著者
関 眞佐子
出版者
関西大学
雑誌
基盤研究(B)
巻号頁・発行日
2017-04-01

Segre-Silberberg効果は,流路内層流に浮遊する粒子が慣性に起因する揚力を受けることにより,流路下流の断面内で特定の位置に集中して流れる現象である.本研究は,流体力学に基づき,流路内流れに浮遊する粒子の挙動と下流断面における粒子の分布を様々な条件において実験および数値シミュレーションにより解析した.得られた結果から,流路断面内における粒子の集中位置と集中パターンを詳細に調べ,粒子集中現象の決定因子を探索するとともに機序を検討した.
著者
稲垣 大志 中村 暢志 板野 智昭 関 眞佐子 兵頭 仁介
出版者
一般社団法人 日本機械学会
雑誌
日本機械学会論文集 (ISSN:21879761)
巻号頁・発行日
vol.83, no.850, pp.17-00042-17-00042, 2017 (Released:2017-06-25)
参考文献数
10

The water velocity field in a rectangular reservoir driven by a previously unexplored water streamer is investigated experimentally and numerically. Firstly, the velocity field on the water surface induced in a rectangular reservoir is estimated from trajectories of floating passive tracers. Secondly, the velocity at the several fixed points below the surface is directly measured with the aid of an electro-magnetic velocimetry. These measurements elucidate that the streamer activates an underwater circulation between the surface and the bottom in the reservoir. Additionally, a numerical simulation is examined to realise the induced three-dimensional flow below the water surface. The obtained results provide an evidence that the induced flow structure is three-dimensionally spiral, which is distinct from that induced by the water streamers traditionally utilized in aquacultural reservoirs. The investigated streamer may be utilized for the purpose to particularly enhance the underwater vertical mixing in aquacultural reservoir or purification plant.