<html>
<head>
<meta content="text/html; charset=windows-1252"
http-equiv="Content-Type">
</head>
<body bgcolor="#FFFFFF" text="#000000">
Julien,<br>
<br>
I really like the potential of you counter-current entry of
secondary air (before the air enters into the chamber; not downward
inside the chamber).<br>
<br>
But the Adair variation has the secondary air entering laterally and
mixing in with the gases. But the downward side of the hourglass
requires that the air/gas mixture (which could be flaming) must move
downward that inch or two to go under the lower lip of the
hourglass. <br>
<br>
So it is not the same as your counter-current. The two approaches
could be combined, if desired.<br>
<br>
Does the hourglass work? Kevin's experiences indicate that it helps
reduce blackening of the pots. Work needs to be done.<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 1/11/2016 7:47 PM, Julien Winter
wrote:<br>
</div>
<blockquote
cite="mid:CALv4xTxLB07K3wt814VuNCYz8HrRLJmJ-AqCe=2HSSrApTDsXw@mail.gmail.com"
type="cite">
<div dir="ltr">
<div>Hello Paul;<br>
<br>
If I understand your description of Kevin Adair's burner,
lowering an hourglass restriction to the level of a
concentrator would directed secondary downward against the
upward flow of the woodgas. We would no longer have a cross
current burner. We would have a counter current burner. A
simple demonstration can be seen here: <a
moz-do-not-send="true" href="https://youtu.be/RnVaHpLZg8U"
target="_blank"><a class="moz-txt-link-freetext" href="https://youtu.be/RnVaHpLZg8U">https://youtu.be/RnVaHpLZg8U</a></a><br>
<br>
If we have a counter current burner, then there would be good
turbulent mixing of air and gas at the base of the gas flame.
That is where most of the work of the burner would be done. <br>
<br>
</div>
<div>Research in Australia showed that when the aperture of a
concentrator ring was reduced below 70% of the reactor area,
the gasification rate started to decrease. If an hourglass
constriction functioned the same way (and since we have a
counter current burner, the conditions are not the same) it
could add some stability to the performance of a counter
current burner. In an open riser, a counter current burner
can create a strong draft of primary air, and cause an
excessive gasification rates.<br>
<br>
</div>
<div>I have measured soot deposits on pots when a using a
concentrator ring that I did not see with more open burners.
However, a concentrator has sharp edges that can create
turbulence and flame stress that may not occur with a smoother
restriction, like an hourglass.<br>
<br>
</div>
<div>I will have more to say about counter current burners in a
few days.<br>
</div>
<div><br>
</div>
<div><br>
</div>
<div>Cheers,<br>
</div>
<div>Julien.<br>
</div>
<div><br>
<br>
</div>
<div>
<div><br>
-- <br>
<div>
<div dir="ltr">
<div>
<div dir="ltr">
<div>
<div dir="ltr">Julien Winter<br>
Cobourg, ON, CANADA<br>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
Stoves mailing list
to Send a Message to the list, use the email address
<a class="moz-txt-link-abbreviated" href="mailto:stoves@lists.bioenergylists.org">stoves@lists.bioenergylists.org</a>
to UNSUBSCRIBE or Change your List Settings use the web page
<a class="moz-txt-link-freetext" href="http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org">http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org</a>
for more Biomass Cooking Stoves, News and Information see our web site:
<a class="moz-txt-link-freetext" href="http://stoves.bioenergylists.org/">http://stoves.bioenergylists.org/</a>
</pre>
</blockquote>
<br>
</body>
</html>