Article
Mechanics
Mandeep Saini, Erwan Tanne, Michel Arrigoni, Stephane Zaleski, Daniel Fuster
Summary: This work reveals that the response of a spherical cap bubble in contact with a rigid wall is influenced by the effective contact angle before collapse. The findings distinguish between two regimes with significantly different mechanisms of interaction between the collapsing bubble and its surrounding medium. The results have potential applications in various fields including geophysical flows and biomedical applications.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Mechanics
Mauro Rodriguez, Shahaboddin A. Beig, Charlotte N. Barbier, Eric Johnsen
Summary: This study investigates the dynamics and pressures produced by the collapse of a bubble between two parallel rigid walls. It finds that the initial bubble location, confinement and driving pressure have significant effects on the bubble dynamics and pressures.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Mechanics
Zibo Ren, Huan Han, Hao Zeng, Chao Sun, Yoshiyuki Tagawa, Zhigang Zuo, Shuhong Liu
Summary: This study investigates the interactions between a cavitation bubble and a hemispherical pendant oil droplet immersed in water, both experimentally and theoretically. Four typical interactions are observed in experiments, and theoretical models are proposed to calculate the migration of the bubble centroid at the end of the collapse.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Environmental Sciences
Hangbo Duan, Linya Chen, Xiaoyu Liang
Summary: A compressible two-phase solver considering phase transition and thermodynamic effects was developed to study the dynamics of single cavitation bubble collapse near a rigid wall. The accuracy of the method was verified by comparing with experimental results, and the emission process of acoustic energy during the collapse was discussed. The study also found that the bubble-wall distance has a significant effect on the amplitude of acoustic energy, with a critical value.
Article
Engineering, Marine
Zhenkun Tan, Mindi Zhang, Guohao Huang, Biao Huang
Summary: This paper investigates the collapse behavior of cavitation bubble near an air bubble using high-speed photography and schlieren optical method. The analysis of data such as bubble collapse time, collapse position, and the velocity of collapse jet reveals distinct patterns and dynamic features. Compared to cases without air bubble merger, the collapse jet velocity and shock wave intensity are significantly smaller when the cavitation bubble merges with the air bubble. Understanding the influence of air bubble on cavitation bubble has great significance in reducing cavitation damage.
Article
Acoustics
Jinsen Hu, Xuan Lu, Yifan Liu, Jingfei Duan, Yuhang Liu, Jiaxin Yu, Xiaoxiao Zheng, Yuning Zhang, Yuning Zhang
Summary: This paper investigates the jet dynamics and shock waves induced by the cavitation bubble collapsing near two spherical particles using OpenFOAM. The numerical results are validated by experimental data obtained from a high-speed camera cavitation system. The study reveals that bubble split induced by annular jet is the primary feature during bubble collapsing. The localized high pressure produced at the bubble split point is the main reason for jet formation and also serves as the source of the shock waves.
ULTRASONICS SONOCHEMISTRY
(2023)
Article
Acoustics
Jure Zevnik, Matevz Dular
Summary: Hydrodynamic cavitation is a promising method for wastewater treatment due to its ability to eradicate bacteria, inactivate viruses, and destroy biological structures like liposomes. However, the exact damaging mechanisms of hydrodynamic cavitation in different applications remain unknown. This study numerically investigates the interaction between a single cavitation microbubble and a nearby lipid vesicle, identifying three critical modes of vesicle deformation and discussing the critical dimensionless distance for vesicle poration and rupture.
ULTRASONICS SONOCHEMISTRY
(2021)
Article
Multidisciplinary Sciences
Yuning Zhang, Xiaofei Zhang, Xiangqing Zhang, Shurui Zhang, Kehui Zha, Zhaohao Li, Yuning Zhang
Summary: In this paper, an improved model of cavitation bubble dynamics for a single bubble oscillating within a droplet is proposed, considering both the liquid surface tension and viscosity based on the classical Rayleigh-Plesset bubble dynamics equation. Experimental observation of the collapsing process of a bubble within a droplet is conducted using a high-speed photography experimental platform, and numerical solutions for the collapse time of the bubble within the droplet are obtained. The findings include the proposed bubble dynamic equation considering liquid surface tension and viscosity, the classification of liquid droplet surface induced by bubble motion, the classification of bubble interface during the first collapsing stage, and the accurate prediction of bubble collapse time within the droplet under medium radius ratio condition.
