Modeling the dynamics of single-bubble sonoluminescence

Abstract

Sonoluminescence (SL) is the phenomenon in which acoustic energy is (partially) transformed into light. It may occur by means of many or just one bubble of gas inside a liquid medium, giving rise to the terms multi-bubble-and single-bubble sonoluminescence (MBSL and SBSL). In the last years some models have been proposed to explain this phenomenon, but there is still no complete theory for the light emission mechanism (especially in the case of SBSL). In this work, we will not address this more complicated particular issue, but only present a simple model describing the dynamical behaviour of the sonoluminescent bubble, in the SBSL case. Using simple numerical techniques within the software Matlab, we discuss solutions considering various possibilities for some of the parameters involved: liquid compressibility, superficial tension, viscosity, and type of gas. The model may be used as an introductory study of sonoluminescence in physics courses at undergraduate or graduate levels, as well as a quite clarifying example of a physical system exhibiting large nonlinearity. ‡

Modelling lipid-coated microbubbles in focused ultrasound applications at subresonance frequencies

“…However, given the very short time spans of less than 500 ps over which these extreme pressure amplitudes typically occur, as observed in Figure 14b where the shown time interval corresponds to 877 ps, we conjecture that the thermodynamic system is unable to establish a thermodynamic equilibrium. Studies on the modelling of sonoluminescence, where similarly large pressure values and bubble wall velocities are observed, corroborate the overall applicability of the modelling assumptions used in this study to predict the bubble dynamics (Vignoli et al, 2013;Nazari-Mahroo et al, 2018).…”

Effect of cavitation bubble on the dispersion of magnetorheological polishing fluid under ultrasonic preparation

“…It also indicates that the cavitation bubble is less compressed, and the impact velocity released by bubble collapse is significantly weaker when solid particles are added to the base solution. Research has found that the bubble can generate the micro-jet near a rigid interface, where the bubble collapse velocity is greater than the sound velocity of the fluid [35] . Because the bubble collapse velocity of work is one order of magnitude higher than the sound velocity of the MRPF( c ≈ 1481 m/s), the micro-jet near the solid particles can be produced.…”

Dynamic Characteristics and Wall Effects of Bubble Bursting in Gas-Liquid-Solid Three-Phase Particle Flow

“…The variation mechanism of the bubble surface is the most important part for studying the dynamic characteristic of the bubble in a three-phase flow, so the solving method of the bubble radial will be quite important. To track the time evolution of the bubble radius, the bubble radial differential equation, considering the influence of the bubble surface tension, saturated vapor pressure, constant bubble mass and liquid viscosity [48], can be obtained (Equation (10)) based on the RP equation [10,14].…”

“…The results indicated that the ultrasonic wave with the frequency of 3.24 Mhz can make the bubble with a maximum radius of 150 µm produce 80-130 m/s micro-jet. Vignoli [14] showed that a high-speed micro-jet will appear only when the bubble collapse speed is higher than the propagation sound velocity in liquid. Li J [15] conducted the VOF to simulate the cavitation collapsing near the wall and to calculate the influence of the distance between the cavitation collapse and the wall on the jet strength.…”