Droplet impact dynamics on micropillared hydrophobic surfaces

  title={Droplet impact dynamics on micropillared hydrophobic surfaces},
  author={Nagesh D. Patil and Rajneesh Bhardwaj and Atul Kumar Sharma},
  journal={Experimental Thermal and Fluid Science},

Droplet Bouncing and Breakup during Impact on a Microgrooved Surface.

The proposed regime map suggests the existence of a critical Weber number or pitch for the transition from one regime to the other and provides insights into the mechanism of liquid penetration into the grooves of a hydrophobic microgrooved surface.

Numerical research on the dynamic characteristics of a droplet impacting a hydrophobic tube

Numerical researches concerning various outcomes during single liquid droplet impact on tubular surfaces with different hydrophobicity values are carried out using a coupled level set and

Simultaneous Effect of Droplet Temperature and Surface Wettability on Single Drop Impact Dynamics

In this paper, the influence of the liquid droplet temperature on thermo–hydrodynamics of a single droplet impinging on surfaces having different hydrophobicities is experimentally investigated.

Theoretical Modelling of Droplet Extension on Hydrophobic Surfaces

In this work, droplet impact dynamics on hydrophobic surfaces under different wettability and impact conditions are examined numerically. Multi-phase finite volume simulations are carried out by

Following or Against Topographic Wettability Gradient: Movements of Droplets on a Micropatterned Surface.

The results show that the migration trajectory of the droplet is determined by the coexistence of Cassie and Wenzel states and the unbalanced Young's force, which are related to the impact velocity, pillar height, and surface tension.

A Study on the Effects of Surface Patterns on Droplet Impingement Behaviors

: In this paper, the hydrophobic rough surfaces were prepared by employing a conventional nano-imprint lithography technique, and the effects of surface parameter, ratio of the top surface to the

Droplet Impact on Asymmetric Hydrophobic Microstructures

Textured hydrophobic surfaces that repel liquid droplets unidirectionally are found in nature such as butterfly wings and ryegrass leaves and are also essential in technological processes such as

Wetting dynamics of a water droplet on micro-pillar surfaces with radially varying pitches.

Theoretical models developed using the Cassie-Baxter and Wenzel states for the radially increasing and radially decreasing pitches satisfactorily predict the experimental behaviours of a sessile droplet on square micro-pillar substrates with radially varying pitches.

Experimental and Model Studies of Various Size Water Droplet Impacting on a Hydrophobic Surface

Impacting droplet on a hydrophobic surface is investigated and droplet size effect on impacting properties is examined. Liquid pressure variation inside droplet is numerically simulated in the



Drop impact upon micro- and nanostructured superhydrophobic surfaces.

The results imply that the multiscale surface roughness at nanoscale plays a minor role in the impact events for small The authors less than or approximately equal 120 but an important one for large They greater than or about equal 120.

Dynamic wetting and spreading characteristics of a liquid droplet impinging on hydrophobic textured surfaces.

  • Jae Bong LeeS. Lee
  • Materials Science
    Langmuir : the ACS journal of surfaces and colloids
  • 2011
It is found that for textured surfaces the measured apparent contact angle takes on values of up to 125.83°, compared to a CA of approximately 80.59° for a nontextured bare surface, and that the spreading factor decreases with the increased texture area fraction because of increased hydrophobicity, partial penetration of the liquid, and viscous dissipation.

Dynamic effects of bouncing water droplets on superhydrophobic surfaces.

  • Y. JungB. Bhushan
  • Engineering, Physics
    Langmuir : the ACS journal of surfaces and colloids
  • 2008
The dynamic impact behavior of water droplets on micropatterned silicon surfaces with pillars of two different diameters and heights and with varying pitch values is studied and a criterion for the transition from the Cassie and Baxter regime to the Wenzel regime based on the relationship between the impact velocity and the parameter of patterned surfaces is proposed.

Effects of hydraulic pressure on the stability and transition of wetting modes of superhydrophobic surfaces.

The underlying mechanisms of stability, metastability, or instability of the Cassie-Baxter and Wenzel wetting modes and their transitions on superhydrophobic surfaces decorated with periodic micropillars are quantitatively studied and proposals for a mixed wetting mode are proposed.

Dynamic effects induced transition of droplets on biomimetic superhydrophobic surfaces.

  • Y. JungB. Bhushan
  • Engineering, Physics
    Langmuir : the ACS journal of surfaces and colloids
  • 2009
A new model for the prediction of the wetting and dewetting process during droplet vibration based on the relationship between the adhesion force and the inertia force of a droplet is proposed.

Wetting Transition Characteristics on Microstructured Hydrophobic Surfaces

Hydrophobicity and wetting transition behavior of water droplets were investigated on microstructured hydrophobic rough surfaces with pillar arrays, fabricated by self-replication with hydrophobic

Impact dynamics and rebound of water droplets on superhydrophobic carbon nanotube arrays

The authors report the impact response of water droplets impinging on superhydrophobic carbon nanotube arrays and observe that arrays with different wetting properties display significantly different

Capillary effects during droplet impact on a solid surface

Impact of water droplets on a flat, solid surface was studied using both experiments and numerical simulation. Liquid–solid contact angle was varied in experiments by adding traces of a surfactant to

Pyramidal and toroidal water drops after impact on a solid surface

Superhydrophobic surfaces generate very high contact angles as a result of their microstructure. The impact of a water drop on such a surface shows unusual features, such as total rebound at low

Impact dynamics of water droplets on Cu films with three-level hierarchical structures

Three Cu films with different three-level hierarchical structures were fabricated using a one-step electric brush-plating technique. Impact dynamics of water droplets on three Cu films was