[Stoves] Premixing

[Paul Anderson]

Dear Prof. Nurhuda,

Please clarify about what happens in the Prime/UB stoves.  A diagram 
showing air flows would be useful.

I suspect that the "direction of the secondary air against the smoke" 
would be increasing turbulence (mixing) and not PRE-mixing of air (with 
O2) and combustible gases in some way that is separate in (very short)  
time and space from what Alex is doing.

Regardless of premixing or not, readers of this Stoves Listserv would be 
interested in any updates about the activities of Prime/UB stoves, which 
I believe is having strong sales in Indonesia (and beyond?).  Your good 
work deserves to be known and acknowledged.

Paul

Doc  /  Dr TLUD  /  Prof. Paul S. Anderson, PhD
Email:  psanders at ilstu.edu
Skype:   paultlud    Phone: +1-309-452-7072
Website:  www.drtlud.com

On 10/7/2016 11:14 PM, Muhammad Nurhuda wrote:
>
> Dear all,
>
> The Prime/UB stoves utilizes the pre-mixing mechanisms by altering the 
> direction of secondary air against the smoke, in addition to the 
> pre-heating of both primary and secondary air.
>
>
> On Oct 8, 2016 11:11 AM, "Paul Anderson" <psanders at ilstu.edu 
> <mailto:psanders at ilstu.edu>> wrote:
>
>     Alex and all,
>
>     This work on pre-mixing is, in my opinion, extremely important. 
>     Many should participate.
>
>     Paul
>
>     Doc  /  Dr TLUD  /  Prof. Paul S. Anderson, PhD
>     Email:psanders at ilstu.edu <mailto:psanders at ilstu.edu>
>     Skype:   paultlud    Phone:+1-309-452-7072 <tel:%2B1-309-452-7072>
>     Website:www.drtlud.com <http://www.drtlud.com>
>
>     On 10/7/2016 6:15 AM, alex english wrote:
>>     Paul,
>>     You asked what I might be able to do to shed light on the
>>     conditions for achieving a blue flame.
>>
>>     This week I followed the evidence. It was clear from running a
>>     TLUD at higher temperatures that the flame behaved differently
>>     than my original example. The flame speed of the mix could attach
>>     at the point of secondary air entrance in a 2 inch pipe ( all
>>     measures are inside diameter). Reducing this to 1.5 inches moved
>>     the flame up to the transition back to 2 inches. The flame speed
>>     was two slow for the higher speed in the 1.5 inch pipe. However
>>     the 1.5 inch section was six inches long and it was clear that
>>     the flame was not very well premixed because of tall orangey
>>     tails extending from the lower blueish portion.  So a few
>>     increments of changes later  the burner now has 18 inch mixing
>>     tube between the secondary air introduction and the point of
>>     flame attachment. It steps down from 2 to1.5 to 1.25 and up again
>>     to 1.5 to 2 to 2.5 which is the cone that expands to 6 inches.
>>
>>     This is the result;
>>     https://www.youtube.com/watch?v=5sjOTHwDsWo
>>     <https://www.youtube.com/watch?v=5sjOTHwDsWo>
>>
>>     /It is quite different than the origional  slow continuous
>>     blueming flame flower /
>>     /Here again/
>>     /https://www.youtube.com/watch?v=jnV1e60NTss
>>     <https://www.youtube.com/watch?v=jnV1e60NTss>
>>     /
>>     /
>>     /
>>     /There are a differences that are due to the fuel gasses, the
>>     temperature of the gasses and perhaps the excess air values. All
>>     play a role. /
>>     /The much longer mixing tube changes the net draft as well. Also
>>     I was unable to light the mix from the secondary air entrance.
>>     Had to be lit top- down./
>>
>>     Here is a fun ignition shot. Talk about descending flame fronts:)
>>     https://www.youtube.com/watch?v=X7JepJ1MdWg
>>     <https://www.youtube.com/watch?v=X7JepJ1MdWg>
>>
>>     You tube has a 'gear' icon in the lower right of the screen where
>>     you can control the speed of the video replay (without sound). It
>>     is informative to watch these at .25 speed. The glowing meteor
>>     sparks show up better. Starting and stopping the videos freeze
>>     them in there tracks. If one knew the frame speed of the camera
>>     you could almost calculate the velocity of the sparks by the
>>     length of their paths.
>>
>>     Sorry to interrupt the very interesting discussion of charcoal.
>>     Alex
>>
>>
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