Abstract
The Hele-Shaw flows of a Newtonian fluid have been used to reproduce the flow patterns of two-dimensional potential flow. In the earlier papers, the present authors showed effects of elasticity on Hele-Shaw flows around a circular and a square cylinder, and a flow passing through a slit, and presented a new method to estimate the planar extensional viscosity from the slit flow pattern. In this study, the method is improved and tested using four polymer solutions. A new photochromic visualization technique is developed and applied to investigate the velocity field to confirm the validity of the improved method.
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