Article
Mathematics, Interdisciplinary Applications
H. S. Elmsahli, I. C. Sinka
Summary: By designing quasi-spherical particles, control over the interaction between particle shape, size, inter-particle cohesion, and friction can lead to low packing density.
COMPUTATIONAL PARTICLE MECHANICS
(2021)
Article
Engineering, Chemical
Changpu Shen, Yongxiang Li, Xuemeng Xu
Summary: Proper compression of edible powder is beneficial for both the powder itself and industrial production, but the specific influence of factors such as particle size distribution, moisture content, and static friction angle on powder compressibility is not yet clear. This study used uniaxial confined compression experiments to investigate the effects of these factors on powder compressibility, finding that powder volume increases logarithmically with pressure, higher moisture content results in greater void content and poorer fluidity, and larger particle size distribution leads to better fluidity. Additionally, the static friction angle between powder and container affects compressibility to a small extent.
JOURNAL OF FOOD ENGINEERING
(2022)
Article
Engineering, Manufacturing
Rainer J. Hebert, Yu Sun, Mark Aindow, Edward J. Garboczi
Summary: By using XCT and mathematical analysis, this study conducted 3D characterization of five titanium alloy powders, revealing differences between powders and the partial orientation issue of particle projections generated by the DIA instrument.
ADDITIVE MANUFACTURING
(2021)
Article
Chemistry, Multidisciplinary
Tiancong Zhao, Runfeng Lin, Borui Xu, Minchao Liu, Liang Chen, Fan Zhang, Yongfeng Mei, Xiaomin Li, Dongyuan Zhao
Summary: This study investigates the fluid dynamics effects of nanoparticles' interaction with biological barriers. Janus nanoparticles with a badminton-like structure were successfully synthesized, and they showed more stable movement in fluid and reduced organ uptakes compared to conventional spherical nanoparticles.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Tiancong Zhao, Runfeng Lin, Borui Xu, Minchao Liu, Liang Chen, Fan Zhang, Yongfeng Mei, Xiaomin Li, Dongyuan Zhao
Summary: While previous studies on the interaction between nanoparticles and biological barriers mainly focus on the static state, this research investigates the fluid dynamics of nanoparticles and their impact on encountering biological hosts. The researchers successfully synthesized badminton-like Fe3O4&mPDA Janus nanoparticles and studied their stable fluid posture and motion characteristics. The results show that these nanoparticles have reduced blood vessel wall encountering frequency and longer blood half-life compared to conventional spherical nanoparticles.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Construction & Building Technology
Jun Wang, Mengjie Ying, Feiyu Liu, Guohui Yuan, Hongtao Fu
Summary: This study investigated the influence of particle shape on the interface interaction between soil particle and geogrid in reinforced soil structures. Direct shear tests demonstrated that different particle shapes alter the geosynthetic-soil interface shear response under varying normal stresses and geogrid apertures. The results showed that increasing overall regularity led to a decrease in interface shear strength and friction angle.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Chemistry, Physical
Piotr Wroblewski
Summary: The formation of an oil film in internal combustion piston engines differs from that in industrial machinery. The load-carrying capacity and ability to form a lubricated film depend on the molecular adhesion force at the interface between engine parts' surface coating and lubricating oil. The geometry of the lubricating wedge between the piston rings and cylinder wall is determined by the thickness of the oil film and the height of the ring's coverage with oil, influenced by various engine parameters and coatings' physical and chemical parameters.
Article
Materials Science, Multidisciplinary
Hong Guo, Shaofei Wang, Chen Guo, Kuibin Yang, Rui Guo, Jiangtao Fu, Yalin Nan, Mingjiang Tao
Summary: In this study, the effect of particle size distribution on the shear properties of sand was investigated. Direct shear tests were conducted using four types of sand samples with different particle size distributions. The results showed that particle size distribution significantly influenced the internal friction angle. The discrete element results indicated that initial particle size distribution greatly affected porosity, coordination number, and particle slide fraction.