Article
Acoustics
Dui Qin, Shuang Lei, Bo Chen, Zhangyong Li, Wei Wang, Xiaojuan Ji
Summary: This study investigates the effects of equation of state (EOS) on the cavitation dynamics of an air-vapor mixture bubble. The results show that the Peng-Robinson (PR) EOS provides a more accurate estimation of the gases within the bubble compared to the Van der Waals (vdW) EOS. Moreover, the Gilmore-PR model predicts a stronger bubble collapse with higher temperature, pressure, and water molecules within the collapsing bubble compared to the Gilmore-vdW model.
ULTRASONICS SONOCHEMISTRY
(2023)
Article
Acoustics
Mok Kun Jeong, Min Joo Choi
Summary: This study proposes a new approach for passive cavitation imaging (PCI) that accurately detects and identifies the location and collapsing strength of cavitation bubbles using a spatial and temporal gating technique.
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
(2022)
Article
Acoustics
Hossein Haghi, Michael C. Kolios
Summary: This study examines the effect of bubble-bubble interactions on the resonance frequency of MB suspensions. It is found that primary delays cause spreading the resonance frequency of identical MBs within a range, where the closest MB to the acoustic source exhibits the lowest resonance frequency and the furthest MB resonates at the highest frequency. The inclusion of secondary delays also significantly affects the resonance frequency, resulting in an increase when the MBs are situated close to each other.
ULTRASONICS SONOCHEMISTRY
(2022)
Article
Chemistry, Physical
Xiaohong Hao, Hang Suo, Hui Peng, Peixing Xu, Xin Gao, Su Du
Summary: This study investigates the effects of temperature, pressure, ultrasonic power and frequency on the bubble motion of ethanol ultrasound cavitation, and further studies the impacts of different process parameters on the extraction rate of algae oil, as well as analyzes the composition of extracted oil.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Joel Puibasset
Summary: The spontaneous formation of tiny bubbles in a liquid is crucial for understanding liquid-to-vapor transitions. These spatially correlated bubbles should be considered as one single density depression of the liquid, known as LDR, instead of multiple independent bubbles. This has significant implications for the characterization of bubble density, understanding the transition process, and molecular simulations.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Optics
Litian Zhang, Lingfei Ji, Honglong Zhang, Xuekun Li, Junqiang Wang, Jincan Zheng
Summary: Experimental results show that the geometrical characteristics of the incubation crater ablated in the bone are closely related to the micro-jet vector. The crater depth and diameter are positively dependent on the micro-jet velocity and micro-jet diameter, while crater's diameter-to-depth ratio is negatively correlated with the microjet velocity. The corresponding micro-jet impact strength on the bone tissue is about 85.2-123.5 MPa, with the micro-jet velocity ranging from 24 m/s to 35 m/s, and the impact pressure decreases rapidly along the central axis outward, resulting in the U-shaped ablation crater.
OPTICS AND LASERS IN ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Minglei Shan, Fangyong Shu, Yu Yang, Yu Shang, Cheng Yin, Qingbang Han
Summary: Collapsing cavitation bubbles have various applications in material surface cleaning, medical imaging, and sterilization. This study established a model for cavitation bubble collapse near a complex solid wall using the lattice Boltzmann method. The morphological changes of the collapsing bubble were quantitatively analyzed using the Minkowski functionals-based morphological analysis method. The interaction mechanism between the bubble and solid wall was investigated, and the influences of solid wall conditions and position parameters on collapsing bubbles were discussed.
APPLIED SCIENCES-BASEL
(2023)
Article
Environmental Sciences
Aouattef Belghit, Slimane Merouani, Oualid Hamdaoui, Mohammed Bouhelassa, Saeed Al-Zahrani
Summary: The study found that the UV/chlorine advanced oxidation process for degrading specific dye is influenced by different mineral anions, organic substrates, and environmental matrices. Some anions like bromide, bicarbonate, and chloride enhance dye degradation, while others like sulphate and nitrite inhibit the process. Natural organic matter and surfactants also impact degradation rates.
