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Estimation of mixing volumes in buoyant miscible displacement flows along near‐horizontal pipes
Author(s) -
Taghavi S.M.,
Frigaard I.A.
Publication year - 2013
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.21754
Subject(s) - mixing (physics) , laminar flow , mechanics , displacement (psychology) , turbulence , mixing patterns , dispersion (optics) , newtonian fluid , flow (mathematics) , front (military) , non newtonian fluid , geology , pipe flow , materials science , physics , optics , psychology , quantum mechanics , psychotherapist , oceanography
We present a methodological framework for estimating the degree of mixing between successive miscible fluids pumped along a near‐horizontal pipe. Either or both of the fluids can be non‐Newtonian, of Herschel–Bulkley type. Overall it is considered that the objective is to minimise mixing. In laminar regimes our estimates are based on front velocity of the leading displacement front. In turbulent regimes the spreading mechanism is dispersion. In addition to the estimates of mixing volumes/lengths, we also predict a minimal flow rate necessary in order to achieve a successful displacement of the residual fluid. © 2013 Canadian Society for Chemical Engineering