FRONTIERS IN MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
B. L. Checa Fernandez, J. M. Martin, G. Sarriegui, N. Burgos
Summary: This study presents a detailed investigation on the hydrogen decrepitation (HD) process to obtain mono-crystalline Nd-Fe-B powder, and the effect of decrepitation temperature on particle size and shape. The results show that the hydrogenation kinetics and hydrogen absorption are significantly influenced by the temperature, with high temperature leading to monocrystalline particles and low temperature causing detrimental particle cracking. In the temperature range of 150-300 degrees C, controlled fragmentation results in uniform particles with a suitable shape for the development of anisotropic ultrafine powders.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Abdulmuttalip Ari, Suat Akbulut
Summary: In this study, the effect of particle size and shape parameters on shear strength of sand-rubber mixture was investigated. The experiment found that the geometrical properties of sand and rubber particles play a significant role in the evolution of shear strength.
Article
Engineering, Mechanical
Bjorn Michelberger, Dirk Jaitner, Andreas Hagel, Patrick Striemann, Benjamin Kroeger, Andreas Leson, Andres Fabian Lasagni
Summary: An innovative method using a new reciprocating long-stroke tribometer at component level and a new elastohydrodynamic simulation model enable investigation of a greater range of operating conditions in combustion engines. Results show a quantifiable distinction between investigated tribological systems and a high correlation between measured friction results and simulation, allowing for further parameter studies of reciprocating contacts.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Energy & Fuels
Wenxin Zhao, Fangqin Cheng, Yuanyuan Zhang, Peizhen Zhao, Fengling Yang
Summary: This study investigated the evolution mechanism of limestone particles with a wide size distribution in a self-built fluidized bed. The results showed that the particle size distribution of limestone exhibited three stages as a function of reaction time. The effects of attrition, heat stress, calcination, and sulfation on the changes in particle size were quantified and correlated with time. A novel method was proposed to predict the evolution mechanism of limestone with a wide size distribution.
Article
Soil Science
David Nimblad Svensson, Ingmar Messing, Jennie Barron
Summary: Recent studies have found that using laser diffraction method (LDM) for soil particle size analysis can yield compatible results with traditional methods, but requires transformation of clay-silt particle size cutoff. This study tested a combination of approaches for determining LDM values on soil samples and compared the results with sieve and pipette method (SPM). The findings are promising for routine soil analyses, but more research is needed for different types of soils.
SOIL & TILLAGE RESEARCH
(2022)
Article
Mathematics, Interdisciplinary Applications
Cezary Polakowski, Magdalena Ryzak, Agata Sochan, Michal Beczek, Rafal Mazur, Andrzej Bieganowski
Summary: Particle size distribution (PSD) is an important characteristic of many materials, and laser diffraction method (LDM) is commonly used for its determination. However, the theoretical assumptions of LDM, such as spherical shape and random orientation of particles, are often not met. Experimental results using 3D printed models show that when particles deviate from spherical shape, PSDs obtained using LDM have difficult-to-estimate errors, and the more the aspect ratio deviates from unity, the shift towards larger particles becomes more pronounced. The influence of particle shape on measurements could be minimized by designing a measuring cell that forces rotation.
COMPUTATIONAL PARTICLE MECHANICS
(2022)
Article
Engineering, Chemical
Mahdi Habibnejad-korayem, Jiahui Zhang, Yu Zou
Summary: The study found that the flowability of metal powders is significantly influenced by PSD, with larger particle size or narrower PSD enhancing flowability, and multimodal distribution benefiting bulk flow properties. Additionally, powder rheology improves with larger particle size, and dynamic flowability is mainly influenced by particle mean size.
Article
Engineering, Chemical
Martin Zidek, Jiri Rozbroj, Lucie Jezerska, Jan Divis, Jan Necas, Jiri Zegzulka, Matthias Demmler
Summary: This study investigated how different geometric carrier shapes could affect transportation efficiency, wear, and force actions by designing and simulating 53 alternative shapes using DEM. Through experimental verification and validation, the study identified four alternative carrier shapes for the effective area, improving overall efficiency of the conveyor system.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2021)
Article
Chemistry, Multidisciplinary
Gabriel Fedorko, Jan Necas, Jiri Zegzulka, Daniel Gelnar, Vieroslav Molnar, Marianna Tomaskova
Summary: The article presents an innovative methodology for determining operational parameters in abrasive blast cabinets. Results suggest that through simple constructional modifications in the conveying system, unstable operational areas can be eliminated.
