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 <[email protected]>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 <[email protected]> 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 >> [email protected].**org <[email protected]> >> >> 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 > > > _______________________________________________ > Stoves mailing list > > to Send a Message to the list, use the email address > [email protected] > > to UNSUBSCRIBE or Change your List Settings use the web page > > 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/ > > > -- 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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