Dynamic behaviours of water droplets impacting on laser ablated surfaces

Research output: Contribution to journalArticle

Abstract

In order to reveal the underlying mechanism of surface microstructure-determined wetting states, this paper adopted Volume of Fluid (VOF) method to investigate the dynamic behaviours of water droplets impacting on surfaces with different structures at low and high Weber numbers. The simulation results showed that the high and stable pressure of air pockets is critical for the formation of the superhydrophobicity. A superhydrophobic substrate will result in shorter recoiling time and longer rebound time for water droplet than the hydrophobic substrate. Furthermore, superhydrophobic surface resulted in higher kinetic energy for water droplet than hydrophobic surfaces, which is the underlying mechanism of microstructure-enabled self-cleaning function. High-speed camera tests of laser processed surface microstructures were conducted to validate the observation in dynamic impacting simulation. The results in both high-speed camera testing and VOF simulation proved that water droplet will have a lower adhesion force when impacting superhydrophobic surface than hydrophobic surface.
LanguageEnglish
Article number123743
Number of pages16
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume580
Early online date8 Aug 2019
DOIs
Publication statusE-pub ahead of print - 8 Aug 2019

Fingerprint

Water
Lasers
water
lasers
high speed cameras
High speed cameras
microstructure
Microstructure
recoilings
Fluids
simulation
fluids
Substrates
Kinetic energy
cleaning
wetting
Wetting
Cleaning
adhesion
Adhesion

Keywords

  • superhydrophobic
  • VOF simulation
  • contact angle
  • high-speed camera

Cite this

@article{b58526255a09470880e8488b461f2ed3,
title = "Dynamic behaviours of water droplets impacting on laser ablated surfaces",
abstract = "In order to reveal the underlying mechanism of surface microstructure-determined wetting states, this paper adopted Volume of Fluid (VOF) method to investigate the dynamic behaviours of water droplets impacting on surfaces with different structures at low and high Weber numbers. The simulation results showed that the high and stable pressure of air pockets is critical for the formation of the superhydrophobicity. A superhydrophobic substrate will result in shorter recoiling time and longer rebound time for water droplet than the hydrophobic substrate. Furthermore, superhydrophobic surface resulted in higher kinetic energy for water droplet than hydrophobic surfaces, which is the underlying mechanism of microstructure-enabled self-cleaning function. High-speed camera tests of laser processed surface microstructures were conducted to validate the observation in dynamic impacting simulation. The results in both high-speed camera testing and VOF simulation proved that water droplet will have a lower adhesion force when impacting superhydrophobic surface than hydrophobic surface.",
keywords = "superhydrophobic, VOF simulation, contact angle, high-speed camera",
author = "Yukui Cai and Xichun Luo and Yankang Tian and Hasan, {Rashed Md Murad} and Wenlong Chang and Yi Qin",
year = "2019",
month = "8",
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doi = "10.1016/j.colsurfa.2019.123743",
language = "English",
volume = "580",
journal = "Colloids and Surfaces A: Physicochemical and Engineering Aspects",
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}

TY - JOUR

T1 - Dynamic behaviours of water droplets impacting on laser ablated surfaces

AU - Cai, Yukui

AU - Luo, Xichun

AU - Tian, Yankang

AU - Hasan, Rashed Md Murad

AU - Chang, Wenlong

AU - Qin, Yi

PY - 2019/8/8

Y1 - 2019/8/8

N2 - In order to reveal the underlying mechanism of surface microstructure-determined wetting states, this paper adopted Volume of Fluid (VOF) method to investigate the dynamic behaviours of water droplets impacting on surfaces with different structures at low and high Weber numbers. The simulation results showed that the high and stable pressure of air pockets is critical for the formation of the superhydrophobicity. A superhydrophobic substrate will result in shorter recoiling time and longer rebound time for water droplet than the hydrophobic substrate. Furthermore, superhydrophobic surface resulted in higher kinetic energy for water droplet than hydrophobic surfaces, which is the underlying mechanism of microstructure-enabled self-cleaning function. High-speed camera tests of laser processed surface microstructures were conducted to validate the observation in dynamic impacting simulation. The results in both high-speed camera testing and VOF simulation proved that water droplet will have a lower adhesion force when impacting superhydrophobic surface than hydrophobic surface.

AB - In order to reveal the underlying mechanism of surface microstructure-determined wetting states, this paper adopted Volume of Fluid (VOF) method to investigate the dynamic behaviours of water droplets impacting on surfaces with different structures at low and high Weber numbers. The simulation results showed that the high and stable pressure of air pockets is critical for the formation of the superhydrophobicity. A superhydrophobic substrate will result in shorter recoiling time and longer rebound time for water droplet than the hydrophobic substrate. Furthermore, superhydrophobic surface resulted in higher kinetic energy for water droplet than hydrophobic surfaces, which is the underlying mechanism of microstructure-enabled self-cleaning function. High-speed camera tests of laser processed surface microstructures were conducted to validate the observation in dynamic impacting simulation. The results in both high-speed camera testing and VOF simulation proved that water droplet will have a lower adhesion force when impacting superhydrophobic surface than hydrophobic surface.

KW - superhydrophobic

KW - VOF simulation

KW - contact angle

KW - high-speed camera

UR - https://www.sciencedirect.com/journal/colloids-and-surfaces-a-physicochemical-and-engineering-aspects

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DO - 10.1016/j.colsurfa.2019.123743

M3 - Article

VL - 580

JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects

T2 - Colloids and Surfaces A: Physicochemical and Engineering Aspects

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SN - 0927-7757

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