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## Re: [Spridgets] Weber DCOE vs OER DCOE

 To: "Ron Soave" , Re: [Spridgets] Weber DCOE vs OER DCOE "Larry Daniels" Sun, 27 Sep 2009 07:09:06 -0500
 ```-------------------------------------------------- From: "Ron Soave" Sent: Sunday, September 27, 2009 6:27 AM To: Subject: Re: [Spridgets] Weber DCOE vs OER DCOE > --- On Sun, 9/27/09, Robert E. Shlafer wrote: >> "Reynolds Numbers" apply to liquids >> as far as I know (which is not that far in these respects) >> however, > > Reynold's number applies to all fluids, air included. Off the top of my > head at 6am - It is dimensionless, and is equal to the density times the > velocity of the fluid times effective diameter of the fuid passage divided > by the kinematic viscosity (rho*V*De/mu). For air, Reynold's number is > used to calculate the friction factor, and that's equal to .046/Re^.2 if > memory serves. The simplified form of Bernoulli in the case we are talking > about is that flow: W=density * Area * velocity. As you can see, there are > common terms in each equation, so you can manipulate them to come up with > a friction factor, but that factor will only tell you the friction per > unit length, hence my "nope". In fact, the throat reduction here makes the > air behave somewhere in between a swage and a sudden contraction. In both > cases, the friction factor varies non-linearly with the ratio of the > upstream and downstream areas. You want to keep it gradual, with a > reduction angle of less > than seven degrees for the inner edge of the boundary layer of flow. Throw > in additional effects of non-uniform flow fields due to the contraction > and the effect on the vena-contracta in the venturi throat and the > homogeneity of the flow and downstream mixture suffer. > > Or you could switch back to SUs. > > Off to the races, > Ron > _______________________________________________ I knew that. Not. _______________________________________________ Support Team.Net http://www.team.net/donate.html http://www.team.net/archive http://autox.team.net/mailman/listinfo/spridgets ```
 Current Thread Re: [Spridgets] Weber DCOE vs OER DCOE, (continued) Re: [Spridgets] Weber DCOE vs OER DCOE, David Ramsey Re: [Spridgets] Weber DCOE vs OER DCOE, Ron Soave Re: [Spridgets] Weber DCOE vs OER DCOE, Larry Miller Re: [Spridgets] Weber DCOE vs OER DCOE, JLC Re: [Spridgets] Weber DCOE vs OER DCOE, Robert E. Shlafer Re: [Spridgets] Weber DCOE vs OER DCOE, Robert E. Shlafer Re: [Spridgets] Weber DCOE vs OER DCOE, Ron Soave Re: [Spridgets] Weber DCOE vs OER DCOE, Robert E. Shlafer Re: [Spridgets] Weber DCOE vs OER DCOE, WeslakeMonza1330 Re: [Spridgets] Weber DCOE vs OER DCOE, WeslakeMonza1330 Re: [Spridgets] Weber DCOE vs OER DCOE, Larry Daniels <= Re: [Spridgets] Weber DCOE vs OER DCOE, Robert E. Shlafer Re: [Spridgets] Weber DCOE vs OER DCOE, Larry Miller Re: [Spridgets] Weber DCOE vs OER DCOE, Chris King Re: [Spridgets] Weber DCOE vs OER DCOE, corvallis