32" build in Calgary, AB - pompeii neapolitan

[IH123]

I am planning to shape the inner arch (throat) bricks so that they facilitate the smoke move to the flue gallery without swirls, by curving the brick so any 90 degree edges becomes curved:




How it may work: Air hits top thin micro layer inside will swirl and push the air upcoming down which will exist without swirling (colliding) on the brick and as it exists from under the arch there will be even a more steep slop to help vacuum suck it up on a circle arc instead of it has to bloom before escaping , therefore least if not none of flame or smoke escaping to oven mouth .

[david s]

If you are concerned about a smooth flow of exhaust, laminar flow and turbulence, a smooth surface as well as appropriate form are the primary considerations, )ust as the form and the surface of a yacht hull are important factors in reducing drag. In this regard a smooth round stainless pipe is far better than a square chimney (round best square second rectangular last. The inner surface of the pipe presents far less drag than the rough lumpy surface of a brick chimney. Stainless pipe first, cast surface second, brick surface last. Of course soot build up alters the surface and introduces increased drag, but I’ve never heard of anyone cleaning their chimney in order to improve the draw performance, it’s usually done to reduce them catching on fire.
The flue gallery however, is an area that can greatly benefit from a decent form and attention to inner surface, just as well designed headers that replace the standard manifold in car engines improves breathing and therefore performance. The form of an inverted funnel allows for better smoke collection and a smooth flow to a smaller cross sectional pipe or chimney. If the flue gallery is made from sheet stainless, it is quite light which reduces the heat sink effect of a brick gallery. A cast form, whilst heavier than a stainless one, but if thin is still considerably lighter than a brick one can easily form compound curves not possible for brick units. So if it’s efficiency you’re after a stainless form is first, cast gallery second and brick gallery last.

[UtahBeehiver]

Can't remember if we talked about a tapered inner arch configuration. Takes a little more work up front but makes the tie-in of the dome to the inner arch more precise and easier.