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Annular flow of two immiscible liquids II. Analysis of core‐liquid ascent
Author(s) -
Hasson D.,
Nir A.
Publication year - 1970
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.5450480508
Subject(s) - buoyancy , mechanics , inertia , drag , core (optical fiber) , flow (mathematics) , materials science , volume of fluid method , geology , physics , classical mechanics , composite material
An analysis was made of the core‐liquid trajectory in the horizontal‐pipe flow of two annular immiscible liquids with a density difference. Evaluation of the vertical drag force resisting buoyancy was based on approximating the peripheral wall‐liquid drainage by local Couette flow integrated over the drainage passage. Inertia‐effect corrections to the Stokes solution were also taken into account from available information. Experimental wall‐liquid thicknesses, measured from highspeed photographs, were in excellent agreement with predicted trajectories for the case of a non‐wavy interface, as assumed in the model. With a wavy interface, upper‐film thickness was considerably larger than predicted, suggesting that in spite of their disrupting tendency, the waves also contribute towards annular‐flow stability.