Ralf
New Member
Posts: 42 
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Post by Ralf on Nov 23, 2016 6:12:57 GMT -8
Great, thanks very much for the well reasoned reply !
I´m pretty sure the Testo won´t ly.
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Post by coisinger on Dec 8, 2016 6:47:39 GMT -8
This entire thread has been so informative. Thank you so much.
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Post by coisinger on Dec 19, 2016 4:35:07 GMT -8
Maybe you should consider using the 'golf ball' principle. If you dimple the riser tube, you will be reducing the surface tension on tube itself, thus allowing greater flow around the tube. It's probably not practical, but hey lets explore options.
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Post by briank on Mar 23, 2017 20:27:51 GMT -8
matthewwalker, this thread and your videos and slideshow of this build have been awesome. I've managed to collect all the parts and I'm starting a build on an L shaped version of your stove, with a 4' bell with oven at 90 degrees to the core. I have firebrick so that's what I'm using. Hopefully it will function satisfactorily despite not having insulating fire brick?
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Post by SteveStuff on Mar 24, 2017 18:25:21 GMT -8
While I wonder how much of a vortex street you are really getting considering the port right behind the tubes influence on it, here are some interesting CFD analyses of a few shapes. The square (turned parallel to the port) is interesting. The second shows 1, 2, and 3 cylinders. The third is a great one showing the "fluid" having to go through a port at the end. Most of these would probably be better tested in a J-tube given the distance to the port but I thought they were interesting and kind-of apply here. I wish I could find more with a port at the far end for different shapes.
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Post by SteveStuff on Mar 24, 2017 18:37:39 GMT -8
As well as this one. The beginning 1/3rd of this video is what I think the "throat" walls may be doing to the street if the port is too close to it. Possibly why when you moved it closer, you got negative results. I know moving the port back further reduces room for fuel but have you tried that at all? Thanks for documenting all of this so well for all of us Matt!
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Post by ronyon on Jul 17, 2018 23:01:14 GMT -8
Hey Matt, is there a standard % of system CSA that you aim for?
I know you use 2" pipe for 6" systems,but I'm building a little bigger,7".
My floor channel is huge, I plan on choking it down at the intake,using an adjustable plug.
You mention 9% of csa early on in this thread, but that was quite a while ago.
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Post by matthewwalker on Jul 18, 2018 12:38:31 GMT -8
I'm still using the same measurements and ratios, I played with it all quite a bit and that is a good balance. I'd say stick with the original 9% figure.
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