ENVIRONMENTAL TECHNOLOGY
(2022)
Article
Acoustics
Aissa Dehane, Slimane Merouani, Oualid Hamdaoui, Muthupandian Ashokkumar
Summary: This paper introduces a novel technique that links the chemistry of a single bubble to the overall chemistry in a sonochemical reactor, in order to determine the number of active bubbles in a sonicated solution. The impact of ultrasonic frequency on the number density of bubbles is studied and compared with existing literature data, showing a high level of consistency.
ULTRASONICS SONOCHEMISTRY
(2022)
Article
Acoustics
Oualid Hamdaoui, Slimane Merouani, Meriem Ait Idir, Hadjer C. Benmahmoud, Aissa Dehane, Abdulaziz Alghyamah
Summary: This study evaluates the effectiveness of combining ultrasound and chlorine for the degradation of textile dye, and investigates the impact of mineral water constituents and natural organic matter on this process. The results show that the combination of ultrasound and chlorine greatly enhances the degradation rate of the dye, and the effectiveness depends on the type and concentration of additives. The study provides important insights into the mechanism of chlorine activation by ultrasound for organic compounds degradation in water.
ULTRASONICS SONOCHEMISTRY
(2022)
Article
Energy & Fuels
Abdelhalim Fetimi, Attef Daas, Slimane Merouani, Abdullah M. Alswieleh, Mourad Hamachi, Oualid Hamdaoui, Ounissa Kebiche-Senhadji, Krishna Kumar Yadav, Byong-Hun Jeon, Yacine Benguerba
Summary: The combination of Box-Behnken design, artificial neural network, particle swarm optimization, and response surface methodology was utilized to predict emulsion breakdown in the ELM process, with the hybrid ANN-PSO model outperforming the RSM in identifying optimal ANN parameters and accurately forecasting emulsion breaking percentages. This hybrid approach may serve as a valuable optimization tool for predicting critical data for ELM stability under various operating conditions.
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2022)
Article
Engineering, Environmental
Aissa Dehane, Slimane Merouani, Oualid Hamdaoui
Summary: The effect of methanol concentration on the sonochemical production of hydrogen was investigated through numerical simulations. It was found that the maximal efficiency for hydrogen yielding and the broadness of active bubbles range were obtained at methanol concentrations between 7% and 20%. However, a decrease in the active bubbles range was observed for methanol concentrations greater than 20%.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Energy & Fuels
Messaouda Hamida, Aissa Dehane, Slimane Merouani, Oualid Hamdaoui, Muthupandian Ashokkumar
Summary: The present study combines experimental degradation findings and numerical simulation results to investigate the mechanism and operational conditions of CCl4 sonochemistry. The results show that the degradation rate of SO is significantly enhanced in the presence of CCl4, mainly due to the reactive chlorine species and reactive oxygen species generated within hot bubbles. In addition, the liquid temperature and CCl4 concentration also play important roles in the degradation process.
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2022)
Article
Green & Sustainable Science & Technology
Slimane Merouani, Aissa Dehane, Aouattef Belghit, Oualid Hamdaoui, Yasser A. Tobba, Chouaib Lahlou, Maulin P. Shah
Summary: This research aims to optimize the effects of various factors on the Fe(II)/K2S2O8/hydroxylamine process in the degradation of pararosaniline. The addition of hydroxylamine greatly enhances the degradation rate of pararosaniline compared to the traditional Fe(II)/KPS system. The dominant reactive species varies in the presence of hydroxylamine, and the efficiency of the process is influenced by reactant doses and solution pH.
