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Liquid‐liquid flows in an inclined pipe
Author(s) -
Vigneaux P.,
Chenais P.,
Hulin J. P.
Publication year - 1988
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690340508
Subject(s) - volume fraction , volume (thermodynamics) , volumetric flow rate , mechanics , two phase flow , fraction (chemistry) , materials science , chemistry , analytical chemistry (journal) , geometry , flow (mathematics) , thermodynamics , chromatography , physics , mathematics , composite material
Experimental measurements are reported of oil‐water flows in a 20 cm ID pipe at mean velocities between 2.7 and 35 cm/s, at deviation angles θ from vertical between 0 and 65°, and at water flow rate fractions between 30 and 100%. The distribution of the water volume fraction α w across a pipe section is obtained using local high‐frequency probes. The mean water volume fraction in the section and the slip velocity V s between oil and water are also determined. High V s values (up to 50 cm/s) are measured at large deviation angles; they are associated with oil droplet swarms or continuous oil phase zones. Both α w profiles and V s values depend only on the mean water volume fraction and not on the total flow rate Q t in the range investigated. At low oil volume fractions α o , all droplets are concentrated close to the upper side of the pipe. At larger α o values, a slower linear variation of α w with the distance y from the axis is measured. A model is suggested relating the slope ∂α w /∂ y in a vertical plane to the existence of internal density waves in the stratified mixture.