Article
Acoustics
Ma Yuhang, Zeng Zhijie, Xu Weilin, Bai Lixin
Summary: Particles in ALF ultrasonic cavitation structures tend to transport predictably along the bubble chain and alternate between aggregation and separation at the focus. The separation occurs during the expansion of cavitation bubbles, while the movement and aggregation mainly happen during the collapse stage.
ULTRASONICS SONOCHEMISTRY
(2021)
Article
Engineering, Chemical
Zhigang Qu, Yunkun Fu, Quanpeng Zhang, Yang An, Xiaopeng Wang, Xin Shan, Yuan Sun, Jianyin Zhao
Summary: Crystal scaling, a common problem in gas-liquid two phase flow pipes, poses a significant threat to production and the environment in various industries. This study investigates the interaction between air bubbles and cavitation bubbles using the finite element method and bubble dynamics equation, analyzing the impact of air bubble size and acoustic pressure on ultrasonic guided wave descaling. Results show that larger air bubbles inhibit cavitation bubble expansion, reducing descaling effectiveness.
Article
Acoustics
Lizhang Jin, Weidong Wang, Yanan Tu, Kanghui Zhang, Ziqi Lv
Summary: Ultrasonic flotation is an effective method for floating fine coal by promoting the aggregation of bubbles and coal bubbles. The frequency of standing waves can affect the formation of aggregates and coal recovery rate.
ULTRASONICS SONOCHEMISTRY
(2021)
Article
Acoustics
Ryeol Park, Minsu Choi, Eun Hyun Park, Won-Jun Shon, Ho-Young Kim, Wonjung Kim
Summary: The study found that gas and vapor cavitation bubbles exhibit different dynamic behaviors and cleaning effects in ultrasonic fields, with each being more effective at removing contaminants with different adhesion strengths. Furthermore, hydrophobic substrates are better cleaned by vapor bubbles. This research not only provides a better understanding of the ultrasonic cleaning process, but also proposes novel techniques for improving cleaning by selectively using gas and vapor bubbles based on surface characteristics.
ULTRASONICS SONOCHEMISTRY
(2021)
Article
Acoustics
Joonas Mustonen, Oskari Tommiska, Axi Holmstroem, Timo Rauhala, Petro Moilanen, Maria Gritsevich, Ari Salmi, Edward Haeggstroem
Summary: The study focuses on addressing pipe fouling in industrial applications by utilizing time-reversed signals to enhance targeted ultrasound cleaning, which has shown to be three times more efficient than standard ultrasound cleaning methods.
ULTRASONICS SONOCHEMISTRY
(2021)
Article
Acoustics
Jianxin Zheng, Yonglei Guo, Lixin Zhu, Hanlin Deng, Yingju Shang
Summary: The ultrasonic cavitation effect has been found to improve machining quality through simulation and experimental studies. Particularly, the cavitation effect generated in the two-dimensional ultrasonic rolling process has a positive impact on processing quality.
Article
Acoustics
Fabian Reuter, Carsten Deiter, Claus -Dieter Ohl
Summary: This study reveals the mechanism behind energy focusing during the non-spherical collapse of cavitation bubbles, leading to the erosion of hardened metals. Using high-speed imaging and shockwave recording, the conditions for this focusing process and its damage to solids are resolved.
ULTRASONICS SONOCHEMISTRY
(2022)
Article
Acoustics
Joydip Mondal, Wu Li, Amgad R. Rezk, Leslie Y. Yeo, Rajaram Lakkaraju, Parthasarathi Ghosh, Muthupandian Ashokkumar
Summary: The study conducted experiments on sonochemical activity using PZT-based ultrasonic units and found that acoustic cavitation plays a dominant role in radical generation, with a strong correlation between sonochemical activity and dissolved gas concentration. Negligible sonochemical activity was observed at near-vacuum conditions.
