Symmetry breaking in drop bouncing on curved surfaces

  title={Symmetry breaking in drop bouncing on curved surfaces},
  author={Yahua Liu and Matthew Andrew and Jing Li and Julia M. Yeomans and Zuankai Wang},
  journal={Nature Communications},
The impact of liquid drops on solid surfaces is ubiquitous in nature, and of practical importance in many industrial processes. A drop hitting a flat surface retains a circular symmetry throughout the impact process. Here we show that a drop impinging on Echevaria leaves exhibits asymmetric bouncing dynamics with distinct spreading and retraction along two perpendicular directions. This is a direct consequence of the cylindrical leaves that have a convex/concave architecture of size comparable… 

Enhancing the Asymmetry of Bouncing Ellipsoidal Drops on Curved Surfaces.

  • S. Yun
  • Physics
    Langmuir : the ACS journal of surfaces and colloids
  • 2020
Experimental and numerical results show that ellipsoidal shapes create the synergy effect of a preferential flow along the curved side, thereby leading to a significant reduction in the residence time when the drop's major axis coincides with the cylinder's axial direction.

Variation of the Contact Time of Droplets Bouncing on Cylindrical Ridges with Ridge Size.

The crossover between the two regimes is investigated and it is explained why the contact time is minimized when the radii of the drop and the cylindrical obstacle are comparable.

Droplet Asymmetric Bouncing on Inclined Superhydrophobic Surfaces

It is shown that a drop impacting on inclined superhydrophobic surfaces exhibits an asymmetric rebound with a distinctive spreading and retraction along the lateral and tangential directions, which endows a fast drop detachment.

Triggering of flow asymmetry by anisotropic deflection of lamella during the impact of a drop onto superhydrophobic surfaces

A water drop impacting a superhydrophobic surface (SHS) rebounds completely with remarkable elasticity. For a given drop size, the time of contact on a flat SHS remains constant. However, recent

Symmetry-Breaking Drop Bouncing on Superhydrophobic Surfaces with Continuously Changing Curvatures

The underlying principle of modifying the residence time via the drops’ ellipticity and initial surface curvature is elucidated based on momentum asymmetry and will offer practical implications for enhanced heat transfer performances and controlled water repellency, etc.

Controlling the residence time of a bouncing drop with asymmetric shaping.

This study investigates the bouncing dynamics of egg-shaped footprint drops to prove the concept of controlling the residence time with asymmetric shaping in an electrohydrodynamic device and describes the exceptional impact dynamics and the reduced contact time.

Triggering flow asymmetry by lamella deflection during drop impact on superhydrophobic surfaces

Water drop impacting a superhydrophobic surface (SHS) rebounds completely with remarkable elasticity. For such an impact, the balance between the inertial and capillary forces ascertain the contact

Bouncing dynamics of liquid drops impact on ridge structure: an effective approach to reduce the contact time.

A ridge structure is designed that can induce the drop to rapidly rebound through the combination effect of centre-drawing recoil and the resulting faster retraction velocity, which would open up a new way to reduce the contact time and control the bouncing dynamics of metal drops.

Bouncing of an ellipsoidal drop on a superhydrophobic surface

  • S. Yun
  • Physics
    Scientific Reports
  • 2017
The experimental result shows that the bouncing of the ellipsoidal drop can reduce the contact time and maximum bounce height below the spherical one by at least 30% and 60%, respectively.

On the fate of a drop jumping over a gap

Abstract Droplets impinging on solid surfaces, as well as the countless varieties of the resulting possible dynamics, are found frequently in both natural and industrial environments. Among such



Dynamics of collapse of air films in drop impact.

Nanometer- and microsecond-resolved dual wavelength interferometry reveals a complex evolution of the interface between the drop and the gas layer underneath that eventually leads to the nucleation of solid-liquid contact at a The authors-dependent radial position, from a film thickness >200  nm.

Pancake bouncing on superhydrophobic surfaces

By designing surfaces with tapered micro/nanotextures which behave as harmonic springs, the timescales become independent of the impact velocity, allowing the occurrence of pancake bouncing and rapid drop detachment over a wide range of impact velocities.

Fast drop movements resulting from the phase change on a gradient surface.

The movement of liquid drops on a surface with a radial surface tension gradient is described here and has implications for passively enhancing heat transfer in heat exchangers and heat pipes.

Wettability-independent bouncing on flat surfaces mediated by thin air films

The impingement of drops onto solid surfaces1, 2 plays a crucial role in a variety of processes, including inkjet printing, fog harvesting, anti-icing, dropwise condensation and spray coating3, 4, 5,

Retraction dynamics of aqueous drops upon impact on non-wetting surfaces

We study the impact and subsequent retraction of liquid droplets upon high-speed impact on hydrophobic surfaces. Extensive experiments show that the drop retraction rate is a material constant and

Pancake bouncing: simulations and theory and experimental verification.

This work uses mesoscale simulations and theoretical arguments, compared to experimental data, to show that "pancake bouncing" occurs when impacting fluid that enters the surface is slowed and then expelled by capillary forces.

Controlling drop bouncing using surfaces with gradient features

Drop hitting on superhydrophobic surfaces usually undergoes spreading and retraction stages before its complete rebound and there exists a minimum amount of time for the spreading and retraction

Drops can bounce from perfectly hydrophilic surfaces

Drops are well known to rebound from superhydrophobic surfaces and from liquid surfaces. Here, we show that drops can also rebound from a superhydrophilic solid surface such as an atomically smooth

Directed rebounding of droplets by microscale surface roughness gradients

Impact dynamics of water droplets on superhydrophobic surfaces with different textures are known to vary dramatically, from total rebounding to complete sticking. Here we show that droplet rebounding

Drop impact and rebound dynamics on an inclined superhydrophobic surface.

Investigating the impact and rebound dynamics of a drop at various liquid viscosities, in an isothermal environment, and on a nanocomposite superhydrophobic surface at normal and oblique impact conditions revealed that oblique and normal drop impact behaved similarly (in terms of maximum drop spread as well as rebound dynamics) at low normal Weber numbers.