Theoretical prediction of the yield of strong oxides under acoustic cavitation

Abstract

Considering liquid viscosity, surface tension, and liquid compressibility, the effects of dynamical behaviors of cavitation bubbles on temperature and the amount of oxides inside the bubble are numerically investigated by acoustic field, regarding water as a work medium. The effects of acoustic frequency, acoustic pressure amplitude, and driving waveforms on bubble temperature and the number of oxides inside the bubbles by rapid collapse of cavitation bubbles are analysed. The results show that the changes of acoustic frequency, acoustic pressure amplitude, and driving waveforms not only have an effect on temperature and the number of oxides inside the bubble, but also influence the degradation species of pollution, which provides guidance for improving the degradation of water pollution.

Transient simulation of cavitation evolution process in a diesel engine injector

“…It was found that eroded fuel injectors not only cause the loss of fuel injection speed, but also reduce the cavitation rate inside the nozzle. 19 Sun 20 analyzed the effect of rapid bursting of cavitation bubbles on the bubble temperature and the number of oxides in the bubble. Xu 21 studied dissolution processes of cavitation bubbles generated in vivo shock wave (SW)-induced treatments.…”

Experimental study on gas production and solution composition during the interaction of femtosecond laser pulse and liquid

“…[7] When an ultrafast laser pulse is shot in a liquid environment, the laser induces the formation of bubbles. [8][9][10][11][12] However, there are significant differences in gas generation in-duced by femtosecond laser and laser with more extended pulse width. The chemical ionization of water molecules becomes the primary inducement for the gas generation induced by femtosecond laser.…”

Theoretical estimation of sonochemical yield in bubble cluster in acoustic field*

“…Driving wave formation usually utilizes simple harmonic wave, square wave and triangle wave. [21,22] In addition, the reactor shape is also one of the factors affecting ultrasonic degradation. [23][24][25][26][27][28][29] However, in the respect of how these factors affect the quantity of strong oxidants produced such as free radicals by the acoustic cavitation, and the quantity of strong oxidants that are released into the bulk solution from the interior of bubble, researchers focused mainly on the study of single bubble cavitation.…”

“…[23][24][25][26][27][28][29] However, in the respect of how these factors affect the quantity of strong oxidants produced such as free radicals by the acoustic cavitation, and the quantity of strong oxidants that are released into the bulk solution from the interior of bubble, researchers focused mainly on the study of single bubble cavitation. [22,[30][31][32][33][34][35][36][37][38][39] In fact, cavitation bubble always exists in the form of bubble cluster, and there are thousands of microbubbles in the cluster. For the quantity of strong oxidants produced by bubble collapse, the study of a single bubble cannot replace the study of the multiple bubbles.…”