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, Mechanical
Zhengwei Li, Zhiwu Xu, Peng He, Zhongwei Ma, Shu Chen, Jiuchun Yan
Summary: The characteristics of cavitation bubbles during the spreading of eutectic GaIn liquid droplet subjected to ultrasonication were studied in-situ by high-speed photography. It was found that the bubble density decreases gradually during the droplet spreading process and cavitation exhibits strong/weak changes with a periodicity of dozens of acoustic periods.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Acoustics
Takuya Yamamoto, Ryo Matsutaka, Sergey Komarov
Summary: This study used high-speed imaging techniques to investigate the interaction between acoustic cavitation bubbles and gallium droplets, revealing the formation of fine droplets during emulsification under ultrasound irradiation for the first time. The detachment of fine gallium droplets from the water-gallium interface during the collapse of large cavitation bubbles was identified as a key mechanism for emulsification phenomena. The generation of high-velocity liquid jets following the collapse of cavitation bubbles was found to be the primary cause of liquid emulsification.
ULTRASONICS SONOCHEMISTRY
(2021)
Article
Optics
Jongchan Park, Liang Gao
Summary: Modern cameras are limited in capturing optical information by electronic data transfer bandwidth, resulting in reduced resolution. To address this issue, a continuously streaming compressed high-speed photography technique was developed. By performing compressed imaging in a time-delay-integration manner, it was possible to record high-resolution videos at a high speed.
Article
Mechanics
Majid Rodgar, Helene Scolan, Jean-Louis Marie, Delphine Doppler, Jean-Philippe Matas
Summary: The study experimentally examined the behavior of a bubble injected into a horizontal liquid solid-body rotating flow, showing how factors such as bubble size, rotation speed, and buoyancy impact the bubble's aspect ratio and movement. The study also found that at certain extreme conditions, such as when the Reynolds number exceeds 3000, the bubble can experience abrupt transitions and potentially break up due to resonance between the periodic forcing of the rotating cell and the eigenmodes of the stretched bubble.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Engineering, Electrical & Electronic
Satoshi Yuura, Yasumasa Watanabe, Katsushi Furutani, Taro Handa
Summary: This study introduces a new synthetic-jet actuator, called ultrasonic-driven synthetic-jet (USDSJ) actuator, which consists of a fixed flat plate and a vibrating flat surface driven by an ultrasonic transducer. The jet created by the actuator is visualized using the schlieren method and it is found that a pulsed jet is created at a high frequency of 19.7 kHz. The estimated jet velocity reaches 150 m/s and is linearly proportional to the vibrating-surface amplitude normalized by the height of the gap.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Mechanics
Adrian Roth, David Frantz, William Chaze, Andrew Corber, Edouard Berrocal
Summary: This paper presents a fundamental study on liquid jet disintegration by providing an extensive open access database of high-speed images and videos captured using Laser Induced Fluorescence (LIF) technology. The study investigates the dynamics of a liquid jet transitioning from the Rayleigh to the atomization regimes. Two high-speed cameras oriented at a 90 degree angle are utilized to simultaneously image the liquid jet and accurately depict the irregular liquid bodies formed in the jet.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2021)
Article
Mechanics
Xiaobin Yang, Cheng Liu, Jingqi Li, Yuxiao Yang, Min Zhao, Changhong Hu
Summary: A diffuse-interface method was developed to simulate the shock wave and high-speed jet characteristics induced by bubble-bubble interaction. The method combined interface compression technique with interface sharpening technique to maintain sharpness of the shock wave and phase interface. High-order scheme WENO and interface sharpening function THINC were used for flux reconstruction at the grid boundary to minimize total variation at the cell boundary. The method was extended to a block-structured adaptive mesh refinement framework to improve grid resolution and save computing resources. Numerical results demonstrated the advantages of the method in simulating complex compressible flows containing shock-shock and shock-interface interactions. An empirical formula for the collapse strength and attenuation of shock waves were developed based on the bubble-bubble interaction process.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2023)
Article
Materials Science, Multidisciplinary
Justin A. Morton, Mohammad Khavari, Ling Qin, Barbara M. Maciejewska, Anastasia Tyurnina, Nicole Grobert, Dmitry G. Eskin, Jiawei Mi, Kyriakos Porfyrakis, Paul Prentice, Iakovos Tzanakis
Summary: By observing the impact of ultrasound and acoustic cavitation on the exfoliation process of graphite in real-time, the dynamic sequence of graphite layer exfoliation was revealed. The generation of pressures up to 5 MPa and liquid jet velocities of 80 m/s were found to be crucial for the initiation and propagation of the exfoliation process, while bubble oscillations associated with stable cavitation were beneficial for promoting a gentler delamination of graphite layers.
Article
Thermodynamics
Uros Orthaber, Matevz Dular, Rok Petkovsek
Summary: The presented study analyzes various jet parameters that occur during and after bubble collapse, and investigates their relationship with the anisotropy parameter near a liquid-liquid interface. By conducting experiments and comparing different interface types, the study reveals important insights into the behavior of cavitation bubbles near liquid-liquid interfaces.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2022)
Article
Mechanics
Sajjad Rezayat, Mohammad Farshchi, Edouard Berrocal
Summary: This paper uses liquid fluorescence high-speed imaging to study the disintegration process of a water jet in a quiescent atmosphere, and analyzes the temporal evolution and variation of breakup length at different breakup regimes. It is found that the liquid jet velocity at the onset of primary breakup oscillates within 6% of the liquid injection velocity for all considered operating conditions.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2021)
Article
Engineering, Environmental
Yudong Liu, Junheng Guo, Wenpeng Li, Wei Li, Jinli Zhang
Summary: Experimental measurements were conducted to investigate the effects of operating conditions and structural configurations of the rotor-stator head on gas-liquid characteristics and power consumption of the jet-flow high shear mixer (HSM). The results showed that gas-liquid mass transfer performance and power consumption were significantly influenced by structural parameters and increasing gas flow rate or reducing surface tension could enhance mass transfer performance. Dimensionless correlations were established based on the experimental data to predict Pog and kLa, providing useful guidance for scaleup design and optimization of the jet-flow HSM.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Biochemistry & Molecular Biology
Rui-Juan Xiong, Yun-Xiao Ren, Yong-Feng Cui, Shu-Feng Cai, Wan-Li He, Xiao-Tao Yuan
Summary: In this study, polymer dispersed liquid crystals (PDLC) composed of PETMP, TMPTA, and PEGD 600 were investigated using high-throughput technology. 125 PDLC samples with different ratios were quickly prepared using ink-jet printing. The electro-optical performance of the samples was detected using machine vision, and the lowest saturation voltage of batch samples was screened out. The results demonstrated the feasibility and promising application prospects of high-throughput preparation and detection of PDLC samples, significantly increasing the efficiency of PDLC sample preparation and detection.
Article
Mechanics
G-Y Yuan, B-Y Ni, Q-G Wu, Y-Z Xue, D-F Han
Summary: Ice breaking is a major challenge in ice-covered water regions, and new methods are constantly being explored. Through experiments, it has been found that high-speed water jets can effectively break ice, potentially serving as a new auxiliary ice-breaking method in the future.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Engineering, Marine
Taiji Tanaka, Yoshihiko Oishi, Hyun Jin Park, Yuji Tasaka, Yuichi Murai, Chiharu Kawakita
Summary: The study demonstrated that air lubrication with repetitive bubble injection achieved superior efficiency in drag reduction compared to continuous bubble injection.
