Article
Chemistry, Physical
Shoya Mohseni-Mofidi, Eric Drescher, Harald Kruggel-Emden, Matthias Teschner, Claas Bierwisch
Summary: This paper proposes a methodology to numerically investigate erosion behavior of ductile materials and develops a new contact model. The numerical predictions of erosion are compared with experiments, showing accurate prediction of erosion behavior as a function of impact angle. Using this methodology, the effect of solid particle shapes is studied and conclusions are drawn.
Article
Materials Science, Multidisciplinary
Yifan Liu, Guilu Qin, Jian Wang, Liangjun Yin, Xian Jian, Mingxia Wu
Summary: Ultrasound-assisted electrical discharge is an affordable and easy method for preparing metallic powder for sintering micro-components. The size distribution of the powder affects the sintering performance and mechanical properties of the components. By conducting an orthogonal experiment, the study found that pulse width, current, and ultrasonic power significantly reduce the average particle size (D50). A regression equation was then developed to predict the D50 value. Through the multi-physical field sintering method, nearly full-density micro-cylinder parts with high bonding force and compression resistance were obtained at a sintering temperature of 900°C due to the combination of micron and nano-size powder.
Article
Engineering, Chemical
Ri Zhang, Lun Sun, Yiqiang Li, Jifu Yin
Summary: A new numerical procedure is proposed to analyze solid particle erosion caused by slurry. The procedure involves two mechanisms: tracking high-concentration particles as a continuous granular phase and converting the continuous granular phase near the pipe wall into discrete incident and rebound particles. The validity of the procedure is confirmed through comparison with experimental data, and its performance and efficiency are compared with other methods.
Article
Engineering, Chemical
Ri Zhang, Guanhua Zhao
Summary: The numerical procedure involving the dense discrete phase model (DDPM) is used to calculate solid particle erosion. DDPM works in two mechanisms to evaluate the interaction among particles and reflect the blocking effect of high-concentration particles. The predicted erosion contours of DDPM are more uniform and smoother than the DEM-predicted contours.
ADVANCED POWDER TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Shin-Ichiro Yamaguchi, Qilin Xie, Fumiya Ito, Kazuki Terao, Yoshinobu Kato, Miki Kuroiwa, Satoshi Omori, Hideo Taniura, Kengo Kinoshita, Takuya Takahashi, Shinya Toyokuni, Kota Kasahara, Masafumi Nakayama
Summary: This study reveals the importance of aromatic clusters in the receptor extracellular loop in recognizing carbon nanotubes and suggests inhibiting the Syk signalling pathway as a potential treatment for inflammation. In silico screening identified the receptors Siglec-5 and Siglec-14 as the ones recognizing carbon nanotubes. Molecular dynamics simulations showed stable association between aromatic residues on Siglec-5 and carbon nanotubes. Further experiments demonstrated that Siglec-14 mediates the phagocytosis of CNTs and induces proinflammatory responses, which can be blocked by a Syk inhibitor.
NATURE NANOTECHNOLOGY
(2023)
Article
Engineering, Mechanical
Pooja Verma, Rajnesh Tyagi, Sunil Mohan
Summary: The present study analyzes the effect of microstructure on erosive wear of medium carbon, dual phase, and fully martensitic steels at different velocities and impingement angles using Al2O3 as an erodent. The findings show that the erosion rate increases with impact velocity for all materials but decreases with impact angle for all steels except for fully martensitic steel. The dual phase steel exhibits higher erosion resistance due to the arrest of cracks by the hard martensite island and the balanced combination of strength and ductility.
Article
Engineering, Multidisciplinary
Lu Liu, Yu Wang, Kai Zhang, Lingrong Kong
Summary: In this study, slurry erosion experiments and computational fluid dynamics simulations were conducted to investigate the effect of particle impact velocity and erosion mechanisms on the surface of 38CrMoAlA steel. The results showed that uneven erosive wear occurred on the surface of clearance material, which can be attributed to the variation of particle impact angle affected by fluid streamlines. The most severe erosion site and area changed with the particle impact velocity, and the failure of the clearance material was mainly caused by localized erosion wear. To prolong the service life of downhole tools, the region downstream of the clearance inlet (10 mm from the inlet) should be given priority.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Materials Science, Multidisciplinary
Jialing Xu, Cheryl Slykas, Adam S. Braegelman, Kevin Gabriel Alvarez, Thomas Kasl, Bryan W. Boudouris, Matthew J. Webber, Vivek Sharma, William A. Phillip
Summary: In this study, direct-ink-writing 3D printing was combined with surface segregation and vapor-induced phase separation (SVIPS) to create hierarchically structured sorbents. These sorbents can effectively separate trace analytes from complex mixtures and treat solutions under dynamic flow conditions.
