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- W4224884403 abstract "Bubble instantaneous hydrodynamics including bubble trajectory, bubble shape and rising velocity is investigated for a single bubble rising in quiescent water. To analyze unregular shape oscillation, a new criterion, namely bubble deformation factor is calculated by three-dimensional normalized bubble interfacial area. Regarding long-term bubble hydrodynamics, a moving reference frame is applied. The relationship between bubble shape and rising velocity is discussed, and the impact of surface tension on bubble hydrodynamics is illustrated. The accuracy of simulation results is validated based on the experimental data, while the feasibility of the present method is verified by comparing it to the theoretical correlation. The results show that the introduction of bubble deformation factor standing for shape oscillation is feasible and bubble shape oscillation is sensitive to bubble motion pattern. In the presence of straight trajectory, the local minima of bubble deformation factor are associated with the local rising velocity maxima and vice versa. In terms of zigzag or helical trajectory, the velocity-shape dependence is under the influence of bubble horizontal motion. As for the damped shape oscillation, the oscillation dynamics of bubble deformation factor and rising velocity are highly sensitive to the variation in Eötvös number. In the quasi-stable stage, the increasing Eötvös number leads to a slight increase in terminal bubble deformation factor and a significant decrease in terminal velocity." @default.
- W4224884403 created "2022-04-27" @default.
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- W4224884403 date "2022-09-01" @default.
- W4224884403 modified "2023-09-24" @default.
- W4224884403 title "CFD simulation of instantaneous shape oscillation with rising velocity fluctuation for single bubble rising in water" @default.
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- W4224884403 doi "https://doi.org/10.1016/j.anucene.2022.109153" @default.
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