Effects of translational motion on the Bjerknes forces of bubbles activated by strong acoustic waves

Zhang, Xianmei; Fan, None Li; Wang, Chenghui; Mo, Runyang; Hu, Jing; Guo, Jianzhong; Lin, Shuyu

doi:10.1016/j.ultras.2022.106809

Cited by 14 publications

(8 citation statements)

References 39 publications

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“…The major modification took place in R CT , the charge-transfer resistance, and C dl , the double-layer capacitance, where the former reduced by a factor of 7, while the latter downscaled by 3 orders of magnitude compared to the corresponding initial values for the W0 sample. There are two effects responsible for these tremendous reductions in resistance and double-layer capacitance: (i) physical power that drives apart the bubbles from the catalyst surface and (ii) secondary Bjerknes force, ,, a radiative force exerted by the acoustic (ultrasonic) field , to the gas bubbles which can release the bubbles from the catalyst surface. This force, as depicted in Figure , has two positive impacts on the bubble removal process, (i) reducing bubble diameter by a gradient of force and (ii) dragging the newly appeared small nuclei trapped inside the catalyst network toward each other that accelerates the bubble coalescence on the catalyst surface .…”

Section: Resultsmentioning

confidence: 99%

Multiple Bubble Removal Strategies to Promote Oxygen Evolution Reaction: Mechanistic Understandings from Orientation, Rotation, and Sonication Perspectives

Karimi,

Sharma,

Morgen

et al. 2023

ACS Appl. Mater. Interfaces

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Bubble coverage of catalytically active sites is one of the well-known bottlenecks to the kinetics of the oxygen evolution reaction (OER). Herein, various bubble removal approaches (electrode orientation, rotating, and sonication) were considered for the OER performance evaluation of a state-of-the-art Ir-based electrocatalyst. Key parameters, such as catalyst mass loss, activity, overpotential, and charge- and mass-transfer mechanisms, were analyzed. First, it was suggested that a suitable orientation of the working electrode facilitates coalescence and sliding bubble effects on the catalyst surface, leading to better electrochemical performance than those of the traditional rotating disk electrode (RDE) configuration. Then, the convection and secondary Bjerknes force were explained as the responsible phenomena in improving the OER activity in the RDE and sonication methods. Finally, simultaneous implementation of the methods enhanced the catalyst mass activity up to 164% and provided fast charge-transfer kinetics and low double-layer capacitance, which eventually led to a 22% reduction in overpotential, while the catalyst loss slightly increased from 1.93 to 3.88%.

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Section: Resultsmentioning

confidence: 99%

Multiple Bubble Removal Strategies to Promote Oxygen Evolution Reaction: Mechanistic Understandings from Orientation, Rotation, and Sonication Perspectives

Karimi,

Sharma,

Morgen

et al. 2023

ACS Appl. Mater. Interfaces

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“…的振动而显著抑制小气泡的振动, 且气泡间距离变小可有效抑制气泡的非线性特征. 双泡体系中气泡的非球形形变会导致气泡间的次级 Bjerknes 力的方向与球形振动情况下的存在差异 [12] , 并且会显著的增大气泡间的相互作用力 [18] . 当双泡体系附近出现其他气泡时, 该气泡对双泡间的相互作用有调制影响 [19] , 且调制效应与气泡的相对尺寸密切相关; 在弱振动情况下, 若邻近气泡的半径大于 (或小于)共振半径时, 双泡间的平衡距离将增大(或减小).…”

Section: 振荡与平移运动进行的数值研究发现气泡间的相互作用会轻微的增强大气泡unclassified

Analysis of suppressive effect of large bubbles on oscillation of cavitation bubble in cavitation field

Huang¹,

Fan²,

Tian³

et al. 2023

Acta Phys. Sin.

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In this paper, the interaction of multiple bubbles in the cavitation field is investigated in combination with the phenomenon of small bubbles hovering around large bubbles observed experimentally. A model composed of three bubbles is developed and the dynamic behavior of cavitation bubble is analyzed. By considering the time delay effect of the interaction between bubbles and the nonspherical oscillation of large bubbles, the modified bubble dynamic equations are obtained. Numerical results show that the nonspherical effect of large bubbles has little effect on the oscillation of cavitation bubble. The suppressive effect of large bubble on cavitation bubble is closely related to the radius of the large bubble. The larger the size of the large bubble, the stronger the inhibition. When the size of large bubble is close to the resonant radius, the oscillation of cavitation bubble appears coupled resonance response, and the maximum expansion radius of bubble appears resonance peak. The distribution of the secondary Bjerknes force with bubble radius and the separation distances is strongly influenced by driving frequencies or sound pressures. When the large bubble is in the submillimeter order, the strength of the secondary Bjerknes force and the acoustic response mode are different due to the different strength of the nonlinear response of the cavitation bubble. As the distance decreases, when the acoustic pressure increases to a certain value, the secondary Bjerknes force on the cavitation bubble decreases due to abnormal acoustic absorption. The secondary Bjerknes force on cavitation bubble is likely to be repulsive at different separation distances. The theoretical results accord well with experimental phenomenon.

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“…They discovered that the SBF on the two deformed bubbles was significantly higher than that on two spherical bubbles under the same conditions when the bubbles steadily oscillated in the sound field. Zhang et al [14] investigated the influence of translational motion on the SBF between two oscillating bubbles and between two bubbles with tiny translational motions and found that the SBFs of bubbles with larger translational motions are increased.…”

Section: Introductionmentioning

confidence: 99%

Refined secondary Bjerknes force equation for double bubbles with pulsation, translation, and deformation

Liu,

Wang,

Liang

et al. 2024

Ultrasonics Sonochemistry

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Effects of translational motion on the Bjerknes forces of bubbles activated by strong acoustic waves

Cited by 14 publications

References 39 publications

Multiple Bubble Removal Strategies to Promote Oxygen Evolution Reaction: Mechanistic Understandings from Orientation, Rotation, and Sonication Perspectives

Multiple Bubble Removal Strategies to Promote Oxygen Evolution Reaction: Mechanistic Understandings from Orientation, Rotation, and Sonication Perspectives

Analysis of suppressive effect of large bubbles on oscillation of cavitation bubble in cavitation field

Refined secondary Bjerknes force equation for double bubbles with pulsation, translation, and deformation

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