Article
Engineering, Environmental
E. Mohseni, S. F. Reinecke, U. Hampel
Summary: We used acoustic pressure waves to control bubble formation from a submerged sub-millimeter orifice, enabling the generation of continuous fine bubbles. High-speed videometry was used to study the bubble formation and detachment mechanism, as well as the effect of different parameters on bubble size. Analysis of forces acting on the growing bubble revealed the significant effect of liquid inertia on bubble detachment, and new detachment criteria were derived based on experimental results for modeling temporal evolution of bubble size and calculating final bubble volume using the Rayleigh-Plesset equation.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Acoustics
Bai Lichun, Sun Jinguang, Gao Yandong, Xu Weilin, Zeng Zhije, Ma Yuhang, Bai Lixin
Summary: The study found that in an 18.5 kHz ultrasonic field, the circular motion of submillimeter-sized bubbles attached to a boundary exhibits unique characteristics, different from the motion of suspended bubbles in water. This research is helpful to understand and improve industrial applications such as ultrasonic cleaning, sonochemical treatment, and aeration.
ULTRASONICS SONOCHEMISTRY
(2021)
Article
Engineering, Chemical
Sijia Zhao, Ajuan Song, Yijun Cao, Siyuan Yang, Chao Li
Summary: The study proposes a method to enhance static pressure and optimize bubble size by introducing a Y-junction shunting configuration under an oscillatory air supply. The findings show a positive correlation between the shunting ratio and static pressure, and the smallest bubbles are obtained at a shunting ratio of 1.5.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2022)
Article
Engineering, Environmental
Jingting Liu, Haoyang Qi, Yongxing Song, Songying Chen, Dazhuan Wu
Summary: Gas leakage usually occurs in non-circular orifices due to machining accuracy, plugging, and other factors. However, the dynamics of bubbles generated from non-circular orifices have been rarely investigated. This study presents comprehensive information on bubble dynamics from elliptical orifices and analyzes the effects of orifice wall structure on bubble flow pattern and other parameters. The findings provide valuable fundamental information for various applications in chemical engineering and wastewater treatment.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Mechanics
Fabian Denner, Soeren Schenke
Summary: Despite limited attention to models predicting the acoustic emissions and shock formation of pressure-driven bubbles, a numerical framework using a Lagrangian wave tracking approach has been proposed to accurately predict pressure and velocity around pressure-driven bubbles. Validation and testing show good agreement with solutions of the full Navier-Stokes equations and various excitation regimes, demonstrating the effectiveness of the new numerical framework.
Article
Acoustics
K. A. Omoteso, T. O. Roy-Layinde, J. A. Laoye, U. E. Vincent, P. V. E. McClintock
Summary: The research investigates the phenomenon of vibrational resonance in a gas bubble oscillating in an incompressible liquid driven by a dual-frequency force, using both numerical and analytic approaches. It is found that the properties of the liquid significantly contribute to the occurrence of vibrational resonance.
ULTRASONICS SONOCHEMISTRY
(2021)
Article
Engineering, Mechanical
Yang Bai, Yulong Wang, Kun Jia
Summary: Recently, researchers have found that standing surface acoustic waves (SAWs) can induce wrinkles on polymer films. In this study, we theoretically investigate the mechanism behind the acoustic-induced micro-structures on a thin liquid film. We analyze the surface stability of the liquid film and derive the critical conditions for instability. Our theoretical prediction of the favorable film thickness for surface instability agrees well with previous experimental results.
EXTREME MECHANICS LETTERS
(2023)
Article
Engineering, Marine
Yuan Xue, Linjing Yue, Rui Ding, Shufang Zhu, Cuiwei Liu, Yuxing Li
Summary: This paper utilizes numerical simulation to investigate the influence of gas bubbles on the propagation characteristics of leakage acoustic waves in liquid pipelines. It is found that the leakage acoustic waves can be divided into three stages when passing through a single gas bubble, and the influence of each stage on the propagation characteristics is discussed. In gas-liquid two-phase flow, there are two basic mechanisms of gas resistance on wave propagation: elastic resistance effect and drag resistance effect. The results show that the elastic resistance effect has a much greater influence on the sound speed than the drag resistance effect. When propagating through a long gas bubble with a radius of 2 mm and a length of 7 mm, the elastic resistance effect causes a time delay of 0.00038 s while the drag resistance effect only causes a time delay of 0.00002 s. The results of this paper contribute to better understanding the differences in acoustic wave propagation characteristics in gas-liquid two-phase flow, and provide a foundation for the application of acoustic leakage detection methods in gas-liquid two-phase flow pipelines.
Article
Multidisciplinary Sciences
Choon Mahn Park, Geo-Su Yim, Sang Hun Lee
Summary: By designing and fabricating a 2D slice of a metasurface, sound waves can be effectively redirected. The FCOC-based metasurface provides a new method of fabrication and has wide applicability.
