Leipzig 1999 – scientific programme

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DRG: Deutsche Rheologische Gesellschaft

DRG 10: Suspensionen und Emulsionen

DRG 10.4: Talk

Wednesday, March 3, 1999, 10:40–11:00, HS 21

Suspensions in Elongational Flows - Characterization of the Flow Behavior and its Correlation to Application Properties — •Norbert Willenbacher — BASF AG, Polymer Research Laboratory, ZKM/R - G 201, D-67056 Ludwigshafen

Elongational (converging) flows play an important role in processing and application of multi-phase systems like dispersions or emulsions and corresponding formulations like coatings or inks. The flow behavior especially of strongly interacting colloidal systems in complex flow fields can not simply be described by shear viscosity data alone. Pressure drop measurements using appropriately chosen capillary geometries and the opposing jet rheometer are well suited means to characterize the elongational flow behavior of such fluids under technically relevant conditions and can for example be correlated to the runnability of paper coating colors, the atomization and sprayability of automotive coatings, or the flow induced aggregation of polymer dispersions during filtration.