307 / 2024-03-15 10:48:04

Effect of restricted space on rising characteristics of a single bubble

flotation,restricted space,rising velocity

6、能源资源清洁加工与转化利用 > 1、矿物加工基础理论

Air bubbles are the carriers of mineral separation in the flotation process, and their motion characteristics have critical effects on flotation. However, the motion characteristics of bubbles in pressurized restricted space are still unclear. In this study, a bubble rising observation system in restricted space was built, and based on the high-speed dynamic visualization technique, the bubble characteristics and rising characteristics under different fluid flow rates and pressures in restricted space under flow environment were investigated, and it was found that with the increase of the flow rate, the bubble rising speed increased significantly; and under the pressurized environment, the bubble rising speed decreased compared with that in the unpressurized environment, and at the same time, it showed increased velocity fluctuations and displacement variations. It was analyzed that such variations were due to the pressure acting on the bubbles from the upper side, which affected the force equilibrium of the bubbles. In addition, the force analysis of bubbles in restricted space was carried out and the force equilibrium equations of bubbles in restricted space were derived. This study will contribute to the understanding of the bubble motion mechanism in the flotation-restricted space.