Measurements pf the diameter of rising gas bubbles by means of the ultrasound transit time technique

This study presents ultrasound transit time technique (UTTT) measurements of single Ar bubbles rising in Galinstan under an applied magnetic field. Two setups were used to analyze the bubble rise, which led to different bubble trajectories. UTTT was able to visualize the bubble trajectory and to measure the bubble diameters. Due to the straightening of the bubble trajectories with increasing magnetic field, variation of the apparent bubble diameter were detected.