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## double venturi

### David Woof on wed 13 aug 08

Jon=2C the venturi principle is easily visualized and understood from the =
cross section schematics in an auto repair manual or text on pre fuel injec=
tion carburetors. The accelerated rush of air thru the venturi assisted =
in the atomization of the gasoline which will not burn in a liquid state. T=
he gasoline was introduced into the mixture at the venturi "mouth".
=20
Restriction is only part of the concept. I think seeing a physical cross s=
ection of a venturi will help one get what Nils is talking about. I hope =
Nils will respond further on this interesting subject=3B he has the science=
and the math.
=20
David 3b. Re: DOUBLE VENTURIPosted by: "jonathan byler" jebyler2@GMAIL.COM=
Date: Wed Aug 13=2C 2008 5:51 pm ((PDT))Nils=2Cwon't the damper pretty wel=
l function like a second venturi=2C since it restricts the stack opening=2C=
or is there some advantage to a square=2C or even better=2C a round restri=
ction? =20
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### Nils Lou on wed 13 aug 08

RE: Robert Klander's question on the double venturi flue design. The =
venturi expression of 5-5/8" square at the top of the flue box functions =
at that point to augment the drafting as the exhaust gases then expand =
into the larger volume of the stack of 9'x9" or larger. The second =
venturi can be two or more courses above the damper=97the stack volume =
completes the effect of improving the draft as the gases move through =
the second venturi "orifice".=20

nils lou, professor of art
AAVC department
www.linfield.edu/~nlou
503.883.2274
"Play is the essence of creativity", Carl Jung

### jonathan byler on wed 13 aug 08

Nils,

won't the damper pretty well function like a second venturi, since it =20=

restricts the stack opening, or is there some advantage to a square, =20
or even better, a round restriction?

jon byler
3-D Building Coordinator
Art Department
Auburn University, AL 36849

On Aug 13, 2008, at 10:41 AM, Nils Lou wrote:

> RE: Robert Klander's question on the double venturi flue design. =20
> The venturi expression of 5-5/8" square at the top of the flue box =20
> functions at that point to augment the drafting as the exhaust =20
> gases then expand into the larger volume of the stack of 9'x9" or =20
> larger. The second venturi can be two or more courses above the =20
> damper=97the stack volume completes the effect of improving the draft =20=

> as the gases move through the second venturi "orifice".
>
> nils lou, professor of art
> AAVC department
> www.linfield.edu/~nlou
> 503.883.2274
> "Play is the essence of creativity", Carl Jung