Fragmentation of a viscous suspension jet

As viscosity is increased, a liquid capillary jet accelerated by gravity stretches over increasingly large distances before it eventually breaks up. Paradoxically, adding solid particles to the liquid, which increases the effective viscosity, shortens the jet considerably. At the light of experiments with capillary bridges and jets of suspensions of non-Brownian, density-matched, spherical particles with different particle sizes and a large particle volume fraction ($=50\%$), we will rationalize this apparent contradiction for the different regimes of jet break-up from the consideration of discrete particulate effects. Consequences will also be drawn for the size of the drops following the break-up.