Countercurrent_web

Countercurrent_web - ENU 4134 Counter-Current Two-Phase...

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ENU 4134 – Counter-Current Two-Phase Flow D. Schubring October 5, 2009
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Empirical Analysis of Two-Phase Fluid Mechanics Schedule I Flow Regime Maps – 1 I Annular Flow – 1.5 I Bubbly Flow – 0.75 I Other flow regimes (intermittent and horizontal) – 0.75 I Counter-current two-phase flow – 0.5 I Pressure drop models – 2.5
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Counter-current Flow Flow regime transition in counter-current flow tend to be sudden , indicative of fluid instability-based changes. The transition from counter-current (gas upward, liquid downward) to co-current (upward) is termed flooding . The transition from co-current (upward) to counter-current (gas upward, liquid downward) is termed flow reversal . Small-scale flow reversals may be linked to the transition from annular to churn flow.
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Dimensionless Numbers for Flooding/Reversal/etc. A nondimensional film thickness (not usually given a name): δ ? = δ ± g cos( θ ) ν 2 l ² 1 / 3 (1) Note that this is not δ + . In this equation, θ is angle from vertical
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Countercurrent_web - ENU 4134 Counter-Current Two-Phase...

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