Interaction of two oscillating sonoluminescence bubbles in sulfuric acid

Abstract

The mutual interaction of two oscillating gas bubbles in different concentrations of sulfuric acid is numerically investigated. A nonlinear oscillation for spherical symmetric bubbles with equilibrium radii smaller than 10 μm at a frequency of 37 kHz in a strong driving acoustical field P(a)=1.8 bar is assumed. The calculations are based on the investigation of the secondary Bjerknes force with regard to adiabatic model for the bubble interior which appears as repulsion or attraction interaction force. In this work the influence of the various concentrations of sulfuric acid in uncoupled and coupled distances between bubbles has been investigated. It is found that the sign and value of the secondary Bjerknes force depend on the sulfuric acid viscosity and its amount would be decreased by liquid viscosity enhancement. The results show that big change in the parameters of produced bubbles occurs in the sulfuric acid with concentrations from 65% to 85%.

A parametric review of sonochemistry: Control and augmentation of sonochemical activity in aqueous solutions

“…However, the time for coalescence to occur becomes relevant in an ultrasound environment due to time dependant forces on the bubbles [36]. Numerical analysis of a two bubble system suggests that increasing the viscosity of the liquid, in this case sulfuric acid, would decrease the secondary Bjerknes force, approach velocity and therefore increase contact time [245]. For low viscosity fluids it has been calculated that bubble structural instability is increased and the bubbles' approach to one another is inhibited [237].…”

Quasiadiabatic approach for laser-induced single-bubble sonoluminescence

“…Generally, to create bubbles a sound field is applied, which normally leads to the production of multibubble sonoluminescence (MBSL) and deals with interaction of several bubbles and investigating of their dynamics [1,2]. Single-bubble sonoluminescence (SBSL) is also produced in special exerting conditions [3][4][5].…”

“…In the isothermal model some important parameters such as temperature cannot be calculated [2,13,36]. In the hydrochemical model, heat and mass transfer between bubble and environment fluid and chemical reactions are considered.…”

“…Single-bubble sonoluminescence (SBSL) is also produced in special exerting conditions [3][4][5]. Various aspects of SBSL and MBSL are studied, including intensity and spectrum of the emitted light [6][7][8] and its dependency on the ambient parameters [9,10], the dissolved gas in liquids [11], the phase diagrams [12,13], the pulse width [14,15], the conditions of bubble stability [16,17], and the modification of the initial Rayleigh-Plesset equation considering various effects of the medium such as compression viscosity of the liquids [2,5,18].…”

Influence of microparticle size on cavitation noise during ultrasonic vibration

“…Taking two bubbles as an example, R A = R B = 5 µm, the distance between the center of the two bubbles d AB = R A−max + R B−max = 192.5 µm (the smallest distance keeping the two bubbles from contacting with each other). The radical motion of two coupled bubbles could be expressed by the modified Keller-Misksis equations 23 as…”