Abstract
In this study, the effect of the impact velocity of a droplet on the time-dependent force exerted on the droplet and droplet pressure during high-speed [O (100 m/s)] liquid droplet impingement (LDI) on a planar rigid wall is numerically investigated. The force exerted on the droplet and droplet pressures are computed as a function of time, and its frequency spectrum is analyzed to explain the physical mechanisms that occur during high-speed LDI. The results show that high-speed LDI involves the formation of a water hammer shock and its reflection on the free surface of the droplet and wall, resulting in sustained reverberation inside the droplet. Therefore, the force curve shows oscillatory behavior and is quite different from that of the low-speed [O (1 m/s)] impact case. Finally, the force and the droplet pressure are computed for various impact velocities of the droplet.
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