Experimental investigation on bubble coalescence regimes under non-uniform electric field
| Autor: | Piyaphong Yongphet, Kai Yu, Dongbao Wang, Bin Li, Wei Zhang, Haojie Xu, Jiang Yao, Junfeng Wang |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Coalescence (physics)
Materials science General Chemical Engineering Bubble Direct current 02 engineering and technology General Chemistry Mechanics Wake 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Industrial and Manufacturing Engineering 0104 chemical sciences Physics::Fluid Dynamics Electric field Environmental Chemistry Weber number Bubble coalescence Bond number 0210 nano-technology |
| Zdroj: | Chemical Engineering Journal. 417:127982 |
| ISSN: | 1385-8947 |
| DOI: | 10.1016/j.cej.2020.127982 |
| Popis: | In this study, the characteristics of interactions between bubbles in ethanol were examined using a needle-ring electrode rig in the presence of a direct current electric field, using high-speed photography and with a focus on the effect of the electric field strength on the bubble coalescence. The results show bubble coalescence associated with four regimes in the manipulated parameter regions-namely, the coalescence of growing bubbles, single coalescence of rising bubbles, secondary coalescence of rising bubbles, and multiple coalescences of bubbles. The bubble interaction dynamics-which are characterized by the bubble trajectories, height positions, inclination angles, and bubble sizes-show that the bubble approach, collision, and coalescence in the electric field proceed in ways different from those reported in the literature. Furthermore, the cross-sectional average bubble diameter values corresponded to the bubble coalescence regimes. In addition, the increase in the Weber number (We) and electrical Bond number (BoE) gives rise to the bubble coalescence frequency. The We works to strengthen the wake induction, while the BoE works to accelerate the generation of smaller bubbles. |
| Databáze: | OpenAIRE |
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