[Stoves] the 150 gasifier in operation in Vietnam

[Paul Olivier]

Boston,

Up to this point, I merely used a strainer with a double wire mesh.
The first wire mesh is very coarse and provides strength.
The second wire mesh is much finer.
Surely both wire meshes are of stainless steel.
But I do not know the grade.

I would like to find a 60 mesh wire mesh of 446 stainless steel.
But so far I have not found it.

Does anyone know if silicon carbide cloth would work in this situation.
I read that silicon carbide cloth is used as an emitter in
photothermovoltaics.

I know that a tungsten wire mesh exists.
But no doubt this would be too expensive.

What is the best material to use in this application?

Paul


On Mon, Mar 5, 2012 at 1:46 AM, Boston Nyer <boston at burndesignlab.org>wrote:

> 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
>>>
>>>
>>
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>
>
> --
> Boston Nyer
> Director of Operations
> BURN Design Lab
> www.burndesignlab.org
> Skype: BostonNyer
> Cell: 585.503.3459
> Office: 331.444.BURN
>
>
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-- 
Paul A. Olivier PhD
27C Pham Hong Thai Street
Dalat
Vietnam

Louisiana telephone: 1-337-447-4124 (rings Vietnam)
Mobile: 090-694-1573 (in Vietnam)
Skype address: Xpolivier
http://www.esrla.com/
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