On the impact of ultrasonic cavitation bubbles

Abstract

The main purpose of this study was to determine the impulse of a bubble on a solid surface or the amount of energy transmitted to the surface by the bubble. To do this, the results of previous numerical studies were used to derive a relationship between the speed of microjet and acoustic pressure amplitude. It was found that the speed of microjet is proportional to the logarithm of the acoustic pressure amplitude. Aluminium foil specimens were exposed to cavitation for 3 s and the dimensions of pits generated on specimens were measured. Then, the deformation energy of each pit and the corresponding impulse were calculated. The trend of experimental results was in a good agreement with the theoretical ones but their exact values were not.

Titanium‐Based Nanoarchitectures for Sonodynamic Therapy‐Involved Multimodal Treatments

“…The influence of different mechanisms of SDT is still relatively unknown but the most important mechanisms are being discussed here in this chapter. [1,[15][16][17] The mechanisms of cavitation phenomenon, [18,19] ROS, [20] and pyrolysis [21] are of the effective mechanisms frequently reported in the literature.…”

“…Cavitation is capable of improving permeability and penetrability using the impact of shock waves, promoting drug and gene delivery. [25] However, the cavitation Small 2023, 19, 2206253 parameters such as amplitude, power, frequency, and time of SDT should be carefully adjusted as the excessive treatments or improper parameters may result in unwanted outcomes. [25] When 1.0-2.0 MHz ultrasonic waves with an intensity of 0.5-3.0 W cm −2 interact with a sonosensitizer in liquid media, cavitation may initiate and activate [6] wherein the corresponding mechanical effects can be divided into two distinct states of stable cavitation and transient cavitation.…”

The Role of Dry Aero-acoustical Lubrication and Material Softening in Ultrasonically Assisted Milling of Difficult-to-Cut AISI 304 Steels

“…Ultrasonic cleaning [2], forming [3], peening [4], casting [5] are only a few common industrial applications of this kind of technology. Nowadays, ultrasonic vibration is applied as an assisting process for traditional machining operations such as turning, drilling and milling leading to highest productivity and performance in all manufacturing operations, especially for machining of those hard-to-cut materials [6][7][8][9][10].…”

Neck growth kinetics during ultrasonic-assisted sintering of copper powder

“…Ultrasonic vibration has been utilized in different types of manufacturing processes to enhance process performance and to reduce the cost of the process in terms of energy, consumption, and maintenance. 1–5 In recent years, ultrasonic vibration assistance has been explored in the powder metallurgy field for better densification. The cyclic vibrations at micron level were used in different types of powder metallurgy routes such as pressureless sintering, pressure-assisted sintering, etc.…”