Onset of rebound suppression in non-Newtonian droplets post-impact on superhydrophobic surfaces

@article{Dhar2019OnsetOR,
  title={Onset of rebound suppression in non-Newtonian droplets post-impact on superhydrophobic surfaces},
  author={Purbarun Dhar and Soumya Ranjan Mishra and Devranjan Samanta},
  journal={Physical Review Fluids},
  year={2019}
}
Droplet deposition after impact on superhydrophobic surfaces has been an important area of study in recent years due to its potential application in reduction of pesticides usage. Minute amounts of long chain polymers added to water has been known to arrest the droplet rebound effect on superhydrophobic surfaces. Previous studies have attributed different reasons like extensional viscosity, dominance of elastic stresses or slowing down of contact line in retraction phase due to stretching of… Expand

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References

SHOWING 1-10 OF 39 REFERENCES
Role and significance of wetting pressures during droplet impact on structured superhydrophobic surfaces
TLDR
The root mechanism behind the impalement of the droplet to a fully wetting state is revealed and analysis of the internal pressure and flow distribution also presents necessary justification for the existence of a partially impaled state. Expand
Two types of Cassie-to-Wenzel wetting transitions on superhydrophobic surfaces during drop impact.
TLDR
This study revisits the so-called Cassie-to-Wenzel transition under the broadly encountered situation of liquid drop impact and reports a new CWT which occurs during the drop recoil toward bouncing and provides a simple model based on impulse conservation which successfully captures the transition threshold. Expand
Post impact droplet hydrodynamics on inclined planes of variant wettabilities
Abstract Experimental investigations were carried out to elucidate the roles of surface wettability and inclination on the post-impact dynamics of droplets. The maximum spreading diameter andExpand
Interplay of substrate inclination and wettability on droplet impact dynamics
Experimental investigations were carried out to elucidate the role of surface wettability and inclination on the post impact dynamics of droplets. Maximum spreading diameter and spreading time wereExpand
Effect of polymer additives on the wetting of impacting droplets.
TLDR
By measuring the fluid velocity inside the impacting drop, it is shown that the extensional viscosity plays no role in the antirebound phenomenon and it is demonstrated that the observed effect is due to the stretching of polymer molecules as the droplet edge sweeps the substrate, retarding the movement of the receding contact line. Expand
Dynamics of non-Newtonian droplets.
TLDR
It is shown how non-Newtonian flow properties can be used to slow down the retraction sufficiently to completely inhibit rebound, and it is shown that the non- newtonian effects profoundly change the contact line dynamics. Expand
Drop impact experiments of non-Newtonian liquids on micro-structured surfaces
The spreading dynamics of Newtonian liquids have been extensively studied in hydrophilic and hydrophobic surfaces and their behaviors have been extensively explored over the last few years. However,Expand
Controlling droplet deposition with polymer additives
TLDR
By adding very small amounts of a flexible polymer to the aqueous phase, this work can inhibit droplet rebound on a hydrophobic surface and markedly improve deposition without significantly altering the shear viscosity of the solutions. Expand
Influence of Dynamic Surface Tension on the Spreading of Surfactant Solution Droplets Impacting onto a Low-Surface-Energy Solid Substrate
TLDR
It is shown that droplet retraction is drastically influenced by the adsorption kinetics of the surfactant which limits the return to equilibrium surface tension. Expand
Spreading of Boger fluid on horizontal surface
Abstract In this research we investigated the spreading of polyisobutylene solutions in polybutene on glass surfaces by measuring contact line speed as a function of dynamic contact angle. PolymerExpand
...
1
2
3
4
...