[Stoves] venturi system -ratios of air and gas? / ND-TLUD

[Julien Winter]

Dear Frans;

I am intrigued about how the coanda effect can be used in ND-TLUDs.  Do you
have any photos or diagrams?

We have very little experimental data collected on ND-TLUDs to say much
about air/gas rations, and more.  I expect that will change before too
long, because stove developers are generating a large body of testable
hypotheses, and the importance of ND-TLUDs as a means of sustainably making
biochar and charcoal is becoming increasingly clear.  The pressure to fund
research is building.

We need funding for ND-TLUD research at practical level as well in high-end
analytic laboratories.  Over the coming months, I will become more active
at lobbying for funding for practical stove developers.

On my view 'stove testing' -- hypothesis-driven controlled experiments --
should be done by stove developers in their respective countries for their
respective constituencies.  What is currently called 'stove testing,' such
as one or two "Water Boiling Tests 4.2.3" done at a recognized laboratory,
should be more properly called 'stove certification'.  The function of
stove certification is to corroborate stove testing; it doesn't test
hypothesis, so it is not is a builder of stove science.

Burners are the central challenge for ND-TLUDs.  They have to function over
wide range of gasification rates, and a wide range of wood gas
compositions.  The ratio of air/gas needs to be carefully measured in
experiments that vary:

1) burner design geometry (that effects buoyancy forces, mixing, flame
shape, flame temperature, etc)
2) gasification rates that affects gas composition (superficial velocity of
primary air affects the temperature of the flaming pyrolytic front from 500
to 1200° C)
3) different fuels also affect gas composition (fuel bed architecture, fuel
reactivity and chemical composition, etc.)
4) through in a replication or four.

That's a nice little factorial experiment for you.  This is all part of
practical stove development.  This is where the *real* stove testing should
be done.

We need funding for supplies, equipment, and mentoring for practical
cookstove science, and capacity-building for native stove developers around
the World.  At the moment, a lot of work is being financed from personal
family incomes.

Cheers,
Julien.

-- 
Julien Winter
Cobourg, ON, CANADA
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