On the nonlinear acoustic characteristics of a crystallizing liquids

Results of theoretical researches of nonlinear propagation of a sound in the crystallizing liquid containing the crystallization centers are presented. The abnormal behaviour of frequency and concentration dependences of the parameter of the acoustic nonlinearity, essentially differing on the character from those in case of a liquid with particles without phase transformations is revealed. It is shown, that phase transformations make strong influence on dynamics of the crystallization centers with the sizes, characteristic for experiments with crystallizing liquids in porous environments in which anomalies in behaviour of absorption and a dispersion of sound speed have been earlier experimentally established at crystallization and melting. It is shown, that feature of the parameter of acoustic nonlinearity in crystallizing water at monodisperse crystallization centers is sharp nonlinearity increase at the small sizes from ten to hundred nanometers. It is noticed, that the important feature is the failure at the sizes in some hundreds nanometers when compressibility of crystallization center owing to phase transformations become negative. Nevertheless, as a whole phase transformations increase acoustic nonlinearity of crystallizing liquids. It is revealed, that the most considerable influence of phase transformations is observed on rather low frequencies and at the small sizes of the crystallization centers.