ABSTRACT
The propagation of finite-amplitude or high-intensity ultrasonic waves is accompanied with a variety of effects whose intensity depends on the amplitude of vibrations. During cavitation in an ultrasonic field, many cavities appear simultaneously at distances less than the ultrasonic wavelength to form a cavitation region where relatively low-density energy of ultrasonic field transforms into high-density energy inside and near collapsing cavities. The growth of radiation resistance was induced by cavitation both near the radiator and in the melt bulk. When the crystallization front was sufficiently far from the radiator, the streamings developed in the same fashion as in the case of free liquid. If the absorption coefficient is known, one can estimate the attenuation of sound in the liquid containing gas bubbles. In the absence of an acoustic field, the vapor- or gas-filled bubble disappears due to gas diffusion into the liquid, even if it is saturated with gas.
