Turbulent Bubbly Channel Flow Investigated by Ultrasound Velocity Profiler
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概要
- 論文の詳細を見る
Ultrasound velocity profiler (UVP) is applied to measurements of a horizontal turbulent bubbly channel flow to ascertain the mechanism of bubble-induced frictional drag reduction. Typical parameter regimes of the target flow are Re number of 0.6-6.0 x104, void fraction of 0-3%, and bubble diameter of 10-50mm. Since the UVP system only outputs velocity profiles on an ultrasound beam inside a liquid phase, a signal processing method for raw velocity data is proposed and used to detect the bubble interface. A conditional averaged liquid phase velocity profile that excludes gas phase data, has shown for the first time the structure of a turbulent boundary layer altered by large buoyant bubbles sliding along the channel wall.
- 一般社団法人 日本機械学会の論文
著者
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FUJII Hideki
Division of Hypertension and Nephrology
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Murai Yuichi
Division Of Energy & Environmental Systems Graduate School Of Engineering Hokkaido University
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Tasaka Yuji
Division of Energy & Environmental Systems, Graduate School of Engineering, Hokkaido University
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Takeda Yasushi
Division of Energy & Environmental Systems, Graduate School of Engineering, Hokkaido University
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TASAKA Yuji
Division of Energy & Environmental System, Graduate School of Engineering, Hokkaido University
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MURAI Yuichi
Division of Energy & Environmental System, Graduate School of Engineering, Hokkaido University
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FUJII Hideki
Division of Energy & Environmental System, Graduate School of Engineering, Hokkaido University
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