Water entry dynamics of spheres with heterogeneous wetting properties

Watson, Daren A.; Bom, Joshua; Weinberg, Madison P.; Souchik, Christopher J.; Dickerson, Andrew K.

doi:10.1103/physrevfluids.6.044003

Cited by 20 publications

(4 citation statements)

References 55 publications

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“…Hurd et al studied the water entry characteristics of deformable elastomeric spheres, finding that the oscillations of these spheres during impact results in new types of nested cavities [14]. Watson et al examined spheres with heterogeneous wetting properties, finding that spheres which are partly hydrophilic and partly hydrophobic always have asymmetric cavities and drift away from straight-line trajectories [15]. Marston et al observed cavity formation for heated sphere impacts, finding that there is an inverted Leidenfrost effect when the sphere temperature is much larger than the boiling point of the liquid, which either produces a cavity with smooth walls or a double cavity structure [16].…”

Section: Introductionmentioning

confidence: 99%

Effect of ambient gas on cavity formation for sphere impacts on liquids

et al. 2022

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Section: Introductionmentioning

confidence: 99%

Effect of ambient gas on cavity formation for sphere impacts on liquids

et al. 2022

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“…2019 b ; Watson et al. 2021). Increased hydrophobicity has also been shown to increase the force of impact on a sphere throughout the cavity-forming phase (Truscott, Epps & Techet 2012), though the effect is predominantly isolated to larger depths than focused on in the present work.…”

Section: Resultsmentioning

confidence: 99%

“…The impactor speed is plotted directly against time for these experimental cases in Appendix B. The splash and cavity formation for the flexible impactor, as seen in figure 2(b) or Supplementary movie 3, are similar to the rigid case during the slamming phase, though the cases with the 3-D printed noses sometimes feature larger splashes and enhanced cavity size, likely due to the higher surface roughness and lower wettability compared with the machined aluminium noses (Duez et al 2007;Aristoff & Bush 2009;Speirs et al 2019b;Watson et al 2021). Increased hydrophobicity has also been shown to increase the force of impact on a sphere throughout the cavity-forming phase (Truscott, Epps & Techet 2012), though the effect is predominantly isolated to larger depths than focused on in the present work.…”

Section: Peak Deceleration Of the Flexible Impactormentioning

confidence: 97%

Slamming forces during water entry of a simple harmonic oscillator

Antolik,

Belden,

Speirs

et al. 2023

J. Fluid Mech.

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When a blunt body impacts an air–water interface, large hydrodynamic forces often arise, a phenomenon many of us have unfortunately experienced in a failed dive or ‘belly flop’. Beyond assessing risk to biological divers, an understanding and methods for remediation of such slamming forces are critical to the design of numerous engineered naval and aerospace structures. Herein we systematically investigate the role of impactor elasticity on the resultant structural loads in perhaps the simplest possible scenario: the water entry of a simple harmonic oscillator. Contrary to conventional intuition, we find that ‘softening’ the impactor does not always reduce the peak impact force, but may also increase the force as compared with a fully rigid counterpart. Through our combined experimental and theoretical investigation, we demonstrate that the transition from force reduction to force amplification is delineated by a critical ‘hydroelastic’ factor that relates the hydrodynamic and elastic time scales of the problem.

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“…Recently, many studies considering the effect of surface characteristics have been carried out [9][10][11]. Jia et al [12] examined the influence of surface wettability on the supercavitation process and found that, under the same conditions, the supercavitation size around a hydrophobic surface was significantly bigger than that around a hydrophilic surface.…”

Section: Introductionmentioning

confidence: 99%

Research of the Influence of Lateral Inflow Angles on the Cavitation Flow and Movement Characteristics of Underwater Moving Objects

Xie,

Jia,

Chen

et al. 2024

Processes

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This study examined the multi-phase flow field for a single object and two parallel/series objects under different incoming angles of lateral flow. The volume of fluid model, the Sauer–Schnerr cavitation model, and the six degrees of freedom (DOF) method were adopted to consider simulations of multi-phase flow, phase change, and object movement, respectively. The results show that, for a single object, the degree of asymmetry in the cavity profile depends on the component (the z-component) of the lateral inflow velocity in the direction perpendicular to the initial velocity of the object. As this component increases, the asymmetry of the cavity increases. The cavity length is related to the relative axial speed between the object and the water. For parallel objects, the cavity asymmetry is determined by the superimposed influence of the z-component of the lateral incoming speed and the high-pressure zone induced by the nearby object. The object located downstream relative to the lateral flow has a stronger cavity asymmetry than that of the upstream object, and the trajectory of the downstream object is more easily deviated than that of the upstream object. For tandem objects, with the increase in the lateral incoming angle, the supercavity length increases after the rear object enters into the front cavity. With the increase in the z-component of the lateral flow velocity, the deviation speed increases.

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Water entry dynamics of spheres with heterogeneous wetting properties

Cited by 20 publications

References 55 publications

Effect of ambient gas on cavity formation for sphere impacts on liquids

Effect of ambient gas on cavity formation for sphere impacts on liquids

Slamming forces during water entry of a simple harmonic oscillator

Research of the Influence of Lateral Inflow Angles on the Cavitation Flow and Movement Characteristics of Underwater Moving Objects

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