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Showing 1 to 20 of 20 for “"particle breakage"”.
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Investigating the products from different modes of particle breakage testing
… is dependent on the accuracy with which ore breakage can be predicted. This hinges on our understanding of the basic concepts of breakage and the different modes in which it manifests in the comminution environment. Three distinctly different modes of breakage were identified and investigated …
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Particle breakage in sand blasting due to impact on ductile materials
… blasting is one of them, where a stream of sand particles is forcefully projected onto a surface, with compressed air or steam. These sand particles break up into very small pieces upon impact, which are inhaled by workers to cause silicosis. While much research has been done on the surface being …
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Particle breakage and material transport in the design of high-efficiency comminution device
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1991.
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Discrete element method modelling of particle breakage and wear in High Pressure Grinding Rolls
… response of the rolls. The micro-phenomena of particles, such as breakage behaviour and strength weakening were investigated and calibrated by implementing a particle breakage model. This model was employed to simulate the particle breakage occurring during the grinding process, analysing the …
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Sonocrystallization and sonofragmentation
… slurries of ionic or molecular crystals, crystal breakage occurred not by interparticle collision but by direct interactions between crystals and shockwaves. Sonofragmentation rates depended strongly on the strength of the crystal material, as described by its Vickers hardness or Young’s modulus. …
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Mathematical modelling and optimisation of the formulation and manufacture of aggregate food products
… by drying/toasting in an oven. In addition, the particle breakage of granola during pneumatic conveying produced by both a high shear granulator (HSG) and fluidised bed granulator (FBG) process were examined. Products were pneumatically conveyed in a purpose built conveying rig designed to mimic …
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Bubbles and crystals: time-resolved sonoluminescence, sonocrystallization, and sonofragmentation
… are explored here, with emphasis on the breakage of particles post-crystallization. A model compound, aspirin, was crystallized under ultrasonic irradiation and particle morphology and crystal size distributions were compared with other crystallization methods. Particle breakage during …
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Measuring the fracture energy of bed breakage using a short impact load cell
Particle fracture is the elementary process that governs comminution. In industrial machines particle breakage occurs mainly through three mechanisms: impact, abrasion and attrition. Of these mechanisms, impact breakage is known to be the most basic form of particle size reduction. Comminution …
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Aplicação de modelos de quebra de partículas do ambiente de simulação do método dos elementos discretos no estudo de microprocessos de cominuição
… microprocesses were studied using three particle breakage models within the DEM simulation environment: The Bonded Particle Model – BPM, the Fast Breakage Model - FBM, and the Particle Replacement Model – PRM. Such models were calibrated on the basis of the median fracture energy of …
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Multiscale Modeling and Mechanistic Analysis of Crystallization and Particulate Processes
… molecular interactions, nucleation, growth, and particle evolution remain incompletely understood. Key knowledge gaps persist in explaining how solvation dynamics trigger antisolvent crystallization and oiling-out, how reaction kinetics govern the structural evolution of metal- and …
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Optimisation of granola breakfast cereal manufacturing process by wet granulation and pneumatic conveying
… bed process. The study also examined the particle breakage of granola during pneumatic conveying produced by both the high shear granulation and the fluidised bed granulation process. Products were pneumatically conveyed in a purpose built conveying rig designed to mimic product conveying …
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Development of Diagnostic Tools for Use in a Gas Turbine Engine Undergoing Solid Particulate Ingestion
… operations as significant amounts of groundlevel particles can be entrained in the surrounding air and subsequently ingested into the engine. Prolonged exposure to particle ingestion events leads to premature engine wear and, in extreme cases, rapid engine failure. Expanding our current …
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Machine learning techniques for identifying railroad ballast degradation
… is a layer of uniform sized crushed aggregate particles placed between, below and around the crossties. Railroad ballast transfers the load from crossties to the subgrade layer, provides lateral track stability and facilitates the drainage of water. Repeated traffic loading and environmental …
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Characterisation and behaviour of recycled concrete and bricks as engineered fill.
… large quantities were tested and their grading, particle shape and aggregate crushing and impact values established. In addition, large scale equipment was developed for the determination of their compaction and permeability characteristics. An extensive large scale shear box test regime was used …
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Effects of maximum particle size and sample scaling on the mechanical behavior of mine waste rock; a critical state approach
… and systematic study on the effects of maximum particle size and sample scaling on the mechanical behavior of mine waste rock (MWR) is presented. Materials tested were obtained from a similar location within the open pit of Barrick Gold Corporation's Goldstrike gold mine approximately 60 km …
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Developing proxies for routine measurement of ore hardness: A mineral sands case study
The breakage response of an ore during comminution is directly linked to its hardness. Thus, understanding ore hardness variability is paramount to effective mining and processing. Traditionally, ore hardness is measured using single particle breakage tests, such as the JK drop weight test. …
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Batch and continuous production of stable dense suspensions of drug nanoparticles in a wet stirred media mill
… of poorly water-soluble drugs is to reduce particle size of drug crystals down to nanoscale via wet stirred media milling. An increase in total surface area per mass loading of the drug and specific surface area as well as reduced external mass transfer resistance allow a faster dissolution …
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Modeling the dynamics and stresses of elongated particles in vertical axis mixers
… the wet active pharmaceutical ingredient (API) particles. During the drying process, an impeller blade agitates the bed to increase the drying rate and enhance drying uniformity. Unfortunately, the needle-shaped API particles tend to flow poorly, are frequently damaged, and can sometimes form …
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Advancements of Particle-Surface Interaction Studies through Novel Measurement Technique Development and Engineering Modelling
… speeds, pressures, and temperatures, ingested particles can inflict erosion upon the blades, stators, and other components within the operating turbomachinery. Left unchecked, this erosion can lead to an increase in surge and stall probability while also contributing to higher service frequency …
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Examination of stress-induced transformations within multicomponent pharmaceutical crystals
Crystal engineering has advanced the strategies of design and synthesis of organic solids with the main focus being on improving the properties of the developed materials. Research in this area has a significant impact on large-scale manufacturing as industrial processes may give rise, at various …