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Fast Superfine Components and Sound Packets in Phenomena Induced by the impact of a Drop on a Target Fluid in Quiescent Conditions

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Fluid Dynamics & Materials Processing 2020年第4期16卷 773-800页

作者： Yuli D.Chashechkin Ishlinsky Institute for Problems in Mechanics RAS Moscow119526Russia

The structure of the flow and the acoustic signals generated by the impact of a freely falling drop of water with an underlying quiescent fluid have been investigated for droplets having diameter 0.5 cm and a contact velocity in the range 1.5flow(as seen from above and from the side).The evolution of ejecta,spikes,droplets spray,cavity,splash,secondary cavity,streamer,secondary droplets and sequence of capillary waves is reported *** particular,perturbations of the smoothed free surface with transverse dimensions from 0.03 cm to 0.15 cm have been observed in the center of the cavity and at the head of a growing *** total duration of the fine structure’s existence has been found to range from 30 to 50 *** acoustic packets have been recorded by means of a measuring hydrophone and a sensitive *** acoustic signals have revealed a high-frequency pulse associated with the primary contact and a delayed main lower-frequency packet(with a time shift ranging between 50 ms and 210 ms).The content of the acoustic signals indicates that from a large number of observed gas bubbles,only one was actually *** such a case(the formation of the bubble resulting from the break of a thin air bridge),the shock generated by the fast-moving remnant of the bridge produces volumetric oscillations of the *** sound stops as soon as the bubble takes a smooth elliptical or spherical *** details are reported about the relationship between the generation of capillary and acoustic waves and the features of hydrodynamic flows relating to the cavity,or the formation of a splash and the flows caused by the interaction of secondary drops with the perturbed surface of the target *** formation of fine flows components is associated with the release of available potential energy and the conservation of perturbations in a thin“double layer”located in

关键词： Liquid drop impact fine flow waves sound energy

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