On the Leidenfrost effect of water droplet impacting on superalloy plate surface

The present research experimentally investigated the effect of different water droplet size on the burning behavior and extinction condition of concentric jet premixed and diffusion flame. Water droplet stream in line with flowing air from lower duct. The burning behavior of concentric jet flame was observed and the extinction of flame was gained by decreasing the flow rate of fuel until the flame exthinguised. The results showed that the burning behavior of concentric jet diffusion and premixed flame had the same tendency. Different water droplet size influenced the burning behavior of flame. Decreasing the water droplet size, luminosity of the flame became thin as well as reducing the flame height. However, the inhibition effect of water droplet was stronger for diffusion flame compared to premixed flame. For smaller water droplet size, water droplet was four times more effective for suppressing the diffusion flame than premixed flame

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Effect of water droplet breakup on hydrogen/air detonations

10.2218/iclass.2021.5924 ◽

2021 ◽

Vol 1 (1) ◽

Author(s):

Yong Xu ◽

Majie Zhao ◽

Huangwei Zhang

Keyword(s):

Water Droplet ◽

Droplet Breakup ◽

Effect Of Water

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Effect of water droplet in solvent sublation

Chinese Chemical Letters ◽

10.1016/j.cclet.2008.03.010 ◽

2008 ◽

Vol 19 (5) ◽

pp. 623-626 ◽

Cited By ~ 3

Author(s):

Peng Yu Bi ◽

Hui Ru Dong ◽

Nan Nan Wang

Keyword(s):

Water Droplet ◽

Effect Of Water

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Droplet Rolling and Spinning in V-Shaped Hydrophobic Surfaces for Environmental Dust Mitigation

Molecules ◽

10.3390/molecules25133039 ◽

2020 ◽

Vol 25 (13) ◽

pp. 3039

Author(s):

Mubarak Yakubu ◽

Bekir Sami Yilbas ◽

Abba A. Abubakr ◽

Hussain Al-Qahtani

Keyword(s):

3D Printing ◽

Water Droplet ◽

High Speed ◽

Recording System ◽

Functionalized Silica ◽

Plate Surface ◽

Hydrophobic Surfaces ◽

Droplet Motion ◽

Rolling Velocity ◽

Solution Crystallization

The motion of a water droplet in a hydrophobic wedge fixture was examined to assess droplet rolling and spinning for improved dust mitigation from surfaces. A wedge fixture composed of two inclined hydrophobic plates had different wetting states on surfaces. Droplet rolling and spinning velocities were analyzed and findings were compared with the experiments. A wedge fixture was designed and realized using a 3D printing facility and a high speed recording system was adopted to evaluate droplet motion in the wedge fixture. Polycarbonate sheets were used as plates in the fixture, and solution crystallization and functionalized silica particles coating were adopted separately on plate surfaces, which provided different wetting states on each plate surface while generating different droplet pinning forces on each hydrophobic plate surface. This arrangement also gave rise to the spinning of rolling droplets in the wedge fixture. Experiments were extended to include dust mitigation from inclined hydrophobic surfaces while incorporating spinning- and rolling droplet and rolling droplet-only cases. The findings revealed the wedge fixture arrangement resulted in spinning and rolling droplets and spinning velocity became almost 25% of the droplet rolling velocity, which agrees well with both predictions and experiments. Rolling and spinning droplet gave rise to parallel edges droplet paths on dusty hydrophobic surfaces while striations in droplet paths were observed for rolling droplet-only cases. Spinning and rolling droplets mitigated a relatively larger area of dust on inclined hydrophobic surfaces as compared to their counterparts corresponding to rolling droplet-only cases.

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