Abstract
The flow structure in the right-angle branch has been experimentally studied in laminar steady flow with laser Doppler anemometry and particle image velocimetry. In the previous study, it was clarified that the velocity periodically oscillates in the side branch, and the Strouhal number is independent of cross-sectional area ratio, the flow division ratio of main branch-to-side branch, and the Reynolds number. The mechanism has not clarified adequately. There is another possibility that high shear rate is one of the factors inducing the periodical oscillation in side branch from a result of the velocity oscillation along the separation shearing layer from the entrance of side branch.
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