Sonocapillary effect

The authors [57] have taken the disagreement in theoretical and experimental data into account and have proposed their own hypothesis of the sonocapillary effect. They have considered the asymmetry of boundary conditions of a collapsing cavitation bubble when the spheric form of the cavity becomes unstable and the cavity deforms with formation of a cumulative liquid jet. This cumulative jet is considered [57] to be responsible for the liquid rise in the capillary. 

An appreciation of the decisive role of the hydrodynamic phenomena associated with cavitational collapse leads to a better understanding of these phenomena with respect to the sonocapillary effect. 

Irrespective of the conditions ensuring the abnormally rapid movement of a liquid in a capillary under acoustic cavitation effect, it is important to note that the sonocapillary effect follows all the major effects of the ultrasonic treatment of melts. Among such phenomena are wetting and activation of solid nonmetallic impurities in a liquid metal as well as fine filtration of a melt through porous filters under action of the ultrasonic cavitation treatment. For both processes, ultrasonic cavitation and sonocapillary effect with formation of cumulative jets provide the accelerated mass transfer of a melt to slots and cracks in the surface of nonwettable solid particles and into capillary channels of fine filters. 

China, LY216-9. By comparing the DTA and TG curves of the active charcoal regenerated with hot water washing and ultrasonic washing, the enhanced effect of the ultrasonic washing was thought to be the result of some form of sonocapillary phenomena. 

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