Experimental Investigation on Characteristic of Single Bubble Motion in Stagnant Water

The bubble motion characteristic is one of the most important fields in two-phase flow research. Based on the image recognition method, the characteristic and dynamics of single bubble rising process in stagnant water were analyzed. The trajectory, deformation extent and instantaneous terminal velocity of single bubble rising process with different equivalent volume diameters were analyzed. The research results show that the peak value of lateral oscillation amplitude is proportional to the peak value of lateral velocity. The instantaneous aspect ratio is inversely proportional to instantaneous axial velocity. The phenomenon that the lateral motion position, aspect ratio and rising speed of a single bubble has periodical change. Based on the quantitative analysis of the relationship between bubble terminal velocity and bubble equivalent volume diameter, the existing prediction formulas were compared and evaluated. A more accurate explicit terminal velocity correlation based on experimental data was obtained.