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<DIV><FONT size=4>Another problem with a concentrator ring is that it blocks the
radiant heat.</FONT></DIV>
<DIV><FONT size=4>If you are using a fan you should have enough velocity to mix
inside the burner. </FONT></DIV>
<DIV><FONT size=4>Having enough velocity without a fan is more of a challenge. I
use a low friction airflow path and draft and I am able to get mixing below the
pot.</FONT></DIV>
<DIV><FONT size=4>Instead of using a concentrator ring in my SLC I do the
opposite. The burner increases in diameter at the top to give the pot a larger
"radiant view" of the fire.</FONT></DIV>
<DIV><FONT size=4>If the air enters the burner in a near tangential way you
will get a fire tornado and a tall flame and that is also a
problem.</FONT></DIV>
<DIV><FONT size=4>I am testing a stove today using different types of
wood.</FONT></DIV>
<DIV><FONT size=4>Lanny</FONT></DIV>
<DIV><FONT size=4></FONT> </DIV>
<BLOCKQUOTE
style="BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=crispinpigott@gmail.com href="mailto:crispinpigott@gmail.com">Crispin
Pemberton-Pigott</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=stoves@lists.bioenergylists.org
href="mailto:stoves@lists.bioenergylists.org">'Discussion of biomass cooking
stoves'</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Saturday, October 05, 2013 8:56
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [Stoves] The
time-temperature-turbulence equation</DIV>
<DIV><BR></DIV>
<DIV class=WordSection1>
<P class=MsoPlainText>Dear Jock<o:p></o:p></P>
<P class=MsoPlainText><o:p> </o:p></P>
<P class=MsoPlainText>>When I read your "In the time-temperature-turbulence
equation" lights went off. <o:p></o:p></P>
<P class=MsoPlainText><o:p> </o:p></P>
<P class=MsoPlainText>I would rather hear they went on.<o:p></o:p></P>
<P class=MsoPlainText><o:p> </o:p></P>
<P class=MsoPlainText>You are quite correct in your analysis, though be
careful about generalising on the other approach.<o:p></o:p></P>
<P class=MsoPlainText><o:p> </o:p></P>
<P class=MsoPlainText>>I expect this is why my iCans with three washers as
deflectors, in contra distinction to a "concentrator ring", burn
cleaner.<o:p></o:p></P>
<P class=MsoPlainText><o:p> </o:p></P>
<P class=MsoPlainText>Correct, with the proviso that the concentrator ring
could be better it is broke the incoming (lateral) flow towards the centre
into jets. The point is to get turbulence while not shortening the residence
time 'at temperature'. The easiest way improve the concentrator ring is not to
have one in the first place, but to create the same effect using hot secondary
air jets. The result is you can drop fuel in without hindrance and there is
one less part to make.<o:p></o:p></P>
<P class=MsoPlainText><o:p> </o:p></P>
<P class=MsoPlainText>If the ring is a necessity, make it using a
concertina-forming tool so the gas flow is divided. Anything to make it
<I>not</I> be a smooth flow like water going down a round hole with a radiused
edge. <o:p></o:p></P>
<P class=MsoPlainText><o:p> </o:p></P>
<P class=MsoPlainText>This is particularly important when the excess air level
is low because it is hard for the H and C to find O2 when it is in short
supply without turbulence.<o:p></o:p></P>
<P class=MsoPlainText><o:p> </o:p></P>
<P class=MsoPlainText>>They are essentially soot free. Perhaps "soot
free" should be a goal?<o:p></o:p></P>
<P class=MsoPlainText><SPAN style="COLOR: black"><o:p> </o:p></SPAN></P>
<P class=MsoPlainText><SPAN style="COLOR: black">Correct again.
<o:p></o:p></SPAN></P>
<P class=MsoPlainText><SPAN style="COLOR: black"><o:p> </o:p></SPAN></P>
<P class=MsoPlainText><SPAN style="COLOR: black">Regards<o:p></o:p></SPAN></P>
<P class=MsoPlainText><SPAN style="COLOR: black">Crispin<o:p></o:p></SPAN></P>
<P class=MsoPlainText><SPAN
style="COLOR: black"><o:p> </o:p></SPAN></P></DIV>
<P>
<HR>
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