AM06-08-010 強拡大PTVによるマイクロバブル流の壁面近傍流動構造の可視化(混相流・機能性流体(2),一般講演)

概要

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An experimental investigation has been made regarding a turbulent structure of a horizontal channel flow with microbubbles. In the present study, we approached by two techniques, one is a highly magnifying telecentric PTV system, and another is a shear stress measurement. In bubbly flow, the PTV measurement is hampered by existence of a large number of bubbles in optical path and scatter light on the bubble surface. The system enables clear measurements from closer distance by using rectangular prisms and telecentric lens, and bubbles' form measurements by using laser induced fluorescent and shadow imaging technique. The experiments have been carried out for flow conditions with Reynolds number ranging from 10,000 to 50,000 and void fraction up to 0.04. In the case of Re=30,000, it was confirmed that a reduction of a statistic velocity, turbulent intensity and wall shear stress.
日本流体力学会の論文
2006-09-05