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Drop Deformation and Breakup Mechanisms in Viscoelastic Model Fluid Systems and Polymer Blends
Author(s) -
Mighri Frej,
Huneault Michel A.
Publication year - 2002
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.5450800603
Subject(s) - breakup , viscoelasticity , materials science , drop (telecommunication) , shearing (physics) , mechanics , shear flow , newtonian fluid , perpendicular , rheology , deformation (meteorology) , couette flow , shear rate , composite material , flow (mathematics) , physics , geometry , mechanical engineering , mathematics , engineering
This paper reviews the dispersion mechanisms in viscoelastic systems under relatively high shear rate conditions. In particular, two non‐Newtonian deformation and breakup mechanisms were revealed by flow visualization in a transparent Couette shearing setup. The first one is the dispersed droplet elongation perpendicular to the flow direction. This was observed only for viscoelastic drops and had been associated to normal force buildup in the droplet. The second deformation/breakup mechanism was observed in very high viscosity ratio polymer systems. It consists in erosion at the drop surface. Clouds of very small ribbons and sheets were developed around the drop then stretched and finally broken into very small droplets, rapidly distributed in the matrix.