Journal of Flow Visualization and Image Processing

ISSN for PRINT: 1065-3090

For Online Access

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2000, Volume7

Issue 1

92 pages

Issue price - $140.00

Akiyuki Yonekawa
Department of Aeronautics and Astronautics, University of Tokyo, Tokyo, Japan

Toshinori Watanabe
Department of Aeronautics and Astronautics, University of Tokyo, Tokyo 113-8656, Japan

Oscillatory water flows in a branched tube were visualized by tracer methods to obtain a fundamental view of the flow phenomena effective for the enhancement of gas exchange in the human lung system. From the results, longitudinal vortices were found in the branched region, which were well known as the secondary flow vortices in a curved flow channel. The longitudinal vortices were observed to interact with the flow separation at the branch position, and to cause strong mixing. The effect of the longitudinal vortices on mass transport in the flow was studied from the measurement of the local concentration of the mingled ink in water in a curved tube where a pair of longitudinal secondary vortex was generated. The results revealed that the effective diffusion coefficient in the curved tube was about 3.2 times larger than that in a straight tube for the studied case.

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