SCIENTIFIC REPORTS
(2022)
Article
Mechanics
Yujia Zhou, Bingqiang Ji, Chenru Zhao, Hanliang Bo
Summary: The study investigates the formation dynamics and bursting mechanism of bubbles confined in thin liquid layers, revealing the evolution of bubble size and predicting models for different flow regimes. The role of capillary force exerted by the liquid film and bubble geometry in the liquid layer in modulating the bubble size is demonstrated and discussed. Moreover, a regime map regarding the liquid layer thickness and surface tension is provided, and the criteria between different regimes are discussed based on the bubble geometry analysis and energy balance.
Article
Optics
Risti Suryantari, Yi-hong Shih, Yu-han Shih, Hui-yu Chen, Cen-shawn Wu, Chia-yi Huang
Summary: This work utilizes surface acoustic waves (SAWs) generated by a piezoelectric substrate with an interdigital transducer (IDT) to fabricate a polymer-stabilized blue phase liquid crystal (PS-BPLC) layer. The PS-BPLC layer exhibits a more uniform optical microscope (OM) image and smaller full width at half maximum (FWHM) when a voltage of 2 mV is applied compared to zero voltage. The monodomain structure of the PS-BPLC layer is attributed to the longitudinal and transverse vibrations induced by SAWs in the vertical plane. The proposed method shows potential for low power consumption in the fabrication of reflective optical devices.
Article
Mechanics
Silvestre Roberto Gonzalez-Avila, Fabian Denner, Claus-Dieter Ohl
Summary: In this study, acoustic transients emitted during the collapse of laser-induced cavitation bubbles were analyzed systematically for different standoff parameters. Experimental and numerical results were used to investigate the impact of various parameters on the characteristics of the acoustic signals. It was found that the pressure peaks in the acoustic signals and the amplitude ratio of the first to second acoustic transients are related to the bubble nucleation place and the standoff parameter, gamma.
Article
Materials Science, Multidisciplinary
Larry K. Aagesen, Andrea Jokisaari, Daniel Schwen, Chao Jiang, Anton Schneider, Yongfeng Zhang, Cheng Sun, Jian Gan
Summary: A phase-field model is developed to simulate the formation of void and gas bubble superlattices based on 1D diffusion of self-interstitial atoms. The model can account for superlattice formation by nucleation and growth mechanism and provides insights into the relationship between model parameters and superlattice spacing. The model shows good agreement with experimental observations, except at high gas atom flux rates.
COMPUTATIONAL MATERIALS SCIENCE
(2022)
Article
Engineering, Chemical
Wenwu Zhang, Liwei Hu, Huichuang Li, Baoshan Zhu, Fujun Wang
Summary: This paper simulates a gas-liquid two-phase rotodynamic pump using a bubble coalescence and collapse model, and analyzes the effects of inlet bubble size on the pump's performance and transportability. Computational fluid dynamics methods are used to analyze the pump's external characteristic, gas-liquid flow, phase interaction, and pressure fluctuation as the inlet bubble diameter varies. The results show that the pump's efficiency and pressure rise sharply decrease at smaller inlet bubble sizes, slow down at intermediate sizes, and become stable at larger sizes. The effects of inlet bubble size on flow characteristics in the impeller are larger than that in the guide vane.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2023)
Article
Materials Science, Multidisciplinary
A. N. Afanasiev
Summary: This study calculates the dispersion of acoustic plasmons and Landau parameters in two- and three-dimensional two-component electron-electron and electron-hole liquids at different concentration and mass ratios. The results show that the mode propagation and quasiparticle interaction strength are determined by the intercomponent screening and are asymmetric based on the charge composition of the two-component liquid. A well-defined acoustic plasmon-zero sound mode appears when there is a strong difference in concentrations between components, and its renormalization by the short-range exchange-correlation interaction is negligible. The effective interaction mediated by acoustic plasmons in the fast component is weak, indicating unfavorable conditions for plasmonic superconductivity and the formation of acoustic plasmarons in both two- and three-dimensional electron liquids with parabolic dispersion.
Article
Physics, Fluids & Plasmas
Taku Ashida, Masao Watanabe, Kazumichi Kobayashi, Hiroyuki Fujii, Toshiyuki Sanada
PHYSICAL REVIEW FLUIDS
(2020)
Article
Mechanics
Hiroaki Kusuno, Toshiyuki Sanada
Summary: This paper presents the physical mechanisms for the acceleration and lateral motions of deformable bubbles under stable conditions through numerical simulations. The trailing bubble decreases the drag coefficient relative to a spherical bubble due to increased vorticity generated at the leading bubble surface by its deformation. Additionally, the trailing bubble moves laterally as a result of shear-induced lift force.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2021)
Article
Engineering, Electrical & Electronic
Atsuki Hosaka, Yuki Mizushima, Satomi Hamada, Ryota Koshino, Akira Fukunaga, Toshiyuki Sanada
Summary: The contact-type cleaning method, which involves direct contact of impurities with brushes or brush-induced fluid flow, is used for brush scrubbing. When applying brush cleaning to nanosized defects in advanced semiconductor manufacturing, it is important to understand the interaction between the brush and scrubbing surface under actual operating conditions. High-speed photography was used to observe the brush volume ratio and brush nodule deformation near the surface, providing insights into efficient nanosized cleaning.
