Comparing cleaning effects of gas and vapor bubbles in ultrasonic fields

Abstract

Highlights The cleaning effects of gas and vapor bubbles in ultrasound fields are compared. The cleaning effect is assessed in terms of adhesion strength and wettability. The substrates advantageously cleaned with gas or vapor bubbles are identified.

Influence of rigid wall on the nonlinear pulsation of nearby bubble

“…When the bubbles collapse, high temperature is generated in them and enormous energy is released to the surrounding liquid [5] . Cavitation has been widely used in all kinds of fields, such as sonochemistry [6] , [7] , [8] , cleaning [9] , [10] , emulsification [11] and so on. If the amplitude of driving pressure is high enough, nonlinear pulsation of bubble will emerge [12] , [13] .…”

Root canal irrigation system using remotely generated high-power ultrasound

“…Ultrasonic cleaning has been used in various engineering fields, such as semiconductor manufacturing [33] , [34] , [35] , [36] , and the mechanisms have been extensively investigated. In an ultrasonic field with sufficient acoustic pressure, cavitation bubbles can be generated by stretching of the liquid during the rarefaction phase of sound waves [37] , [38] . A cavitation bubble will exhibit dynamic motion in response to the acoustic waves, and this induces microscale flows around the bubble, including vortical flows and high-speed jets, which are responsible for the ultrasonic cleaning effect [39] , [40] , [41] , [42] .…”

Study of the efficiency of cavitation generating head with water removal system used to remove foulants from metal surface

“…Its origins date back to the 1950 s and it was beginning to become established around 45 years ago [5,6]. Ultrasonic cleaning is widely employed in various manufacturing and maintenance processes, including optical surface cleaning, semiconductor manufacturing and machinery maintenance [7]. Currently, ultrasonic cleaning is becoming more and more widespread for the cleaning of dental and medical instruments [5,6].…”

“…When pressure along the trajectory of bubbles returns to a high value, medium implosions occur, which result in shock waves and high-pressure pulses [12]. Dynamic motion of formed bubbles in response to acoustic waves creates forces, which remove fouling adhered to surface and produce cleaning effect [7,13]. Scientists assign removal effects to different dynamic actions of cavitation bubbles, for instance, microstreaming caused by pulsating bubbles, high-speed jets and shock waves upon bubble collapse and interfacial collisions of moving bubbles [7].…”

“…Dynamic motion of formed bubbles in response to acoustic waves creates forces, which remove fouling adhered to surface and produce cleaning effect [7,13]. Scientists assign removal effects to different dynamic actions of cavitation bubbles, for instance, microstreaming caused by pulsating bubbles, high-speed jets and shock waves upon bubble collapse and interfacial collisions of moving bubbles [7]. Conventionally, ultrasonic baths are used to clean individual components by generating cavitation bubbles that implode on the surface being cleaned [4].…”