Abstract
| Original language | English |
|---|---|
| Article number | 123743 |
| Number of pages | 16 |
| Journal | Colloids and Surfaces A: Physicochemical and Engineering Aspects |
| Volume | 580 |
| Early online date | 8 Aug 2019 |
| DOIs | |
| Publication status | Published - 5 Nov 2019 |
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Keywords
- superhydrophobic
- VOF simulation
- contact angle
- high-speed camera
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Dynamic behaviours of water droplets impacting on laser ablated surfaces. / Cai, Yukui; Luo, Xichun; Tian, Yankang; Hasan, Rashed Md Murad; Chang, Wenlong; Qin, Yi.
In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 580, 123743, 05.11.2019.Research output: Contribution to journal › Article
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 - 2019/11/5
Y1 - 2019/11/5
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
U2 - 10.1016/j.colsurfa.2019.123743
DO - 10.1016/j.colsurfa.2019.123743
M3 - Article
VL - 580
JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects
JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects
SN - 0927-7757
M1 - 123743
ER -