scholarly journals Liquid Droplet Impact on a Sonically Excited Thin Membrane

Soft Matter ◽  
2022 ◽  
Author(s):  
A. Abubakr ◽  
Bekir Sami Yilbas ◽  
Hussain Al-Qahtani ◽  
Ammar Alzaydi
Keyword(s):  
Water Droplet ◽  
Liquid Droplet ◽  
Droplet Impact ◽  
Thin Membrane ◽  
Contact Duration ◽  
Hydrophobic Surfaces ◽  
Excitation Frequencies

Impacting droplet characteristics on hydrophobic surfaces can be altered by introducing surface oscillations. Impacting water droplet contact duration, spreading, retraction, and rebounding behaviors are examined at various sonic excitation frequencies...

Dynamic effects and adhesion of water droplet impact on hydrophobic surfaces: bouncing or sticking

Nanoscale ◽  
2017 ◽  
Vol 9 (24) ◽  
pp. 8249-8255 ◽  
Author(s):  
Zhiguang Li ◽  
Que Kong ◽  
Xiaoyan Ma ◽  
Duyang Zang ◽  
Xinghua Guan ◽  
...  
Keyword(s):  
Water Droplet ◽  
Droplet Impact ◽  
Dynamic Effects ◽  
Hydrophobic Surfaces

Numerical Investigation of Water Droplet Impact on Solid Surface in Microgravity

2013 ◽  
Vol 390 ◽  
pp. 65-70
Author(s):  
Jun Jun Tao ◽  
Jun Qin ◽  
Xue Han ◽  
Yong Ming Zhang
Keyword(s):  
Solid Surface ◽  
Water Droplet ◽  
Normal Gravity ◽  
Numerical Study ◽  
Liquid Droplet ◽  
Water Mist ◽  
Droplet Impact ◽  
Gravity Level ◽  
Vof Model ◽  
Fuel Vapour

A numerical study based on VOF model has been carried out to investigate the dynamics of water droplet impact on solid surface in microgravity in comparison with that in normal gravity to discuss the differences of the extinguishing mechanism of water mist in different gravity level. Water droplets with different initial diameters and impact velocities were considered. The simulated results show that the deformation process in microgravity lags behind that in normal gravity. And it was also found that Dmaxand spread velocities are smaller in microgravity as the potential energy decreases and the time taken for a liquid droplet to reach its maximum spread has no obvious regularity. Hence, the effect of cooling the fuel surface and diluting fuel vapour with water mist in microgravity may be not as good as that in normal gravity.The critical impact Weber number for water droplet breaking up in microgravity is lower than that in normal gravity as the reduction of the value of Bond number, which may result in diluting fuel vapour with water mist in microgravity being more effective than that in normal gravity in some case.

Ultra-Highspeed Optical Diagnostics of Water Droplet Impact, Breakup and Shock Boundary Layer Interactions of Hypervelocity Projectiles

2022 ◽  
Author(s):  
Gavin Lukasik ◽  
Jacob Rogers ◽  
Kalyan R. Kota ◽  
Rodney D. Bowersox ◽  
Thomas E. Lacy ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Water Droplet ◽  
Optical Diagnostics ◽  
Droplet Impact

scholarly journals Pressure generated at the instant of impact between a liquid droplet and solid surface

2018 ◽  
Vol 5 (12) ◽  
pp. 181101 ◽  
Author(s):  
Y. Tatekura ◽  
M. Watanabe ◽  
K. Kobayashi ◽  
T. Sanada
Keyword(s):  
Solid Surface ◽  
Shape Factor ◽  
Liquid Droplet ◽  
Pressure Rise ◽  
Propagation Speed ◽  
Spherical Shape ◽  
Water Hammer ◽  
Droplet Impact ◽  
Maximum Pressure ◽  
The Impact

The prime objective of this study is to answer the question: How large is the pressure developed at the instant of a spherical liquid droplet impact on a solid surface? Engel first proposed that the maximum pressure rise generated by a spherical liquid droplet impact on a solid surface is different from the one-dimensional water-hammer pressure by a spherical shape factor (Engel 1955 J. Res. Natl Bur. Stand. 55 (5), 281–298). Many researchers have since proposed various factors to accurately predict the maximum pressure rise. We numerically found that the maximum pressure rise can be predicted by the combination of water-hammer theory and the shock relation; then, we analytically extended Engel’s elastic impact model, by realizing that the progression speed of the contact between the gas–liquid interface and the solid surface is much faster than the compression wavefront propagation speed at the instant of the impact. We successfully correct Engel’s theory so that it can accurately provide the maximum pressure rise at the instant of impact between a spherical liquid droplet and solid surface, that is, no shape factor appears in the theory.

scholarly journals Droplet impact dynamics on micropillared hydrophobic surfaces

2016 ◽  
Vol 74 ◽  
pp. 195-206 ◽  
Author(s):  
Nagesh D. Patil ◽  
Rajneesh Bhardwaj ◽  
Atul Sharma
Keyword(s):  
Droplet Impact ◽  
Impact Dynamics ◽  
Hydrophobic Surfaces

Depth Profiling of Polystyrene Using Charged Water Droplet Impact

2009 ◽  
Vol 15 (3) ◽  
pp. 283-286 ◽  
Author(s):  
Yuji Sakai ◽  
Yoshitoki Iijima ◽  
Riou Takaishi ◽  
Daiki Asakawa ◽  
Kenzo Hiraoka
Keyword(s):  
Water Droplet ◽  
Depth Profiling ◽  
Droplet Impact ◽  
Charged Water
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