Air–water flow in a vertical pipe: experimental study of air bubbles in the vicinity of the wall
This study deals with the influence of bubbles on a vertical air–water pipe flow, for gas-lift applications. The effect of changing the bubble size is of particular interest as it has been shown to affect the pressure drop over the pipe. Local measurements on the bubbles characteristics in the wall...
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| Veröffentlicht in: | Experiments in fluids 2008-08, Vol.45 (2), p.357-370 |
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| container_title | Experiments in fluids |
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| creator | Descamps, M. N. Oliemans, R. V. A. Ooms, G. Mudde, R. F. |
| description | This study deals with the influence of bubbles on a vertical air–water pipe flow, for gas-lift applications. The effect of changing the bubble size is of particular interest as it has been shown to affect the pressure drop over the pipe. Local measurements on the bubbles characteristics in the wall region were performed, using standard techniques, such as high-speed video recording and optical fibre probe, and more specific techniques, such as two-phase hot film anemometry for the wall shear stress and conductivity measurement for the thickness of the liquid film at the wall. The injection of macroscopic air bubbles in a pipe flow was shown to increase the wall shear stress. Bubbles travelling close to the wall create a periodic perturbation. The injection of small bubbles amplifies this effect, because they tend to move in the wall region; hence, more bubbles are travelling close to the wall. A simple analysis based on a two-fluid set of equations emphasised the importance of the local gas fraction fluctuations on the wall shear stress. |
| doi_str_mv | 10.1007/s00348-008-0484-6 |
| format | Article |
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N.</creatorcontrib><creatorcontrib>Oliemans, R. V. A.</creatorcontrib><creatorcontrib>Ooms, G.</creatorcontrib><creatorcontrib>Mudde, R. F.</creatorcontrib><title>Air–water flow in a vertical pipe: experimental study of air bubbles in the vicinity of the wall</title><title>Experiments in fluids</title><addtitle>Exp Fluids</addtitle><description>This study deals with the influence of bubbles on a vertical air–water pipe flow, for gas-lift applications. The effect of changing the bubble size is of particular interest as it has been shown to affect the pressure drop over the pipe. Local measurements on the bubbles characteristics in the wall region were performed, using standard techniques, such as high-speed video recording and optical fibre probe, and more specific techniques, such as two-phase hot film anemometry for the wall shear stress and conductivity measurement for the thickness of the liquid film at the wall. 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| subjects | Air bubbles Bubbles Engineering Engineering Fluid Dynamics Engineering Thermodynamics Exact sciences and technology Fluid dynamics Fluid- and Aerodynamics Fundamental areas of phenomenology (including applications) Heat and Mass Transfer Instrumentation for fluid dynamics Mathematical analysis Multiphase and particle-laden flows Nonhomogeneous flows Physics Pipe Pipe flow Pressure drop Research Article Wall shear stresses Walls |
| title | Air–water flow in a vertical pipe: experimental study of air bubbles in the vicinity of the wall |
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