Abstract
The axial and transverse velocity components in a right-angle branch have been measured using a two-dimensional laser Doppler velocimeter. The radius Rs of curvature along the upstream corner of the side branch is one half of trunk diameter D0. The experiment has been carried out for two flow division ratios at the Reynolds number of 800. Consequently, it is clarified that the sinusoidal variation of wall shear stress along the proximal wall of the side branch is induced by the secondary helical flow transferred from the trunk. The wall shear stress estimated from the axial velocity profile near the tube wall at the common median plane agrees fairly well with the result measured by the electrochemical method, employed in the previous study. Therefore, the electrochemical method is one of the most suitable methods for the measurement of wall shear stress in the range of liquid laminar flow.
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