期刊
MINERALS
卷 13, 期 9, 页码 -出版社
MDPI
DOI: 10.3390/min13091130
关键词
bubble motion; bubble terminal velocity; bubble local velocity; dynamic adsorption layer; stagnant cap
This narrative review focuses on the motion of bubbles in flotation process, discussing their behavior and shape deformation in different systems. Monitoring bubble motion provides valuable information about the state of the gas-liquid interface.
In flotation, a bubble acts as a carrier for attached particles. The properties of the gas-liquid interface of the bubble are one of the main factors determining the bubble motion and flotation efficiency. Monitoring of the bubble motion may deliver interesting information about the state of the gas-liquid interface. In the case of pure liquids, a bubble surface is fully mobile, while the presence of surface-active substances (e.g., surfactants) causes diminishing bubble velocity due to the retardation of the interface fluidity. The theoretical prediction of the terminal velocity value for the bubble has been investigated for over a century, delivering a number of various models describing bubble motion in a liquid. This narrative review is devoted to the motion of the bubble in stagnant liquids and is divided into three main sections describing: (i) experimental techniques for tracking bubble motion, (ii) bubble motion and shape deformation in clean water, and (iii) bubble motion in solutions of surface-active substances.
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