MICROELECTRONIC ENGINEERING
(2022)
Article
Chemistry, Analytical
Yuta Matsumoto, Yuki Mizushima, Toshiyuki Sanada
Summary: In this study, we demonstrate a method for removing gas from small holes using acoustic waves. We investigated the mechanism of liquid filling and gas removal in liquids by changing hole size, wettability, and liquid surface tension. Our experimental results show that combining two different frequencies of acoustic waves can completely remove gas in a short period of time. The formation of droplets or films and the approaching and coalescing of gas columns are the dominant mechanisms during the removal process.
Article
Physics, Applied
Masamitsu Kurashita, Akira Fukunaga, Toshiyuki Sanada, Chikako Takatoh
Summary: This study evaluates the phenomena in the interface between a wet PVA sponge and different materials during a chemical mechanical polishing cleaning process. The torques of a rolling wet PVA sponge were measured to determine the effect of surface free energy on the torques between two materials. The results suggest that increasing the rotational speed of a wet PVA sponge decreases some of the torques generated due to hydrogen bonding component interactions.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2022)
Article
Mechanics
Ryunosuke Adachi, Kazumichi Kobayashi, Hiroyuki Fujii, Toshiyuki Sanada, Masao Watanabe
Summary: In this study, we investigated the possibility of wetting failure by examining the rim instability of the liquid sheet ejected after a water drop impacted a dry solid surface. This was made possible through the use of an ultra-high-speed camera.
Article
Instruments & Instrumentation
Yoshia Miyachi, Hajime Furuichi, Toshiyuki Sanada, Yuki Mizushima
Summary: In this study, a phase detection method using a film-based optical waveguide was developed, which can measure the simultaneous local multipoint and high temporal resolution phase detection on a smooth surface. The proposed method can diagnose the dispersed two-phase flow near the wall inside of machines or curved tubes.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2022)
Article
Engineering, Electrical & Electronic
Shota Suzuki, Yuki Mizushima, Satomi Hamada, Ryota Koshino, Akira Fukunaga, Toshiyuki Sanada
Summary: Research finds that cross-contamination occasionally occurs during the cleaning process in semiconductor manufacturing using polyvinyl acetal (PVA) brushes due to the re-deposition of contaminants. To understand why contamination patterns in the form of nodules still occur even when brushes and surfaces are in relative motion, the contact path of roller brush nodules on a rotating plate was studied. The experimental results showed that the stamped contacts of the nodule shape coincide with the recontamination points, occurring in a certain area on the wafer.
MICROELECTRONIC ENGINEERING
(2023)
Article
Nuclear Science & Technology
Hajime Furuichi, Kenichi Katono, Yuki Mizushima, Toshiyuki Sanada
Summary: This study aims to improve the accuracy of measuring liquid film thickness using an optical waveguide film sensor. The sensor detects light reflection at the liquid film surface with high spatial resolution. A signal processing method is proposed to remove measurement errors caused by the curved surface of the liquid film. Numerical investigation shows that the curved surface has negligible effects on the measurement accuracy up to a certain surface curvature.
NUCLEAR SCIENCE AND ENGINEERING
(2023)
Article
Polymer Science
Yoshinori Jinbo, Yuki Mizushima, Toshiyuki Sanada
Summary: This study numerically predicted and controlled the flow of liquid film and the distribution of chemical solution on a rotating disk in single wafer processing using the open-source program OpenFOAM. The obtained results agreed with the literature.
JOURNAL OF PHOTOPOLYMER SCIENCE AND TECHNOLOGY
(2022)
Article
Polymer Science
Atsuki Hosaka, Tsubasa Miyaki, Yuki Mizushima, Satomi Hamada, Ryota Koshino, Akira Fukunaga, Toshiyuki Sanada
Summary: This study investigates nodule deformation and contact area during PVA roller-type brush scrubbing and finds that different brush contact types have a significant impact on the cross-contamination region.
JOURNAL OF PHOTOPOLYMER SCIENCE AND TECHNOLOGY
(2021)
Article
Physics, Fluids & Plasmas
Hiroaki Kusuno, Toshiyuki Sanada
Summary: The research reveals that deformable bubbles repel each other without kissing under certain conditions, demonstrating the flow structures and shapes through experimental and numerical analysis. The findings highlight how the curvature and velocity inside the gap impact the behavior of interacting bubbles, with the emergence of a double-threaded wake indicating repulsion regardless of attraction or repulsion of the bubbles.
Proceedings Paper
Engineering, Mechanical
Yuki Furuya, Toshiyuki Sanada, Masao Watanabe
PROCEEDINGS OF THE ASME/JSME/KSME JOINT FLUIDS ENGINEERING CONFERENCE, 2019, VOL 5
(2019)
Proceedings Paper
Engineering, Mechanical
Hiroaki Kusuno, Toshiyuki Sanada
PROCEEDINGS OF THE ASME/JSME/KSME JOINT FLUIDS ENGINEERING CONFERENCE, 2019, VOL 5
(2019)
Article
Materials Science, Multidisciplinary
Keishi Yamada, Yuki Mizushima, Satomi Hamada, Akira Fukunaga, Hirokuni Hiyama, Toshiyuki Sanada
ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY
(2019)
