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

[Andrew Heggie]

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