Abstract
In the present study, the wall shear stress and flow structure in the right angle branch have been studied experimentally in laminar steady flow using a laser Doppler velocimeter. The side branch, 14 mm in diameter, bifurcates at a right angle from the trunk, 24.5 mm in diameter, and both upstream and downstream corners at the entrance of the side branch are square edged. There is a periodical change of velocity in the side branch, and the Strouhal number based on the variables of the side branch is constant to be St_S=1.03. This phenomenon is a characteristic flow structure in the right angle branch.
