Duct POrts
Duct POrts
(OP)
Ok, I have a problem. One of my contractors wants to move the centerline of a duct port from the center on the main trunk to 4" back. On all the ports in the main. Now normally I wouldn't worry about this but the ports are 22" wide (square) and the main is 36" wide.
He tells my bosses that this will IN NO WAY effect the air flow through the main or the ports. I know this is wrong as the ports will now be in the turbulent zone of the duct.
Also, the branches cause tubulence around them, and being off-center I believe that will only magnify this effect.
Has anyone delt with anything like this? I know what I know, but I need something to back myself up with. Equations, evidence, something.
I am going to search Knovel for something.
He tells my bosses that this will IN NO WAY effect the air flow through the main or the ports. I know this is wrong as the ports will now be in the turbulent zone of the duct.
Also, the branches cause tubulence around them, and being off-center I believe that will only magnify this effect.
Has anyone delt with anything like this? I know what I know, but I need something to back myself up with. Equations, evidence, something.
I am going to search Knovel for something.





RE: Duct POrts
RE: Duct POrts
There will be a laminar sublayer near the duct walls and the velocity distribution will be as per Prandtl's 1/7th power law. The idea of going for a center line is to get the advantage of equidistribution of velocity (along the cross section of a duct)
RE: Duct POrts