title: Self-action of ultrasonic beams for biological applications.
abstract: Theoretical and experimental investigations of powerful ultrasonic beams self-focusing in liquids are described. Calculations of the conditions to observe self-action as a result of sound-induced heating of liquids are reported. The effects of controlled self-action of ultrasonic waves in high-viscosity liquids are demonstrated in experiments. A hydrodynamic mechanism of the acoustic dispersion technique is developed. The rate of this process, as a function of ultrasound intensity, including the effects of self-focusing and self-transparency, is evaluated.
mesh_terms: D000042:Absorption; D000162:Acoustics; D001554:Benzene / Q000737:chemistry; D001709:Biotechnology; D006358:Hot Temperature; D006801:Humans; D007834:Lasers; D008567:Membranes, Artificial; D008956:Models, Chemical; D008962:Models, Theoretical; D012212:Rheology; D012996:Solutions / Q000737:chemistry; D013816:Thermodynamics; D014465:Ultrasonics; D014783:Viscosity