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Factors affecting the decay of batch liquid‐liquid dispersions
Author(s) -
Jeelani S. A. K.,
Pandit A.,
Hartland S.
Publication year - 1990
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.5450680605
Subject(s) - coalescence (physics) , sedimentation , reynolds number , mechanics , materials science , drop (telecommunication) , liquid liquid , exponential decay , exponential function , physics , chromatography , chemistry , mathematics , geology , nuclear physics , sediment , mathematical analysis , engineering , mechanical engineering , astrobiology , paleontology , turbulence
A model which predicts the shape of the time dependent sedimentation and coalescence profiles during batch decay, allowing for binary coalescence and increasing hold‐up in the sedimentation zone, and the effect of the height of the dense‐packed zone on the interfacial coalescence rate, is presented. The model is verified using the experimentally observed increase in drop size with time. Analysis of twenty five liquid‐liquid systems covering a wide range of physical properties, operating conditions and settler geometry indicates that sigmoidal or exponential sedimentation profiles are obtained depending on whether the initial Reynolds number is less or greater than unity, respectively.