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Snapshots of three typical flow patterns in gas–water two-phase flows (the interval of each frame is 0.01 s). (a) Usg = 0.055 m/s, Usw = 0.443 m/s, slug (Kw > 60%); (b) Usg = 0.368 m/s, Usw = 0.295 m/s, slug(Kw < 60%); (c) Usg = 0.590 m/s, Usw = 1.105 m/s, churn; (d) Usg = 0.055 m/s, Usw = 0.884 m/s, bubble.
