Investigation of Bubble Size Effect on Vertical Upward Bubbly Two-Phase Pipe Flow Consisted With an Abrupt Expansion
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概要
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The effects of bubble size on an upward gas-liquid (CO2-water) flow in a vertical pipe after an abrupt expansion is investigated visually and experimentally in the present work. The mean bubble size varies from small scale (db=0.3mm) to relatively large scale (db=4.5mm). Extensive visualization experiments and PIV analysis show different flow patterns downstream of the expansion of flows containing bubbles of different sizes. The effect of bubble size is also investigated measuring the pressure distribution along the pipe and the drag of the expansion and its difference under different bubble sizes is calculated and compared with that of single-phase flow. The fluctuation phenomena occurring downstream are also investigated. The experiments are conducted under constant Reynolds number (Re=1.0×104) and volumetric gas flow rate ratio (αv=0∼10%). The present work gives valuable information about how the bubble size affects the flow characteristics even under steady flow conditions, and explains the differences between results reported by other authors investigating under similar conditions.
著者
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SHAKOUCHI Toshihiko
Graduate School of Engineering, Mie University
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TSUJIMOTO Koichi
Graduate School of Engineering, Mie University
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ANDO Toshitake
Graduate School of Engineering, Mie University
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VOUTSINAS Alexandros
Graduate School of Engineering, Mie University
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Ando Toshitake
Graduate School Of Engineering Mie University
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Tsujimoto Koichi
Graduate School Of Engineering Mie University
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Shakouchi Toshihiko
Graduate School Of Engineering Mie University
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Voutsinas Alexandros
Graduate School Of Engineering Mie University
関連論文
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- Investigation of Bubble Size Effect on Vertical Upward Bubbly Two-Phase Pipe Flow Consisted With an Abrupt Expansion
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- Foreword(Jets, Wakes and Separated Flows)
- Direct Numerical Simulation of Active-Controlled Impinging Jets
- Effects of Pressure Fluctuation on Flow-Accelerated Corrosion in the Downstream of Orifice Nozzle
- Preface