txt-link-abbreviated" href="mailto:psanders@ilstu.edu" target="_blank">psanders@ilstu.edu</a>
Skype: paultlud Phone: <a href="tel:%2B1-309-452-7072" value="+13094527072" target="_blank">+1-309-452-7072</a>
Website: <a class="m_-7289437261996627730m_-832629968105847094moz-txt-link-abbreviated" href="http://www.drtlud.com" target="_blank">www.drtlud.com</a></pre>
<div class="m_-7289437261996627730m_-832629968105847094moz-cite-prefix">On
10/7/2016 6:15 AM, alex english wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">
<div>Paul,</div>
<div>You asked what I might be able to do to shed
light on the conditions for achieving a blue flame.</div>
<div><br>
</div>
<div>This week I followed the evidence. It was clear
from running a TLUD at higher temperatures that the
flame behaved differently than my original example.
The flame speed of the mix could attach at the point
of secondary air entrance in a 2 inch pipe ( all
measures are inside diameter). Reducing this to 1.5
inches moved the flame up to the transition back to
2 inches. The flame speed was two slow for the
higher speed in the 1.5 inch pipe. However the 1.5
inch section was six inches long and it was clear
that the flame was not very well premixed because of
tall orangey tails extending from the lower blueish
portion. So a few increments of changes later the
burner now has 18 inch mixing tube between the
secondary air introduction and the point of flame
attachment. It steps down from 2 to1.5 to 1.25 and
up again to 1.5 to 2 to 2.5 which is the cone that
expands to 6 inches.</div>
<div><br>
</div>
<div>This is the result;</div>
<div><a href="https://www.youtube.com/watch?v=5sjOTHwDsWo" target="_blank">https://www.youtube.com/watch?<wbr>v=5sjOTHwDsWo</a><br>
</div>
<div><br>
</div>
<div><i>It is quite different than the origional slow
continuous blueming flame flower </i></div>
<div><i>Here again</i></div>
<div><i><a href="https://www.youtube.com/watch?v=jnV1e60NTss" target="_blank">https://www.youtube.com/watch?<wbr>v=jnV1e60NTss</a><br>
</i></div>
<div><i><br>
</i></div>
<div><i>There are a differences that are due to the
fuel gasses, the temperature of the gasses and
perhaps the excess air values. All play a role. </i></div>
<div><i>The much longer mixing tube changes the net
draft as well. Also I was unable to light the mix
from the secondary air entrance. Had to be lit
top- down.</i></div>
<div><br>
</div>
<div>Here is a fun ignition shot. Talk about
descending flame fronts:)</div>
<a href="https://www.youtube.com/watch?v=X7JepJ1MdWg" target="_blank">https://www.youtube.com/watch?<wbr>v=X7JepJ1MdWg</a><br>
<div><br>
</div>
<div>You tube has a 'gear' icon in the lower right of
the screen where you can control the speed of the
video replay (without sound). It is informative to
watch these at .25 speed. The glowing meteor sparks
show up better. Starting and stopping the videos
freeze them in there tracks. If one knew the frame
speed of the camera you could almost calculate the
velocity of the sparks by the length of their paths.</div>
<div><br>
</div>
<div>Sorry to interrupt the very interesting
discussion of charcoal.</div>
<div>Alex</div>
</div>
<br>
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