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image of Experimental Investigations of Single Bubbles Rising in Ethanol-Aqueous Solutions

Abstract

Introduction

In industrial processes, some impurities in industrial liquids are usually adsorbed on the bubble interface, thus affecting the bubble interface mobility. Sometimes, additives are also intentionally added to industrial liquids to optimize the hydrodynamic properties of discrete bubbles and improve industrial efficiency. Therefore, an in-depth study of the hydrodynamics of discrete bubbles in impure liquids is of great significance. The objective of this study is to explore the dynamics of bubble rising in ethanol-aqueous solutions, with the aim of understanding the relationship between bubble rising dynamics and the ethanol mass fraction.

Method

The effect of the free-rising motion of individual bubbles was studied by controlling the ethanol mass fraction and bubble size, and images of the bubbles were recorded with the aid of a high-speed video camera when the rising motion of the bubbles reached an approximate steady state.

Results

When the equivalent diameter of the bubble was fixed, the ascending trajectories of bubbles changed from spiral lines to straight ones as the ethanol mass fraction increased. The larger the equivalent diameter of bubbles is, the higher the transitional mass fraction of the bubble ascending trajectory is. For single bubbles with the same equivalent diameter, as the ethanol mass fraction increased, the terminal ascending velocity of bubbles approximately decreased first and then increased; however, the aspect ratio of single bubbles initially increased and then decreased. There were three concentration regions corresponding to the apparent changes in the terminal ascending speed and the terminal aspect ratio of single bubbles as the ethanol mass fraction increased.

Discussion

The impact of the ethanol mass fraction on bubble rising dynamics, including the bubble equivalent diameter, terminal ascending velocity, and ascending trajectory, was thoroughly analyzed and discussed. The related mechanism of bubble dynamics was also discussed.

Conclusion

The bubble ascending dynamics were found to be related to ethanol mass fraction, and the dependence of the ascending dynamics of single bubbles on ethanol mass fraction was complex. The bubble terminal ascending speed did not change monotonically as the ethanol mass fraction increased.

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2025-10-02
2025-11-16

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Experimental Investigations of Single Bubbles Rising in Ethanol-Aqueous Solutions
Bentham Science Publishers ; https://doi.org/10.2174/0124055204397799250925071106
/content/journals/rice/10.2174/0124055204397799250925071106
/content/journals/rice/10.2174/0124055204397799250925071106
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  • Article Type:     Research Article
Keywords: velocity ; interface pollution ; Surfactants ; bubble dynamics ; impure liquids ; hydrodynamics

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