Effect of elasticity on the potential flow pattern in a Hele-Shaw cell is investigated by using three polymer solutions. While the inertia effect of Newtonian fluid causes the streamline separate from the body at its rear side, the elasticity of polymer solutions generates recirculating bubble around the upstream stagnation point. Regions for the potential flow, the inertia-affected and the elasticity-affected patterns are presented on the Re-We plane.
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