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Multi-phase Flow Velocity Measurement Technique using Shadow Graphic Images
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 Title & Authors
Multi-phase Flow Velocity Measurement Technique using Shadow Graphic Images
Ryu, Yong-Uk; Jung, Kwang-Hyo;
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Air-water flow measurements are of importance for the coastal and ocean engineering fields. Although kinematic investigations of the multi-phase flows have been conducted for long time, velocity measurements still are concerned with many researchers and engineers in coastal and ocean areas. In the present study, an imaging technique using shadowgraphy and fiber optic probe for velocity measurements of air bubbles is introduced. The shadow graphy image technique is modified from the typical image velocimetry methods, and optical fibers are used for the well-known intrusive coupled phase-detection probe system. Since the imaging technique is a non-intrusive optical method from the air, it is usually applied for 2D flows. On the other hand, the double fiber optic probes touch flows regardless of flow patterns. The results of the flow measurements by both methods are compared and discussed. The methods are also applied to the measurements of overtopping flows by a breaking wave over the structure fixed on the free surface.
Multi-phase flows;Bubble image velocimetry;Shadow graphy image technique;Fiber optic reflectometer;Overtopping flows;
 Cited by
기포흐름 측정을 위한 영상기법 및 광섬유센서 적용,류용욱;정태화;

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