Abstract
Visualization and quantitative measurements of the velocity field of a laminar water flow through a branch tube of square cross section was made using a laser induced fluorescence (phosphorescence) method (LIP). Velocity profiles in two directions across the tube were visualized in totally 23 different cross sections located at the upper and lower streams of the branch portion along the flow direction. The wall shearing stress was obtained from these visualized velocity profiles and the map of the wall shearing stress over the whole flow field was obtained.
