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Thermophysics and Aeromechanics

2015 year, number 4

Fluctuation emergence of bubbles under a rapid drop of pressure in a liquid

P.A. Pavlov and V.E. Vinogradov
Institute of Thermophysics UB RAS, Ekaterinburg, Russia
E-mail: vinve@mail.ru
Keywords: cavitation, extension, homogeneous nucleation, heat flux
Pages: 441–452

Abstract

Explosive cavitation at the front of a negative-pressure pulse has been studied. Conditions for the emergence of bubbles by the mechanism of homogeneous fluctuation nucleation were identified. Those conditions feature a high rate of the phase transformation, with the vapor formation process being concentrated in time at the instant of attainment of a certain pressure. Under such conditions, the liquid cavitation strength is maximal, and its value can be predicted by the homogeneous nucleation theory. For implementing the regime with high nucleation frequency, a method based on passing a negative-pressure pulse across a region with locally heated liquid was employed. The cavitation kinetics was examined by monitoring the perturbation of the heat flow from a miniature heater. The experimental data were generalized using the theory of explosive vapor formation in shock boiling mode. A method for calculating the cavitation in the regime of the fluctuation emergence of bubbles was approbated.

DOI: http://dx.doi.org/10.1134/S0869864315040058