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Influence of normal stress difference on polymer drop deformation
Author(s) -
Levitt Leon,
Macosko Christopher W.,
Pearson Scott D.
Publication year - 1996
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.10561
Subject(s) - materials science , composite material , drop (telecommunication) , polymer , deformation (meteorology) , stress (linguistics) , mechanical engineering , engineering , linguistics , philosophy
Polypropylene drops of varying viscosity and elasticity were sheared in a polystyrene matrix. Two transparent, counter‐rotating parallel disks provided simple shear flow. By adjusting the speed of one disk the drop center was fixed in the laboratory frame and deformation followed via high magnification video camera. It was found that with high matrix elasticity drops of the minor phase stretched perpendicular ( x 3 ) to the flow direction ( x 1 ). This is the first report of widening of drops in shear flow. An analytical relation was established between the second normal stress differences of the phases and degree of widening. The formation of sheets and the phenomena of widening results in a larger than affine area generation.