ULTRASONICS SONOCHEMISTRY
(2021)
Article
Engineering, Mechanical
Jianhua Du, Fengjun Chen
Summary: The study reveals that the dynamics and pressure pulsation associated with cavitation erosion are closely related. A numerical model successfully predicts cavity evolution, volume, and pressure pulsation, demonstrating its reliability. The erosion pattern formed by cavitation is attributed to the distribution of pressure.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Mechanics
Fabian Reuter, Qingyun Zeng, Claus-Dieter Ohl
Summary: This study measures the prolongation factor k of the collapse time for water bubbles near a solid boundary and compares the experimental findings to numerical simulations. The influence of viscosity on k in the near-wall regime is also studied.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Mechanics
Ulisses J. Gutierrez-Hernandez, Fabio De Colle, Claus-Dieter Ohl, Pedro A. Quinto-Su
Summary: In this work, a Fresnel-lens-inspired method is proposed and demonstrated for focusing multiple laser-induced shock waves through time-delay superposition at arbitrary locations. The method has been successfully demonstrated experimentally, showing effectiveness under specific geometric conditions and good agreement with simulation results.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
Ulisses J. Gutierrez-Hernandez, Hendrik Reese, Claus-Dieter Ohl, Pedro A. Quinto-Su
Summary: Researchers have discovered that acoustic cavitation at high frequencies can be achieved through wave propagation in a solid medium. By nucleating cavitation bubbles at nano-sized fractures on a glass substrate and driving their expansion with a leaky Rayleigh wave, and their collapse with a trailing shock wave, the lifetime of the bubbles can be controlled. Experimental results align with simulation models.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Mechanics
Mohammad Khavari, Abhinav Priyadarshi, Andrew Hurrell, Koulis Pericleous, Dmitry Eskin, Iakovos Tzanakis
Summary: This study investigates the shock wave pressures emitted by cavitating bubbles in water under ultrasonic excitation, revealing a resonance peak at a narrow range of frequencies and suggesting its association with shock wave emissions from collapsing bubbles. Results show an increasing pressure shielding effect with higher input power.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Acoustics
W. H. Wu, D. G. Eskin, A. Priyadarshi, T. Subroto, I Tzanakis, W. Zhai
Summary: Gas bubbles play a crucial role in ultrasonic emulsification, affecting droplet size and distribution. The behavior of gas bubbles at the oil-water interface can promote the formation of droplets. Larger gas bubbles collapse and induce the generation of oil-in-water-in-oil and water-in-oil droplets, while smaller bubbles move towards the oil phase, leading to the production of water droplets in the oil phase. Increasing gas content results in more chaotic oscillation of bubbles and smaller, more stable emulsion droplets.
ULTRASONICS SONOCHEMISTRY
(2021)
Article
Acoustics
Gregor Kozmus, Jure Zevnik, Marko Hocevar, Matevz Dular, Martin Petkovsek
Summary: Acoustic cavitation is a commonly used technique with a wide range of applications. The study characterized the cavitation under an ultrasonic horn and proposed a novel acoustic cavitation parameter.
ULTRASONICS SONOCHEMISTRY
(2022)
Article
Energy & Fuels
Xiangning Bu, Tuantuan Zhang, Yuran Chen, Guangyuan Xie, Yaoli Peng
INTERNATIONAL JOURNAL OF COAL PREPARATION AND UTILIZATION
(2020)
Article
Engineering, Chemical
Xiangning Bu, Yuran Chen, Guangxi Ma, Yujin Sun, Chao Ni, Guangyuan Xie
Article
Engineering, Chemical
Yuran Chen, Jing Chang, Adrien Bussonniere, Guangyuan Xie, Qingxia Liu
Review
Acoustics
Yuran Chen, Vu N. T. Truong, Xiangning Bu, Guangyuan Xie
ULTRASONICS SONOCHEMISTRY
(2020)
Article
Acoustics
Yuran Chen, Chao Ni, Guangyuan Xie, Qingxia Liu
ULTRASONICS SONOCHEMISTRY
(2020)
Article
Acoustics
Yuran Chen, Saeed Chehreh Chelgani, Xiangning Bu, Guangyuan Xie
Summary: The study found that the highest metallurgical responses in flotation were achieved under the highest examined USW frequency (600 kHz), while lower frequencies resulted in poorer outcomes. Observation and theoretical calculations revealed that frequency influences the formation of carrier bubbles and the action of secondary acoustic force during USW-assisted flotation, impacting the success of fine particle flotation.
