Effect of wettability on the water entry problem of aluminum spheres

Kim, Seolha; Kim, Dongseob; Kim, Hyungmo

doi:10.1007/s12206-020-0224-2

Cited by 3 publications

(2 citation statements)

References 19 publications

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“…To answer these questions, we focused in detail on the climbing mechanism of the liquid film after the sphere impacted the free liquid surface. 23 It should be noted that a typical feature of the solid–liquid impact process is that a liquid film is generated at the solid–liquid interface after impacting, then the generated liquid film climbs up the sphere surface. However, two different types of phenomena can occur during the liquid film climbing process (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…(2) The preparation of microstructured spherical surfaces is very complicated in recent works. For example, the laser etching method requires a lot of wasted time, 23 so it is urgent to find a more suitable and efficient method for the preparation of large-area microstructures on spherical surfaces. (3) To the best of our knowledge, few studies have concentrated on the stability and applicability of microstructure-induced air cavities, so its application potential in various fields has not yet been reached.…”

Section: Introductionmentioning

confidence: 99%

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Dramatically reducing the critical velocity of air cavity generation via biomimetic microstructure effects

Wang

Liu

et al. 2022

Nanoscale

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dramatically reducing the critical velocity of air cavity generation via biomimetic microstructure effects

Wang

Liu

et al. 2022

Nanoscale

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Experimental investigations on the oblique water entry of hollow cylinders

et al. 2022

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Influence of superhydrophobic area occupancy and impact angle on the water entry dynamics of spheres

Tao

Wang

et al. 2022

Physics of Fluids

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In this work we reported a kind of deflecting air cavity generation strategy through controlling the superhydrophobic (SHB) area occupancy and the impact angle of water entry. The influence of SHB area occupancy and impact angle on the water entry dynamics and drag reduction characteristics of spheres are also explored through both experimental and theoretical analysis. For a hemispherically-coated sphere, it is found that the formed air cavity would reach a maximum deflecting angle when the impact angle of water entry is 90º. With the increasing impact angle, the deflection displacement of hemispherically-coated sphere in the horizontal direction first increases and then decreases. When the impact angle is 90{degree sign}, the deflection displacement reaches the maximum. The deflection displacement of SHB region-modulated sphere in the horizontal direction has the same variation trend. Moreover, the SHB region-modulated sphere exhibits different air cavity morphologies (no cavity, transition state seal, deep seal, surface seal) at different impact velocities for impact angles of 0{degree sign} and 180{degree sign}. The air cavity pinch-off depth and pinch-off time first increase and then stabilize as the SHB area occupancy increases, regardless of whether the impact angle is 0{degree sign} or 180{degree sign}, and the value of (Zpinch-Zp)/Zpinch is not affected by the SHB area occupancy (α ~ 0{degree sign}). Finally, we demonstrate that SHB region-modulated sphere all move faster than the original spheres, and the sphere with a SHB area occupancy of 0.25 (α ~ 180{degree sign}) is able to reduce the drag reduction coefficient to 0.055.

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Effect of wettability on the water entry problem of aluminum spheres

Cited by 3 publications

References 19 publications

Dramatically reducing the critical velocity of air cavity generation via biomimetic microstructure effects

Dramatically reducing the critical velocity of air cavity generation via biomimetic microstructure effects

Experimental investigations on the oblique water entry of hollow cylinders

Influence of superhydrophobic area occupancy and impact angle on the water entry dynamics of spheres

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