CLEAN-SOIL AIR WATER
(2023)
Article
Chemistry, Physical
Aissa Dehane, Slimane Merouani, Oualid Hamdaoui, Kyuichi Yasui, Muthupandian Ashokkumar
Summary: In sonochemistry, acoustic bubbles serve as microreactors for producing hydrogen and oxidants. This study developed a novel semi-empirical method using hydrogen sono-production to determine the number density of micro-bubbles during water sonolysis. The results showed that the number density of bubbles ranged from -108 to -1013 L-1 s-1, depending on the experimental conditions, and the calculation method used. The study also found that the number of active bubbles increased with frequency, but decreased when calculated via the total single-bubble yield, especially at higher frequencies and colder liquid temperatures.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Biochemistry & Molecular Biology
Lamia Ouettar, El-Khamssa Guechi, Oualid Hamdaoui, Nadia Fertikh, Fethi Saoudi, Abudulaziz Alghyamah
Summary: This study investigated the use of Alfa leaf powder (ALP) as a biosorbent for the removal of malachite green and crystal violet dyes from water. The results showed that increasing the initial dye concentration, contact time, temperature, and pH lead to an increase in biosorbed quantity. The biosorption process was found to be spontaneous and endothermic.
Article
Acoustics
Intissar Gasmi, Oualid Hamdaoui, Hamza Ferkous, Abdulaziz Alghyamah
Summary: The intensive use of pharmaceuticals and drugs has resulted in increased concentrations of these substances in industrial wastewater. This study examined the degradation and mineralization of furosemide (FSM) in water using sonochemical processes. The results showed that the degradation rate of FSM increased with higher acoustic intensity and lower ultrasonic frequency. The initial concentration of FSM also influenced the degradation rate. These findings suggest that sonochemical advanced oxidation processes can be an effective technique for treating water contaminated with FSM.
ULTRASONICS SONOCHEMISTRY
(2023)
Article
Chemistry, Physical
Hana Bouchoucha, Salim Bekkouche, Slimane Merouani, Aissa Dehane, Oualid Hamdaoui
Summary: In recent years, there has been increasing interest in using UV/chlorine advanced oxidation processes for wastewater treatment. However, few studies have investigated this process in strongly basic mediums, which is commonly found in industrial effluents. In this study, the use of solar light in the Solar-L/chlorine process for the degradation of Rhodamine B in a strongly basic medium was investigated. The results showed that the Solar-L/chlorine process effectively degraded Rhodamine B, and the addition of TiO2 nanocatalyst further improved the degradation efficiency.
Article
Chemistry, Physical
Meriem Bendjama, Oualid Hamdaoui, Hamza Ferkous, Abdulaziz Alghyamah
Summary: The influence of iodate ions on the photocatalytic process using titanium dioxide was explored in this study. The system UV/TiO2/IO3- showed excellent performance in removing safranin O from water due to the involvement of iodine radicals. Factors such as substrate concentration, TiO2 loading, IO3- concentration, liquid temperature, and initial pH were found to affect the degradation process. The presence of chloride in seawater and high concentrations of natural organic matter were found to hinder the degradation process.
Article
Acoustics
Hamza Ferkous, Oualid Hamdaoui, Christian Petrier
Summary: This study investigates the influence of ultrasound frequency and power on the production of peroxynitrite in alkaline water. It is found that the frequency of ultrasound has a direct impact on peroxynitrite formation, while increasing the power of ultrasound requires more power for peroxynitrite production. Therefore, the formation of peroxynitrite should be considered in chemical reaction studies.
ULTRASONICS SONOCHEMISTRY
(2023)
Article
Acoustics
Hamza Ferkous, Oualid Hamdaoui, Christian Petrier
Summary: The impacts of cylindrical and conical stainless-steel reflectors on the sonochemical oxidation activity of ultrasonication reactors were investigated. It was found that the position and shape of the reflectors significantly influenced the ultrasonic field and acoustic cavitation bubble distribution, thus affecting the sonochemical oxidation activity. The use of a conical reflector improved the triiodide formation rate, while a cylindrical reflector hindered iodide oxidation.
ULTRASONICS SONOCHEMISTRY
(2023)
Article
Acoustics
Atef Chibani, Aissa Dehane, Slimane Merouani, Oualid Hamdaoui
Summary: This study presents the use of a phase change material (PCM) as an alternative cooling system for a sonoreactor, and analyzes the performance of the PCM at different liquid heights and electric powers. Despite the low thermal conductivity of the PCM, promising results were obtained, with the best performance observed at a liquid height of 15.3 cm and an electric power of 60 W.
ULTRASONICS SONOCHEMISTRY
(2023)
