有限容器内に形成されるくぼみ渦周りの流れ場の測定〔流体工学, 流体機械〕

概要

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Flow field around a bathtub vortex was investigated. A finite cylindrical vessel was used as a test section. The vessel had a tangential inlet open channel at the top, and a vertical outlet pipe at the bottom center. Flow field was visualized by ink dye and particle tracers, resulting in velocity distributions to be measured. The flow inside the vessel was mainly divided into two parts ; one was through the central region of the vessel, and another was along the wall of vessel, i.e., the side and bottom walls. Flow through the central region was found to increase its velocity in proportion to a distance from the free surface and to form a stagnant region along the vortex center under certain experimental conditions. The flow field and the vortex profile were determined by strength of circulation and flow rate in the central region. However, these local parameters complicatedly depended on the macro parameters such as total flow rate, the outlet pipe diameter and the depth of the vessel.
一般社団法人日本機械学会の論文
1997-10-25