Influence of elastic properties on drop deformation in elongational flow

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Abstract
We report experimental results on the deformation of a single drop suspended in a medium under uniaxial elongational flow along the central axis of a converging conical channel made of Plexiglas. Both the drop and the continuous phases consist of constant viscosityelastic fluids, so-called Boger fluids. This study reveals several interesting features about the role played by both the drop and matrix elasticities on the dropdeformability. In a given matrix fluid, the dropdeformation decreases as its elasticity increases. For a given drop fluid, the matrix elasticity has the opposite effect: the dropdeformation increases with increasing matrix elasticity. An empirical relation between the drop and matrix deformations is established as a function of the drop and matrix characteristicelastic times.

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