Flow of Viscoelastic Polymer Solutions Through an Abrupt 2-to-1 Expansion

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Abstract
Developing centerline velocity and reattachment lengths were measured for viscoelasticpolymer solutions in an abrupt 2‐to‐1 expansion. Test fluids were characterized for shear stress and first normal stress difference using a Weissenberg Rheogoniometer. The deviation from inelastic behavior is examined for 0.31⩽n⩽0.58, 2.7⩽Re⩽116.0 and 0⩽We⩽0.195. No deviation from inelastic behavior was observed for We⩽0.047, while significant predevelopment of the flow field relative to inelastic behavior was observed for 0.047⩽We⩽0.114. A flow instability was observed for We⩾0.12. The conditions for unstable flow are compared to the reversed contraction flow and to criteria suggested in the literature.

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