Abstract
The dynamics of an impact pressure pulse and the evolution of the coalescence bridge between a drop and the surface of water are investigated in experiments on the impact of the drop on water surface in the range of low impact velocities U. Experimental sequences of radii r i of the bridge, which are approximated by a function of the form t1/2, are extrapolated to the instant of contact and are compared with radii r k of the outer contour of the cross section formed by the bottom part of the drop with the surface. The impact pressure pulse exhibits the critical dependence on ratio \({\varepsilon _{\text{i}}}(U) = {\dot r_i}/{\dot r_k}\) of the velocities of spreading. The value of ε = 1 determines the velocity threshold below (above) which the pressure is hydrodynamic (hydroacoustic) by nature.
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Original Russian Text © V.E. Prokhorov, 2018, published in Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2018, Vol. 153, No. 4, pp. 576–581.
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Prokhorov, V.E. Influence of Molecular Effects on the Emission of Sound in a Low-Velocity Impact of a Drop on Water Surface. J. Exp. Theor. Phys. 126, 479–484 (2018). https://doi.org/10.1134/S1063776118030184
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DOI: https://doi.org/10.1134/S1063776118030184