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- W595952012 abstract "Ultimate Cavity Dynamics of Hydrophobic Spheres Impacting on Free Water Surfaces Mohammad Mujtaba Mansoor Cavity formation resulting from the water-entry of solid objects has been the subject of extensive research owing to its practical relevance in naval, military, industrial, sports and biological applications. The cavity formed by an impacting hydrophobic sphere normally seals at two places, one below (deep seal) and the other above the water surface (surface seal). For Froude numbers , the air flow into the resulting cavity is strong enough to suck the splash crown above the surface and disrupt the cavity dynamics before it deep seals. In this research work we eliminate surface seals by means of a novel practice of using cone splash-guards and examine the undisturbed transient cavity dynamics by impact of hydrophobic spheres for Froude numbers ranging . This enabled the measurement of extremely accurate pinch-off heights, pinch-off times, radial cavity collapse rates, and jet speeds in an extended range of Froude numbers compared to the previous work of Duclaux et al. (2007). Results in the extended regime were in remarkable agreement with the theoretical prediction of scaled pinch-off depth, and experimentally derived pinch-off time for . Furthermore, we investigated the influence of confinement on cavity formation by varying the cross-sectional area of the tank of liquid. In conjunction with surface seal elimination we observed the formation of multiple pinch-off points where a maximum of four deep seals were obtained in a sequential order for the Froude number range investigated. The presence of an elongated cavity beneath the first pinch-off point" @default.
- W595952012 created "2016-06-24" @default.
- W595952012 creator A5085413494 @default.
- W595952012 date "2012-12-01" @default.
- W595952012 modified "2023-09-27" @default.
- W595952012 title "Ultimate Cavity Dynamics of Hydrophobic Spheres Impacting on Free Water Surfaces" @default.
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- W595952012 doi "https://doi.org/10.25781/kaust-0c9jc" @default.
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