Abstract
In the present study, the time variation of flow through the side branch of the right angle branch has been experimentally studied in the laminar steady flow by laser Doppler velocimeter. The side branch 14 mm in diameter bifurcates at right angle from the trunk 24.5 mm in diameter, and the shape of both upstream and downstream corners at the entrance of the side branch is square edge. The flow in the side branch periodically oscillates, and this oscillating flow is a characteristic phenomenon in the right angle branch. The Strouhal number based on the variables in the side branch is proportional to the Reynolds number. It is implied that the oscillating flow might be induced at the boundary between a small vortex formed in the reversing zone in the side branch and a large vortex in the core flow in the side branch. The rotating direction of the small vortex is the same as that of the large vortex.
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