Film Behavior of Two-Phase Flow in a Horizontal Pipe with a Sudden Contraction

Fujimatsu, Takahiro; Kito, Mizuki; Kondo, Kengo

doi:10.1007/978-3-319-30602-5_61

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“…The authors have reported the flow regime transitions in a horizontal pipe with a sudden contraction and measured the water-drop size in the annular mist flow using immersion liquid method [14], [15]. In this paper, the effects of the contraction area ratio on film behaviour were investigated by flow observations and measurements of disturbance wave occurrence frequency in order to contribute the fundamental data concerning to film characteristics in air-water horizontal annular two-phase flow with a sudden contraction.…”

Section: Introductionmentioning

confidence: 99%

Two-Phase Flow Phenomena in a Horizontal Pipe With a Sudden Contraction: Effects of Contraction Ratio on Film Behaviour

Fujimatsu

Kito

Kondo

2019

Computational and Experimental Methods in Multiphase and Complex Flow X

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Experimental studies were conducted on the behaviour of water films in a horizontal pipe with a sudden contraction to achieve a fundamental understanding of the film mechanisms of annular flow using highspeed video imaging analysis. The sudden contraction area ratios AC = (d2 /d1) 2 = 0.36 and 0.64, where d1 is the inlet pipe diameter (50 mm) and d2 is the contracted pipe diameter were examined. The experiments were carried out for various values of superficial gas and liquid velocities. The superficial gas velocity after mixing (jG1) ranged from 18.02 to 24.41 m/s (the calculated velocity from the crosssectional at the sudden contraction was jG2 = 27.98-67.39 m/s) and the superficial liquid velocity (jL1) ranged from 8.62×10 -2 to 1.23×10 -1 m/s (jL2 = 1.35×10 -1 -3.42×10 -1 m/s). Four flow regimes were observed after the sudden contraction, namely, huge-wave (HW), two-dimensional disturbance wave (DW1) which is formed perpendicularly to a pipe axis having a distinct coherence, three-dimensional disturbance wave (DW2) which is formed obliquely to the pipe axis, and bow wave (DW3) which is transitional wave to "Misty wave" from DW2. The disturbance wave occurrence frequencies were studied under various conditions of flow rate combination of air and water. DW2 occurs over wide range of the superficial gas and liquid velocities. As the superficial gas velocity and the superficial liquid velocity increase, two-dimensional disturbance waves change into three-dimensional ones. The wave occurrence frequencies in the pipe with the sudden contraction ratio AC = 0.36 were mostly higher than those in the pipe with AC = 0.64.

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Section: Introductionmentioning

confidence: 99%