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Drop size distribution in highly concentrated liquid–liquid dispersions using a light back scattering method
Author(s) -
Lovick J,
Mouza AA,
Paras SV,
Lye GJ,
Angeli P
Publication year - 2005
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.1205
Subject(s) - drop (telecommunication) , sauter mean diameter , impeller , materials science , light scattering , surface tension , dispersion (optics) , analytical chemistry (journal) , optics , chromatography , composite material , scattering , chemistry , mechanics , thermodynamics , telecommunications , physics , computer science , nozzle
New data are presented on drop size distribution at high dispersed phase fractions of organic‐in‐water mixtures, obtained with a light back scattering technique (3 Dimensional Optical Reflectance Measurement technique, 3D ORM). The 3D ORM technique, which provides fast, in‐situ and on‐line drop distribution measurements even at high concentrations of the dispersed phase, is validated using an endoscope attached to a high‐speed video recorder. The two techniques compared favourably when used in a dispersion of oil (density (ρ) = 828 kg m −3 , viscosity (µ) = 5.5 mPa s, interfacial tension (σ i ) = 44.7 mN m −1 ) in water for a range of 5–10% dispersed phase fractions. Data obtained with the ORM instrument for dispersed phase fractions up to 60% and impeller speeds 350–550 rpm showed a decrease in the maximum and the Sauter mean drop diameters with increasing impeller speed. Phase fractions did not seem to significantly affect drop size. Both techniques showed that drop size distributions could be fitted by the log‐normal distribution. Copyright © 2005 Society of Chemical Industry