Bubble Dynamics Under Forced Oscillation in Microgravity Environment

Abstract

Two-dimensional numerical simulation of bubble dynamics in microgravity is performed employing a Volume of Fluid (VOF) solver. Shape oscillation and deformation of bubbles under forced vibration are studied. Coupling between the oscillatory translational motion and shape deformation results in nonlinear behavior of bubbles at high amplitudes and frequencies. As a result of oscillation of the buoyancy force, the pressure field around the bubbles oscillates and bubbles interact with each other. Effect of vibration frequency and amplitude and liquid to gas density ratio on the shape of bubbles and bubble-bubble interaction is studied. It is shown that the shape of the bubbles in response to the forced vibrations mainly depends on the acceleration of the vibration.

Thermocapillary Bubble Oscillations and Migration in a Vibrating Cylinder in a Zero-Gravity Environment

“…The second oscillation begins with different velocity and shape than the rst oscillation and the same thing behavior can be observed for the other oscillations. Additionally similar dynamics have been observed for high frequencies and amplitudes by Movassat et al (2009). Compared to the frequency variation effects, the amplitude in uences considerably not only the bubble trajectory but also the arrival time at the top.…”

“…6b and 6c). Those pulsations deform the bubble shape from its initial circular shape as observed by Movassat et al (2009). Therefore, the shape change affects the bubble motion.…”

“…This complicated phenomenon intrigued many researchers and became a very focused topic. Movassat et al (2009) studied numerically the interaction of two bubbles in a square vibrating container using the VOF solver. Their results showed that bubble collision occurs faster when the vibration frequency and amplitude are important.…”