Experimental investigation of bubble breakup in bubble chains rising in a liquid metal

The process of bubble breakup in a liquid metal was studied by X-ray radiography and high-speed video imaging. Argon gas bubbles were injected through a single orifice at the bottom of a rectangular vessel filled with the eutectic GaInSn alloy. Moderate gas flow rates were applied at isothermal conditions resulting in the formation of bubble chains. The bubble breakup events observed in the chosen experimental geometry were mainly initiated by bubble collisions or by the effect of local shear flow. We present experimental results accompanied by statistical analysis of the bubble breakup frequency, number of daughter bubbles and their size distribution, bubble velocities before and after the breakup process for a broad range of Argon gas flow rates. (C) 2019 Elsevier Ltd. All rights reserved.