Air Bubble Entrainment, Breakup, and Interplay in Vertical Plunging Jets

作者：Bertola Numa; Wang Hang^*; Chanson Hubert

来源：Journal of Fluids Engineering-Transactions of the ASME, 2018, 140(9): 091301.

DOI：10.1115/1.4039715

The entrainment, breakup, and interplay of air bubbles were observed in a vertical, two-dimensional supported jet at low impact velocities. Ultra-high-speed movies were analyzed both qualitatively and quantitatively. The onset velocity of bubble entrainment was between 0.9 and 1.1 m/s. Most bubbles were entrained as detached bubbles from elongated air cavities at the impingement point. Explosion, stretching, and dejection mechanisms were observed for individual bubble breakup, and the bubble interaction behaviors encompassed bubble rebound, "kiss-and-go," coalescence and breakup induced by approaching bubble(s). The effects of jet impact velocity on the bubble behaviors were investigated for impact velocities from 1.0 to 1.36 m/s, in the presence of a shear flow environment.

• 出版日期2018-9