Dynamic simulation of ultrasonic cavitation bubble and analysis of its influencing factors

This paper explores physical conditions under which the best ultrasonic cavitation effect can be obtained and provides theoretical guidance for extensive applications of ultrasonic cavitation. Based on the Rayleigh-Plesset equation, we perfected bubble dynamic motion in an ultrasonic cavitation model by considering viscosity, surface tension, vapour pressure, adiabatic exponent, and acoustic radiation damping as dynamic factors. Since temperature variations influence physical properties of water, physical models of water saturation vapor pressure, surface tension, sound velocity and viscosity with temperature changing were also built. Thus, influences of ultrasonic frequency, acoustic pressure amplitude, initial bubble radius, bulk solution temperature, and adiabatic index on the evolution process of an ultrasonic cavitation bubble are discussed accordingly. The simulation results indicate that the cavitation effect decreases as ultrasonic frequency increases. With an increase of ultrasonic sound pressure, th