[Stoves] Superficial Velocities experiment in WoodGas Stoves

[frank]

Jeff,
I think mixing gases is not at all off topic. The experiment I set up it 
should have taken > 2 min. to reach the detector - it took about 18 
seconds!. Serious non mixing.

For soil we use a splitter. You dump in the soil at the top and it falls 
through a series of channels directing it in several directions. Run the 
sample through a few time and you have it mixed. I think the plastic 
balls with a Coefficient of Variance of one work much the same. Air hits 
one ball and is redirected to four directions. Hits another ball and 
redirected in four other directions mixing in each direction with gas 
from another place. Not sure how many layers are needed for complete 
mixing.

We would make glass balls from glass tubing for refluxing hot acid in 
test tubes. Test tube would stick up above the heating block, the ball 
would cause the fuming acid to condense and drip back into the tube. 
Reason I mention this is because the glass balls had a vacuum inside. 
Drop on the floor and it makes a loud pop. I think a thin walled glass 
ball with a vacuum inside would not remove much heat from the air. Also 
I think it could handle the heat from the gases between the primary and 
secondary burn in a TLUD. (< 400 deg C?).  Too delicate for commercial 
but good for research to see if this mixing would make a difference.


Frank





Jeff Davis wrote:

>On Sunday 05 August 2007 1:49 pm, frank wrote:
>  
>
>>It seems air flowing through a pipe does very little mixing.
>>    
>>
>
>And that's one of the problems with tube gas coolers. To help mix the gas in 
>my cooler I use sharp elbows not nice rounded ones.
>
>
>Kind of off subject,
>
>
>Jeff
>
>_______________________________________________
>Stoves mailing list
>Stoves at listserv.repp.org
>http://listserv.repp.org/mailman/listinfo/stoves_listserv.repp.org
>http://stoves.bioenergylists.org
>http://info.bioenergylists.org
>
>
>
>  
>

-- 
Frank Shields
Soil Control Lab
42 Hangar way
Watsonville, CA  95076
(831) 724-5422 tel
(831) 724-3188 fax
frank at compostlab.com
www.compostlab.com