[Stoves] Biomass stoves v. PV-induction cooking (re: Frank)

[Ronal W. Larson]

Andrew:  cc list and Norm

	As Norm and I talked, we came to the same conclusion.  But it is and was a remarkable video to see ANY downward flowing gases.  I’d like to know if anyone with computational fluid dynamic simulation capability can report on this being observed as well - and whether they can report any negative implications, etc.
	
	Presumably this could suggest that larger is either better or worse.

	Thanks for the feedback.   Your own char-making was with very large diameters.  Might you have seen anything similar?

Ron


> On Feb 1, 2017, at 2:22 AM, Andrew Heggie <aj.heggie at gmail.com> wrote:
> 
> On 31 January 2017 at 17:04, Ronal W. Larson <rongretlarson at comcast.net> wrote:
> 
>> 2.   As an example of an unexpected unknown that I saw for the first time
>> yesterday:  Norm Baker is doing some extremely strong work on very large
>> TLUDs, and he gave an outstanding talk on his 16th model (called “Ring of
>> Fire”).  He later showed me parts of a 1.5 hour run with a pyrex window
>> inserted into the side of his barrel.  Neither of us know how to explain the
>> clear picture of pyrolysis gases (smoke) traveling DOWN near this window
>> (mostly - not periodically).  Anyone else seen this?  (pretty hard without a
>> window). Clearly the overall gas flow is upward - as he produces plenty
>> (35%) of high quality char.
> 
> Is this not a simple convection effect, the  outside of the  barrel
> being cooled by ambient air whilst the core is at ~600C?
> 
> I would expect this effect to be more pronounced the  larger the diameter.
> 
> I doubt it affects the burn much unless it causes a "fold" in the burning layer.
> 
> Andrew
> 
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