Abstract
Kinematics and dynamics of the viscoelastic flow in an axisymmetric 4 : 1 sudden contraction geometry are studied for a highly elastic polyisobutylene (PIB) based polymer solution (referred to as PIB-Boger fluid). The critical conditions for the onset of the elastic instabilities and the dynamics of the resulting secondary flows are measured for various flow rates. The spatio-temporal characteristics of the flow are determined by instantaneous pressure measurements and streakline photography. The nonlinear dynamics of the global flow field both upstream and downstream of the contraction plane are systematically examined. New dynamic flow behavior and elastic instabilities downstream of the contraction plane are reported. It is shown that the instantaneous pressure measurements along with flow visualization can be used as an effective tool to characterize viscoelastic flows in complex geometries.
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