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Evolution of the Structure of Acoustic Signals Caused by the Impact of a Falling Drop on a Liquid
Acoustical Physics ( IF 0.9 ) Pub Date : 2020-07-27 , DOI: 10.1134/s1063771020040016 Yu. D. Chashechkin , V. E. Prokhorov
中文翻译:
液滴下落对液体的影响引起的声音信号结构的演变
更新日期:2020-07-27
Acoustical Physics ( IF 0.9 ) Pub Date : 2020-07-27 , DOI: 10.1134/s1063771020040016 Yu. D. Chashechkin , V. E. Prokhorov
Abstract
Combined high-resolution optic and acoustic methods are used for the first time to synchronously detect the fine structure of processes initiated by submersion of a freely falling water drop in a tank with degassed liquid. The emphasis is on analyzing the evolution of the fine structure of flow pattern, the accompanying capillary waves, and the amplitude–frequency characteristics of sound packets. The sequence of acoustic signals includes a shock pulse, which is caused by the initial contact of the drop with the surface of the liquid at rest, and a series of consecutive sound packets. The shock pulse being reliably reproduced in experiments has a complex structure, which includes short segments of high-frequency oscillations and longer segments of low-frequency oscillations. The number of emitted sound packets and their parameters vary in an arbitrary way from one experiment to another while the size of drop and the distance of fall remain invariable. A series of experiments reveals cases of single and secondary packet emission with different spectral compositions of packets, as well as cases of their total absence. Analysis of data is performed with allowance for the effect of the “double layer”, which replaces the coalescence surface of liquids and retains the disturbances caused by transformation of available potential surface energy to other forms, such as thermal energy, pressure disturbance, and energy of fine currents actively affecting the gas cavities.中文翻译:
液滴下落对液体的影响引起的声音信号结构的演变