Drop impact experiments of non-Newtonian liquids on micro-structured surfaces

Abstract

The spreading dynamics of Newtonian liquids have been extensively studied in hydrophilic and hydrophobic surfaces and its behavior has been extensively explored over the last years. However, drop impact of Non-Newtonian liquids still needs further study. Luu and Forterre (J. Fluid Mech., 632, 2009) successfully found scaling laws for yield-stress fluids on hydrophilic surfaces. They also uncovered interesting and yet unexplained regimes when the impact was performed on a superhydrophobic surface. In this work, we perform drop impact experiments on micro-patterned surfaces with two types of non-Newtonian liquids: one showing shear-thickening behavior and another one showing shear-thinning. Our results show that a typical shear-thickening liquid as cornstarch -at least a the relatively low concentration of 30\%w/w- spreads according to the scaling laws of Newtonian liquids, whereas visco-elastic liquids as Carbopol behave as predicted by Luu and Forterre for impact on hydrophilic surfaces, but show different scaling laws when they impact on superhydrophobic surfaces.

arXiv comment8 pages, 10 figures

References in corpus (4)

• Drop Splashing on a Dry Smooth Surface
• Shear thickening of cornstarch suspensions as a re-entrant jamming transition
• How micropatterns and air pressure affect splashing on surfaces
• Persistent holes in a fluid

Cited by in corpus (8)

• Drop impact of shear thickening liquids
• Splashing onset in dense suspension droplets
• Droplet impact on surfaces with asymmetric microscopic features
• From splashing to bouncing: the influence of viscosity on the impact of suspension droplets on a solid surface
• Surface impacts and collisions of particle-laden nanodrops
• Thixotropy in Viscoplastic Drop Impact on Thin Films
• Drop Impact Dynamics of Complex Fluids: A Review
• Droplet splashing during the impact on liquid pools of shear-thinning fluids with yield stress