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
Engineering, Mechanical
A. Abouel-Kasem, O. O. Osman, S. A. Karrab, S. M. Ahmed
Summary: Stepwise cavitation erosion was used to study pits formed by microjets. The study aimed to determine the role of pits in the development of cavitation erosion damage, including their geometrical features and count. The results showed that the shape and size of the microjet pits remained unchanged during the test time and did not impact the evolution of cavitation damage. Slip bands were identified as the dominant factor in cavitation development.
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
(2022)
Article
Acoustics
Lingtao Zou, Jing Luo, Weilin Xu, Yanwei Zhai, Jie Li, Tong Qu, Guihua Fu
Summary: This study investigates the influence of particles on shockwaves during bubble collapse. The presence of particles alters the consistency of the liquid medium, resulting in the emission of water hammer shockwaves and implosion shockwaves. The shape of particles and the relative distance between the bubble and particles affect the formation of stratified shockwaves.
ULTRASONICS SONOCHEMISTRY
(2023)
Article
Engineering, Mechanical
Zhenhua Wang, Yong Wang
Summary: In this study, pure titanium and 18Mn18Cr0.6 N austenitic stainless steel were selected as model materials to investigate their surface compositions and hydrogen concentration changes when immersed or exposed to cavitation erosion in ultrapure water. The results showed that the yields of H- from the eroded specimens were significantly higher than those from the immersed specimens, indicating the involvement of hydrogen in the process of cavitation erosion.
Article
Engineering, Mechanical
Janusz Steller
Summary: The author proposed a fractional approach to model cavitation erosion kinetics over two decades ago in response to issues in material resistance assessments from the International Cavitation Erosion Test project. The current status, potential, and limitations of the methodology were summarized in a paper published by Wear in 2020, along with details of the computational algorithm and examples illustrating the methodology description. Prospects for further development of the methodology are discussed in the paper.
Article
Materials Science, Coatings & Films
Feng Cheng, Fujia Wu, Linlin Liu, Shifei Yang, Weixi Ji
Summary: Cavitation tests were conducted on three heterogeneous multilayer DLC films to evaluate their erosion resistance, showing that Ti/DLC film had the lowest erosion area. The presence of titanium as an adhesion layer improved adhesion strength, reduced residual stress, and decreased cracks within the films. Lower I-D/I-G ratio was also found to enhance fatigue resistance in the steady phase.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Engineering, Mechanical
Zhenhua Wang, Bing Zhang
Summary: Pure Ti has potential applications in desalination, chemical industries, and construction of seagoing vessels. Cavitation erosion can be a significant concern in these applications. The study found that triple junctions and grain boundaries are preferential sites for cavitation damage initiation.
Article
Engineering, Mechanical
Reza Karimi Bakhshandi, Anton Tkachuk, Mohamed Sadek, Jens Bergstrom, Mikael Grehk
Summary: Top hammer drilling is a common method for drilling holes in rock formations. This study focuses on the failure mechanisms of two cylindrical impact pistons subjected to impact loading. The failure started with degradation of the impact surfaces, leading to the formation of holes and cracks, ultimately resulting in fatigue fracture.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Multidisciplinary Sciences
Tianyu Xu, Zonglei Li, Sanlin Bao, Yanru Su, Zhouming Su, Shuteng Zhi, Ennan Zheng
Summary: English Summary: Panax notoginseng, also known as Sanqi, plays a significant role in medicinal and economic fields. The hydraulic pathway restriction is identified as the primary limitation to its optimal growth state. By conducting experimental anatomy and numerical simulation, the vessel structure parameters and flow resistance characteristics of Panax notoginseng were investigated. The results showed that different vessel types and secondary thickening structures influenced the flow resistance and water transport efficiency. The study also revealed the correlation between vessel structure parameters and flow resistance coefficient (xi), highlighting the influence of annular (pitted) height and annular (pitted) inscribed circle diameter on xi.
Article
Engineering, Marine
Peng Chi, Zhang Shilong, Fu Jianhong, Li Qinfeng, Su Yu, Chang Hao, Chen Yuxuan, Yang Yun
Summary: This study investigates the feasibility of using a cavitation jet for drilling and stimulating shale gas reservoirs, and conducts erosion experiments on shale under different hydraulic conditions. The study finds that the optimal nozzle position increases linearly with upstream pressure, and a higher upstream pressure results in a greater erosion rate. The study also discusses the erosion mechanism and the impact of erosion time on reservoir permeability.
Article
Chemistry, Physical
K. Siemek, M. K. Eseev, P. Horodek, A. G. Kobets, I. Kuziv
Summary: The study on the defects evolution in nickel aluminum bronze CuAl9Ni4Fe4 subjected to cavitation under mild conditions for up to 8 hours revealed two different stages of cavitation erosion. The initial stage of up to 6 hours involved the removal of residual roughness and surface oxides, while in the maximal erosion rate region, large vacancy clusters were observed with a drastic increase in concentration compared to the incubation period.
APPLIED SURFACE SCIENCE
(2021)
Article
Engineering, Mechanical
Theresa Trummler, Steffen J. Schmidt, Nikolaus A. Adams
Summary: In this study, we numerically investigate the erosion potential of a cavitating liquid jet using high-resolution finite volume simulations. A barotropic equilibrium cavitation approach embedded into a homogeneous mixture model is employed as the thermodynamic model. The effects of collapsing vapor structures are resolved by considering full compressibility. Two different operating points with different cavitation intensities are analyzed, and their erosion potential is estimated and compared using various methods including collapse detection, maximum pressure distribution on the wall, and a new method of generating numerical pit equivalents. The data of numerical pit equivalents is analyzed in detail and compared with experimental data. Furthermore, a comprehensive grid study is presented for both operating points.
Article
Acoustics
Jiupeng Xiong, Yalu Liu, Chenghai Li, Yufeng Zhou, Faqi Li
Summary: Cavitation erosion at high hydrostatic pressure can cause abnormal operation of equipment and huge economic losses. Through experiments and theoretical derivation, a microjet impact model of cavitation erosion was successfully established, and a method to calculate the microjet velocity was proposed based on the model.
ULTRASONICS SONOCHEMISTRY
(2022)
Article
Engineering, Manufacturing
Yang Guo, Pei Qiu, Shaolin Xu, Gary J. Cheng
Summary: Liquid-assisted laser ablation has the advantage of relieving thermal effects but can also deteriorate laser beam transmission stability. A continuous and directional high-speed microjet can be formed through laser-induced cavitation bubbles, which helps to remove debris and improve material removal process and surface quality.
INTERNATIONAL JOURNAL OF EXTREME MANUFACTURING
(2022)
Article
Engineering, Multidisciplinary
Lu-Wen Zhang, Jia-Yu Ye
Summary: The challenge of material surface damage caused by high-frequency, high-pressure jets due to cavitation is a significant concern. In order to better understand the physical mechanisms of cavitation-induced cyclic impact, a multi-field-coupling framework was developed. This framework includes important processes such as polymer deformation, thermal and strain softening, and damage evolution, and allows for accurate simulation and study of this phenomenon.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2023)
