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Detection and analysis of transition from annular to intermittent flow in vertical tubes
Author(s) -
Das Ramkrishna,
Pattanayak S.
Publication year - 1996
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450740107
Subject(s) - capillary action , mechanics , instability , amplitude , flow (mathematics) , capillary wave , materials science , core (optical fiber) , optics , physics , surface wave , composite material
In vertical co‐current gas‐liquid flow, the transition from annular to intermittent flow occurs when gas core becomes interrupted by liquid bridges due to the instability of the interfacial capillary waves. An analytical model is formulated to explain the liquid bridging in terms of the growth of finite amplitude interfacial capillary waves. Experimental results show that the longest wave length, which is associated with the transition, is about eight times the wave length of waves moving with the velocity of the liquid film.