[Stoves] Smoke and air velosity measurement

[Paul S. Anderson]

Hugh,

I like the method of flying embers.  Even if it is done in an 
"unsophisticated"
way by simple observation, an observant human could probably detect 5 
different
speeds.

Is there some "substance" that could be placed into the fire to make 
the visible
"tracers"?

Frank, what do you think of this?

Paul
-- 
Paul S. Anderson, Ph.D., Geography professor - Emeritus
Telephone:  USA-309-452-7072 (residence and office)
Internet site:  www.ilstu.edu/~psanders
For my gasifier stoves info, go to:
http://bioenergylists.org/contributors#Paul_Anderson


Quoting Burnham-Slipper Hugh <eaxhb at nottingham.ac.uk>:

>
> Have you considered a very low-tech PIV: jiggle the sticks in the 
> fire and take a photograph of the embers that fly up. If you know the 
> shutter speed (by setting speed priority on the camera - 1/50th is 
> reasonable) and the distance travelled (by including a metal ruler in 
> the frame), then you can estimate the speed. You can also get a good 
> idea of the direction of the air flow. In order to be statistically 
> valid you may need in excess of 100 traces from independent flow 
> structures. You may wish to calibrate the shutter speed of the camera 
> by taking a shot of a rotating body whose speed you know from a 
> tacho. It can be rather time consuming, but the advent of digital 
> photography makes it a simple and cheap technique. I have used it on 
> a home-make rocket stove, estimating the velocity of gases leaving a 
> 0.3m high combustion chamber to be 1.0 +- 0.15 m/s.
> Hugh.


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