APPLIED SCIENCES-BASEL
(2021)
Article
Multidisciplinary Sciences
Daniel Gelnar, Rostislav Prokes, Lucie Jezerska, Jiri Zegzulka
Summary: The study provides a comprehensive overview of the mechanical-physical parameters of transport materials affecting vibratory transport, showing that changing the shape can reduce friction, resistance, and energy consumption during transport. Perfect shapes and lighter particles have lower friction but more pronounced bounce, leading to a lack of typical transport patterns compared to imperfect shapes.
SCIENTIFIC REPORTS
(2021)
Article
Engineering, Chemical
David Zurovec, Lucie Jezerska, Jan Necas, Jakub Hlosta, Jan Divis, Jiri Zegzulka
Summary: The study tested a prototype of a new pellet cooling system, presenting two design variants that could realistically be used, with the variant featuring intense airflow being more energy-intensive but producing higher quality pellets.
Article
Multidisciplinary Sciences
Jiri Zegzulka, Jan Necas, Jiri Rozbroj, Daniel Gelnar, Alvaro Ramirez-Gomez, Lucie Jezerska
Summary: This study aims to find and quantify the possibilities and principles of how particles can change their position relative to other particles, and create a comprehensive model of the internal friction angle of particles to interpret their behavior and application in simulation models.
SCIENTIFIC REPORTS
(2022)
Article
Energy & Fuels
Barbora Grycova, Katerina Klemencova, Lucie Jezerska, Martin Zidek, Pavel Lestinsky
Summary: Torrefied biomass is a high-quality renewable energy commodity that can replace fossil fuels. The influence of pelletization process on torrefaction was studied, and two different process modes were assessed. The results showed that higher torrefaction temperature increased the heating value but negatively affected the mechanical properties.
BIOMASS CONVERSION AND BIOREFINERY
(2022)
Article
Engineering, Chemical
Lucie Jezerska, Rostislav Prokes, Daniel Gelnar, Jiri Zegzulka
Summary: Hard gelatine capsules are still a relevant dosage form in pharmaceutical manufacturing, offering various color and print options for marketing, branding, and patient loyalty. This study investigates the impact of mechanical-physical properties on the behavior of differently filled hard gelatine capsules, highlighting the importance of capsule imbalance in influencing their performance.
Article
Engineering, Chemical
Jan Necas, Jiri Rozbroj, Jakub Hlosta, Jan Divis, Jiri Kapralek, David Zurovec, Jiri Zegzulka
Summary: Shear cell tests were used to investigate the behavior of non-cohesive materials, exploring the relationships between the internal friction angle, the position of the shear lid, and particle rearrangements. The study found that particle bed stiffness is influenced by the shear modulus and coefficient of static friction, while the internal friction angle determines the ability of particle displacement during shear.
Article
Chemistry, Multidisciplinary
Ignacio Garrido-Ceca, Maria Puig-Gamero, Alvaro Ramirez-Gomez
Summary: This study analyzed the influence of bends on the functionality of explosion isolation flap valves through experiments. The results showed that the effect of bends depended on the explosive characteristics of the dust, and for certain dusts, bends increased both pressure and flame velocity. These research findings provide important reference for valve design and the development of standards for assessing their functionality.
APPLIED SCIENCES-BASEL
(2022)
Article
Green & Sustainable Science & Technology
Lucie Jezerska, Veronika Sassmanova, Rostislav Prokes, Daniel Gelnar
Summary: The study investigates the effect of torrefaction on pellets made from coffee grounds, garden chaff, and rapeseed straw. The results show that the torrefaction process increases the heat of combustion and carbon content of the pellets, as well as the ash content. This provides insight into the energy use of waste biomass for pelletization and torrefaction.
