[Stoves] the 150 gasifier in operation in Vietnam

Boston Nyer boston at burndesignlab.org
Sun Mar 4 12:46:34 CST 2012


Hi Paul,

Thanks for sharing your wire-mesh radiator concept with the group.  Very
interesting indeed.

Question: what type of steel mesh are you using?

General thought: the radiator will most likely be far more effective in a
~convection only gasifier, such as your rice-husk TLUD as compared to a
stove that has more inherent radiation (charcoal or simmer phase of wood
rocket).  In those cases, the HX is more dynamic because the wire mesh will
decrease the view factor of the radiation from the coals.

Thanks!
Boston


On Sun, Mar 4, 2012 at 8:23 AM, Alex English <english at kingston.net> wrote:

> Hi Crispin and Paul,
> Bluff bodies (BB) are refered to in fluid dynamics generally   for which
> combustion of gases is a subset. The definition of a BB
> "a solid obstruction in a fluid stream, having a broad flattened front and
> providing a shelter for small scale turbulence and zones of low velocity; a
> stability assister."
> (from the  North American Combustion Handbook (Vol 2))
>
> So does a screen qualifies as a bluff body? It can be a flame holder as
> can a single wire in the path. We have  a screen burner on our  propane
> refrigerator but the flame is down sream of the screen. I don't think the
> screen glowed.
>
> Paul's burner appears to have good flame holding at the holes in the
> burner head. He mentions  the screen protects these flames from the wind
> and that combustion is below the screen.  So in this case it is not clear
> that there is any combustion happening in or on the outer surface of the
> screen although it could be invisible to our eyes.  So you could say that
> there are two screens, the holes in the burner head being the first screen,
> the BB perhaps, and the second is simply a radiator/wind screen. The small
> pressure drop across the screen also helps distribute the flow evenly.
>
> All in all,  great result= great design.
>
> Alex
>
>
>
>
> On 04/03/2012 8:26 AM, Crispin Pemberton-Pigott wrote:
>
>> Paul, what you are describing are the effects of a 'bluff body'. It is
>> why they are sometimes used above a flame.
>> Crispin
>>
>>
>
> ______________________________**_________________
> Stoves mailing list
>
> to Send a Message to the list, use the email address
> stoves at lists.bioenergylists.**org <stoves at lists.bioenergylists.org>
>
> to UNSUBSCRIBE or Change your List Settings use the web page
> http://lists.bioenergylists.**org/mailman/listinfo/stoves_**
> lists.bioenergylists.org<http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org>
>
> for more Biomass Cooking Stoves,  News and Information see our web site:
> http://www.bioenergylists.org/
>
>


-- 
Boston Nyer
Director of Operations
BURN Design Lab
www.burndesignlab.org
Skype: BostonNyer
Cell: 585.503.3459
Office: 331.444.BURN
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.bioenergylists.org/pipermail/stoves_lists.bioenergylists.org/attachments/20120304/2184746b/attachment.html>


More information about the Stoves mailing list