ULTRASONICS SONOCHEMISTRY
(2021)
Article
Electrochemistry
Yapeng Kong, Yu Xiao, Xuemin Liang, Yuran Chen, Liqiang Wang
Summary: The study found that using Ni-Fe alloy as an inert anode in molten state can effectively promote the direct electro-reduction of V2O3, with a rational formation of oxide scale structure that helps improve the quality of the metal vanadium product.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Chemistry, Physical
Chao Ni, Shaoqi Zhou, Jixuan Gao, Xiangning Bu, Yuran Chen, Muidh Alheshibri, Guangyuan Xie, Biao Li
Summary: The recovery of spent carbon anode materials is important for environmental protection and resource recycling. This study analyzed the grinding characteristics of spent carbon anode from aluminum electrolysis in both ball mill and rod mill, and compared them using the selective Fuerstenau upgrading curves. The results showed that carbon particles in the spent carbon anode were closely associated with cryolite particles. Ball milling achieved a higher degree of selective comminution compared to rod milling.
PHYSICOCHEMICAL PROBLEMS OF MINERAL PROCESSING
(2022)
Article
Geochemistry & Geophysics
Chao Ni, Shaoqi Zhou, Xiangning Bu, Muhammad Bilal, Fawad Ul Hassan, Yuran Chen, Guangqian Xu, Guangyuan Xie
Summary: This study characterized a lignite sample from Shaanxi Province, China and found that the fluorine in coal is mainly contained in Muscovite and polylithionite, and partly in pyrite. The proposed combination of gravity-flotation separation process effectively reduced the fluorine content in lignite and met the coal standards.
Review
Engineering, Chemical
Yuran Chen, Pan Li, Xiangning Bu, S. Chehreh Chelgani, Yapeng Kong, Xuemin Liang
Summary: During the long-term operation of an aluminum electrolysis cell, there is a continuous infiltration and corrosion of molten salts on the pot lining, resulting in a significant amount of hazardous waste during maintenance. This study explores the properties of spent pot linings (SPL) and presents methods for detoxification and purification. It also examines the strategies for resource utilization and analyzes the current challenges and future prospects for the environmental recycling of SPL.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Engineering, Chemical
Runze Chen, Yuran Chen, Xuemin Liang, Yapeng Kong, Yangyang Fan, Quan Liu, Zhenyu Yang, Feiying Tang, Johnny Muya Chabu, Maru Dessie Walle, Liqiang Wang
Summary: A chemical oxidative exfoliation method has been developed to recycle spent cathode carbon (SCC) and produce decontaminated SCC with high-value graphene oxide (GO)-like carbon structures (SCC-GO), which exhibits excellent adsorption capacity for organic pollutants.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Engineering, Chemical
Yuran Chen, Pan Li, Xiangning Bu, Liqiang Wang, Xuemin Liang, S. Chehreh Chelgani
Summary: This study introduces an innovative method of oxidation-expansion acid leaching (OEAL) to eliminate impurities inside spent pot lining (SPL). The experimental results show that OEAL has the highest efficiency, with a removal rate of 99.36% for impurities. The fundamental mechanisms of impurity removal were systematically studied using different analytical techniques.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Chemistry, Analytical
Yujin Sun, Ning Jiang, Xianshu Dong, Yuping Fan, Maoqing Yang, Peng Xiong, Yuran Chen
Summary: In this study, the adsorption behavior of cationic polystyrene nanoparticles on amorphous carbon and SiO2 surfaces under different Na+ ion concentrations was investigated. The results showed that higher Na+ ion concentrations led to decreased adsorption capacities and faster adsorption rates on SiO2 surfaces compared to amorphous carbon surfaces.
Article
Materials Science, Multidisciplinary
Yapeng Kong, Yu Xiao, Xuemin Liang, Yangyang Fan, Liqiang Wang, Sheng Yang, Jilin He, Yuran Chen
Summary: We have successfully synthesized nanoscale tantalum powder by electro-deoxidation of Ta2O5 cathode in molten Na3AlF6-K3AlF6-AlF3. The cathodic process involves solid-liquid reaction between Ta2O5 and the electrolyte, forming MxTaO2+xF1-x (M = Na, K) intermediates which are further reduced electrochemically to form tantalum particles. By designing a new porous structure in the Ta2O5 cathode, we achieved the formation of uniform-sized MxTaO2+xF1-x particles with a regular cubic morphology. This study demonstrates the controllable synthesis of nanoscale metal powders and opens up possibilities for developing materials with desired morphology and particle size.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2023)
