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Two-Phase Gas/Liquid Pipe Flow - AIChE

Two-Phase Gas/Liquid Pipe Flow Ron Darby PhD, PE Professor Emeritus, Chemical Engineering Texas A&M University Types of Two-Phase Flow Solid-Gas Solid- liquid Gas- liquid liquid - liquid Gas- liquid Flow Regimes Homogeneous Highly Mixed Pseudo Single-Phase High Reynolds Number Dispersed Many Possibilities Horizontal Pipe Flow Vertical Pipe Flow Horizontal Dispersed Flow Regimes Vertical Pipe Flow Regimes Horizontal Pipe Flow Regime Map 1 / 2 GLAW 1 / 22 WLWLWLV ertical Pipe Flow Regime Map DEFINITIONS Mass Flow Rate , Volume Flow Rate (Q) Mass Flux (G): LGLLGGmmmQQ m GLLGmmmGGGAAA Volume Flux (J): Volume Fraction Gas: Vol. Fraction liquid : 1- Phase Velocity: GLLGmLGLGmGGGJJJQQVA GLLGJJV,V1 Slip Ratio (S): Mass Fraction Gas (Quality x): Mass Flow Ratio Gas/Liquid : GGLLmxSm1 - x1 - GLVSV GGLmxmmDensity of Two-Phase Mixture: where is the volume fraction of gas in the mixture mGL1 GLx x S 1 x / Holdup (Volume Fraction liquid ): GLGLS 1 x / 1 x S 1 x / Slip (S) Occurs because the gas expands and speeds up relative to the liquid .

Two-Phase Gas/Liquid Pipe Flow Ron Darby PhD, PE Professor Emeritus, Chemical Engineering ... Density of Two-Phase Mixture: where GL is the volume fraction of gas in the mixture U HU H U m G L 1 x 0 x S 1 x ! ! ... Air/Water 5 72.495 14.644 Air/Water 8 115.993 14.644

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