2phase - MULTIPHASE FLOW plicate than singlephaseflow d...

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MULTIPHASE FLOW More complicated than single phase flow. Flow pattern is not simply laminar or turbulent. Types of multiphase flow: Solid-fluid flows (e.g. particulate flows) Liquid-liquid flows Gas-liquid flows Three-phase flows. Due to density differences, horizontal flows are different than vertical flows. Cocurrent flows are different than countercurrent flows. Phase changes should be taken into account when present. ChE 4253 - Design I
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Multiphase Flow (gas-liquid) Horizontal Vertical Dispersed Annular Stratified Churn or froth Wavy Slug Plug Bubble ChE 4253 - Design I
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Multiphase Flow (gas-liquid) Note: Each phase travels with its own velocity. Flow regime is a matter of visual interpretation and subjective to the person who takes the measurements. Transition from one regime to another is gradual. Literature: Ginoux, J.J., "Two-Phase Flow and Heat Transfer," Hemisphere Publishing, 1974. General information about two-phase flows. Wallis, G.B., "One-Dimensional Two-Phase Flow," McGraw-Hill, 1969. General information about two-phase flows. Cocurrent Horizontal flows: Low liquid velocity: Stratified flow, wavy flow, annular flow Intermediate liquid velocity: Plug flow, slug flow, annular flow Large liquid velocity: Bubbly flow, spray or mist flow. Gas velocity ChE 4253 - Design I
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Oil and gas wells Length: 1500 - 6000 m Diameter : 0.05 - 0.2 m Inclination angle : 90 to 0 degrees Subsea flow lines Length: 100 - 3500 m (maximum 35 km) Diameter : 0.05 - 0.3 m Inclination angle : 0 to 90 degrees Gas export pipelines Length: 1-100 km Diameter : 0.2 - 1.2 m Inclination angle : -90 to 90 degrees ChE 4253 - Design I
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Flow regime maps Horizontal Pipes ChE 4253 - Design I
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Flow regime maps Vertical Pipes ChE 4253 - Design I
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Importance of flow regime predictions Flow regime specific flow models provide better prediction than “black box” models. Better predictions of dP and Holdup (volume fraction), if flow regime is known. Flow regime prediction is not only important for reliable design, but for pipeline operability. Phenomena like pipe corrosion and erosion depend on flow regimes. Distribution of corrosion, hydrate and wax inhibitors depend on flow regimes. Flow regime at pipe outlet affects gas-liquid separation efficiency ChE 4253 - Design I
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Multiphase Flow (gas-liquid) Typical Velocities (1in pipe) Regime Liquid Velocity Vapor Velocity (ft/sec) (ft/sec) Dispersed Close to vapor > 200 Annular <0.5 > 20 Stratified <0.5 0.5-10 Slug Less than vapor vel. 3-50 Plug 2 < 4 Bubble 5-15 0.5-2 ChE 4253 - Design I
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Multiphase Flow (gas-liquid) Flow regime maps Good for approximate prediction of flow characteristics. W
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2phase - MULTIPHASE FLOW plicate than singlephaseflow d...

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