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Article Dans Une Revue Polymer Engineering and Science Année : 2013

Sources of irreversibilities in a perfectly Axisymmetric geometry at low Reynolds numbers

Résumé

In plastic industry, a large variety of polymeric materi- als are obtained by liquid–liquid mixing. Recently, a new type of mixer (later called RMX)—based on a con- vergent/divergent unit which favors elongational flow— was developed with improved efficiency in polymer blending compared to traditional shear flow-based devices such as internal mixers or extruders. The pres- ent study aims at identifying the possible origins of the higher dispersive and distributive mixing capability of this device. An experimental study, including flow visu- alization, and numerical simulations of creeping flows induced by this original device was carried out for Newtonian, shear-thinning and viscoelastic fluids. The predictedmixing capability is based on length stretch and Lyapunov exponent methods. Calculation results show a good agreement with experiments and highlight some fundamental mixing mechanisms, such as striation, for viscoelatic fluids.

Dates et versions

hal-01446959 , version 1 (26-01-2017)

Identifiants

Citer

C. Loux, G. Bouchet, M. Bouquey, R. Muller. Sources of irreversibilities in a perfectly Axisymmetric geometry at low Reynolds numbers. Polymer Engineering and Science, 2013, 54 (9), pp.2046 - 2056. ⟨10.1002/pen.23757⟩. ⟨hal-01446959⟩
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