Identification approach of acoustic cavitation via frequency spectrum of sound pressure wave signals in numerical simulation

Real-time assessment of high-intensity focused ultrasound heating and cavitation with hybrid optoacoustic ultrasound imaging

“…This approach mainly relies on detecting hyperechoic regions in the images ascribed to cavitation and other effects [18] . Other methods for cavitation monitoring include harmonic frequency detection [19] and passive acoustic mapping methods [20] . Also, US imaging can provide temperature measurements based on local changes of speed of sound recorded via speckle tracking or other US-based speed of sound measurements [21] , [22] , [23] , [24] , [25] , [26] , [27] , [28] .…”

Ultrasound Irradiation for Upgrading Vacuum Residue: A Comprehensive Study on Its Effects on Rheological, Structural, Thermal Behavior, and Catalytic Hydrocracking Performance

“…The authors have previously studied acoustic cavitation, where the distance between molecules stretches or compresses in the propagation direction of the sound wave, generating rarefaction or concentration phases that lead to the formation or collapse of cavitation bubbles. 27 Inside the cavitation bubbles, ultrahigh temperature up to 5000 K and pressure up to 1000 atm will be reached; these microbubbles with such extreme conditions are regarded as microchemical reactors that help induce and accelerate chemical reactions. With the collapse of cavitation bubbles, local hot spots form together with the release of free radicals, further promoting chemical reactions.…”

Enhancement of Vacuum Gas Oil Viscosity Using Ultrasound

“…One of the most developing technologies is ultrasound, which is used to create the acoustic cavitation phenomena [14].High energy may be released inside a liquid by a process called acoustic cavitation, which in turn causes catalytic chemical processes and alters the fluid's characteristics, such as reducing viscosity [15].The thermal separation of vacuum gas oil's bonds and the creation of hydrogen atoms that result from ultrasonic treatment are important for improving heavy molecules Cavitation is thought to be the cause of ultrasonic irradiation [16]. The ultrasonic power supply or generator converts 50/60 Hz electricity into high-frequency electrical energy, When this voltage is applied to the acoustic energy inside the converter, it is converted into little mechanical vibrations [17].…”