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Numerical simulations of dispersive mixing of viscoelastic suspensions in a four-roll mill

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Abstract

The dispersive mixing of particles suspended in Newtonian and viscoelastic fluids in a four-roll mill is studied by direct numerical simulations. A fictitious domain method is used to handle the particle motion. To quantify the mixing, a proper mixing distribution function is defined. The combined effect of fluid rheology and particle-particle/particle-wall hydrodynamic interactions is addressed. At variance with the Newtonian case where the particle distribution remains uniform, the viscoelasticity-induced migration leads to a significant segregation process. The effect of the Deborah number (the product of the fluid relaxation time and the roll angular velocity), shear-thinning, particle concentration, and size on the microstructure evolution is thoroughly investigated.

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Authors and Affiliations

  1. Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, Universitá di Napoli Federico II, P.le Tecchio 80, 80125, Napoli, Italy

    Gaetano D’Avino & Pier Luca Maffettone

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  1. Gaetano D’Avino
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  2. Pier Luca Maffettone
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Correspondence to Gaetano D’Avino.

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D’Avino, G., Maffettone, P.L. Numerical simulations of dispersive mixing of viscoelastic suspensions in a four-roll mill. Rheol Acta 56, 695–706 (2017). https://doi.org/10.1007/s00397-017-1028-x

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  • DOI: https://doi.org/10.1007/s00397-017-1028-x

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