Article
Engineering, Chemical
Feng Zhou, Jianping Li, Daolong Yang, Yuze Li, Jiangnan Luo
Summary: In pneumatic conveying of coal particles, the elbow shape and airflow velocity significantly affect erosion, particle breakage, and pressure drop, while particle size and gas supply pressure have significant effects on pressure drop. The optimal parameters include a blind elbow with a plug, particle size of 9-11 mm, airflow velocity of 20 m/s, and gas supply pressure of 0.4 MPa.
Article
Biochemistry & Molecular Biology
Ashraf Ali, Sarah Alharthi, Bashir Ahmad, Alia Naz, Idrees Khan, Fazal Mabood
Summary: Chemically modified silica monolith particles were prepared for the adsorptive removal of lead (II) ions from aqueous medium. The adsorbent showed an adsorption capacity of 792 mg/g for Pb(II) ions, with a 98% adsorption rate under optimal conditions of pH 5, 0.4 g/L adsorbent dose, 500 mg/L Pb(II) ion concentration, and 1 hour adsorption time. The adsorption data fitted well with Freundlich and Langmuir isotherm models, and the adsorption process followed a pseudo second-order kinetic model, suggesting spontaneous and exothermic adsorption.
Article
Mechanics
Carlos Lajusticia-Costan, Silvia N. Santalla, Javier Rodriguez-Laguna, Elka Korutcheva
Summary: This paper discusses random walkers that deform the medium as they move, creating an effective attraction between walkers mediated by the medium, which can be regarded as a space metric. In the strong-deformability regime, diffusion is initially described by the porous medium equation, leading to subdiffusive behavior of an initially localized cloud of particles. The differences in growth rates can be explained by strong correlations between particles, explored through fluctuations of the center of mass of the cloud and the average density measured by the particles themselves.
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT
(2021)
Article
Energy & Fuels
Haw Yueh Tang, Henry Chee Yew Foo, Inn Shi Tan, Man Kee Lam
Summary: Extraction and delivery of raw materials in engineering industries are inevitably polluted with sand particles that caused several flow assurance problems. The study developed a modified erosion model to address the shape randomness in sand particles distribution and conducted high-fidelity simulation of sand particle trajectories in a pipeline bend using CFD-DEM method. Modification of the particle shape factor based on the generated database resulted in significantly improved accuracy in predicting erosion rate.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Engineering, Mechanical
Dingkang Xia, Kunpeng Su, Jianhua Wu, Zhiyu Ding
Summary: Ultrasound technology shows promise for wastewater treatment, but faces challenges in industrial application and scaling up, such as ultrasonic horn tip erosion. The synergy between cavitation and solid particle erosion in solid-liquid flow systems remains unclear, and the influence of solids motion is relatively unknown. Through analysis and testing, it was found that synergistic erosion depends on solid particle flux, local solids concentration, and velocity, with higher concentrations and velocities aggravating the erosion. This understanding can contribute to erosion prediction and the optimization of ultrasound applications in wastewater treatment processes.
Article
Environmental Sciences
Lise Marie Frohn, Matthias Ketzel, Jesper Heile Christensen, Jorgen Brandt, Ulas Im, Andreas Massling, Christopher Andersen, Marlene Schmidt Plejdrup, Ole-Kenneth Nielsen, Hugo Denier van der Gon, Astrid Manders-Groot, Ole Raaschou-Nielsen
Summary: An integrated model system has been developed and extended with a dynamic aerosol module to better account for particle number concentrations, showing some capability of reproducing observed patterns while needing improvement in emission inventories and volatile organic compound treatment.
ATMOSPHERIC ENVIRONMENT
(2021)
Article
Engineering, Mechanical
Leonel A. Teran, Santiago Lain, Sara A. Rodriguez
Summary: A new model capable of predicting the synergistic effect of cavitation damage and hard particle erosion was developed and validated through CFD simulations and experimental results, showing good agreement between the two.
