The effect of temperature on mass transfer of a fluid in capillaries under the action of ultrasonic cavitation. Experiment and application

The phenomenon of an anomalous increase of mass transfer of a fluid in a capillary in an ultrasonic field (ultrasonic capillary effect) with increasing fluid temperature is studied and results are presented, as well as high-speed photomicrographic pictures of cavitation bubbles at the capillary end face. The mechanism of the effect is shown to be the inception of a resulting fluid flow into the capillary due to non-spherical collapse of cavitation bubbles at the capillary end face with the formation of cumulative microjets of fluid. The results of the use of the ultrasonic capillary effect in practice to increase the sensitivity of capillary non-destructive testing are presented.