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<div class="moz-cite-prefix">On 07/17/2012 09:58 AM, Steve Taylor
wrote:<br>
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<div class="gmail_quote">On 17 July 2012 14:36, David G. LeVine
<span dir="ltr"><<a moz-do-not-send="true"
href="mailto:dlevine@speakeasy.net" target="_blank">dlevine@speakeasy.net</a>></span>
wrote:<br>
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Is there a good reason that a TLUD can not be hexagonal or
octagonal? Hexagonal packs better, but either can be made
to fold almost flat (assuming normal hinging.) Having
multiple staggered hinges allows very close to flat with
only a small amount of non-flat overhang.<br>
<br>
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Aren't they round to ensure uniform gas flow conditions for
both primary AND secondary air ? <br>
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Yes, but there is round and there is round. No TLUD stove I have
seen is round within 0.0001". The approximation of round with a
series of straight line segments is common (take a good look at
CAD/CAE software like Autocad and Corel DRAW!) and a small enough
deviation from round does not affect the air flow significantly.<br>
<br>
Let's assume a hexagonal shape. Can airflow be close enough to
uniform so there is little loss? I would believe it can. If not,
where will the air flow be nonuniform enough to have a significant
effect? <br>
<br>
I would be willing to bet that a triangular TLUD stove could be
built and it would be within 20% of the efficiency of a similarly
designed round one.<br>
<br>
Dave 8{)<br>
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