Experimental study of a non-viscometric flow: kinematics of a viscoelastic fluid at the exit of a cylindrical tube

In the scope of a study on non-viscometric flows of viscoelastic liquids, the authors have studied die-swell at the exit of a cylindrical tube. The work presents the determination of axial velocity profiles, by laser anemometry, from the nearly parabolic profile in the tube (compared to the Poiseuille curve computed with the Le Roy-Pierrard model) to the flat profile in the jet.The main conclusions are that the axial velocities are modified at more than one diameter upstream in the die and rigid body flow is attained at about one radius downstream.