Liquid migration in shear thickening suspensions flowing through constrictions

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Abstract

Dense suspensions often become more dilute as they move downstream through a constriction. We find that as a shear-thickening suspension is extruded through a narrow die and undergoes such liquid migration, the extrudate maintains a steady concentration ϕLMout, independent of time or initial concentration. At low volumetric flow rate Q, ϕLMout is a universal function of Q/r3d, a characteristic shear rate in the die of radius rd, and coincides with the critical input concentration for the onset of LM, ϕcritin. We predict this function by coupling the Wyart-Cates model for shear thickening and the “suspension balance model” for solvent permeation through particles.
Original languageEnglish
Number of pages5
JournalPhysical Review Letters
Early online date16 Sep 2019
DOIs
Publication statusPublished - 20 Sep 2019

Keywords

  • cond-mat.soft

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