Colloidal stability dictates drop breakup under electric fields

Abstract

Suspension stability on time scales of drop deformation leads to rich and unexplored breakup phenomena.

Electrohydrodynamic Jet Printing: Introductory Concepts and Considerations

“…However, when sufficient surfactant is added, this drops down to 2.5 kV cm −1 . [ 62 ] However, they do not study the droplets within the framework of EHD printing, their results highlight the significance of surfactants on the EHD properties that inks can exhibit.…”

“…In an aforementioned study by Lanauze et al, the influence of a colloid within a droplet is also probed. [ 62 ] By comparing the deformation behavior of a droplet of squalane suspended in silicone oil which contains carbon black particles, to a pure squalane droplet, they make two important observations. First, where the colloid is unstable, meaning that the particles are not homogenously distributed, flocculation occurs much more quickly upon the application of an electric field.…”

Droplet deformation and breakup in shear flow of air

“…For instance, in a double-swirl combustion chamber of a jet engine, fuel droplets break up under the shear of a double swirl 31,32 . There have been many studies on the fragmentation of droplets in liquids (i.e., liquid-liquid system) due to shear [33][34][35][36] . However, the density ratio and the viscosity ratio of the two phases in the liquid-liquid system are both low, different from the high viscosity ratio and the high density ratio of droplet breakup in airflow.…”

Electrocoalescence of water droplets in sunflower oil using a novel electrode geometry

“…However, droplets break up if the intensity is set to a too high value, resulting in the formation of fine secondary droplets that are much more difficult to remove from the oil [11,[22][23][24][25][26][27][28]. One of the pioneering investigations on the effect of electric field frequency on droplets coalescence was conducted by Brown and Hanson [29].…”