抄録
The flow that the main flow is branched at a right angle is applied to the devided flux for the air conditioning duct. In recent year, the narrow spaces of building are made efficently use for the air conditioning duct. Therefor, the shapes of air conditioning ducts have a tendency to the two dimensional duct.
In this study, the flow phenomena to change the width of branch channel were visualized using the surface floating method when the main flow was blanched at a right angle. By the visualized results, the relation of the length and width of separation, the distance to reatachment point, and the changes of the width of branch channel and Reynolds number of main flow were made clear.
