68th Annual Meeting of the APS Division of Fluid Dynamics (November 22, 2015 — November 24, 2015)

V0033: water entry of sphere: splash, cavity and jet

Authors

• Zhaoxin GONG, Department of Mechanics, MOE Key Laboratory of Hydrodynamics, Shanghai Jiao Tong University, Shanghai, China
• Yao HONG, Department of Mechanics, MOE Key Laboratory of Hydrodynamics, Shanghai Jiao Tong University, Shanghai, China
• Yongliu FANG, Department of Mechanics, MOE Key Laboratory of Hydrodynamics, Shanghai Jiao Tong University, Shanghai, China
• Hua LIU, Department of Mechanics, MOE Key Laboratory of Hydrodynamics, Shanghai Jiao Tong University, Shanghai, China

DOI: https://doi.org/10.1103/APS.DFD.2015.GFM.V0033

When a sphere enters water with certain impacting velocity, the phenomena of interests are Splash, Cavity and Jet. Here, we use two high-speed cameras to record the motion of steel sphere, and present the effects of material surface property (hydrophilicity and hydrophobicity) and vacuum degree on the water entry problem. The effects are mainly embodied in the splash and cavity smoothness, and the surface seal, which are relevant to the motion stability.