Regensburg 2019 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 32: Complex Fluids and Soft Matter (joint session DY/CPP)
DY 32.2: Talk
Wednesday, April 3, 2019, 15:30–15:45, H3
Breakup of a particulate suspension jet — •Joris Chateau1, 2 and Henri Lhuissier1 — 1CNRS, Aix-Marseille University, Marseille, France — 2Max Planck Institute, Gottingen, Germany
As viscosity is increased, a liquid capillary jet accelerated by gravity stretches over increasingly large distances before eventually breaking up. This Newtonian behavior is profoundly altered for particulate suspensions. Adding solid particles to a liquid, which increases the effective viscosity, can paradoxically shorten the jet considerably. This apparent contradiction is rationalized by considering finite size effects occurring at the scale of a few particles. A model is presented which captures the breakup length of suspension jets observed experimentally for a broad range of liquid viscosities, particle sizes and extrusion velocities of the jet, and recovers the Newtonian case for vanishing particle sizes. These results can be readily extended to any stretched jet configuration and potentially to other fluid media having a granularity.