Academic literature on the topic 'Particle deposition'

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Journal articles on the topic "Particle deposition"

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Tan, Kun. "Numerical Study on Simulating the Deposition Process of Cold Spray Multi-Particle Al-6061 based on CEL Method." Mechanics and Advanced Technologies 8, no. 1(100) (March 19, 2024): 23–29. http://dx.doi.org/10.20535/2521-1943.2024.8.1(100).295144.

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Cold spray is a solid-state deposition technique that improves the performance of part surfaces. Most scholars use the CEL framework to simulate the deposition of single particles on the substrate; Single particle depositions cannot fully characterize coating conditions. This article proposes to use the CEL method to simulate the deposition process of cold spray multi-particles on the Al6061 substrate. A multi-particle wrapped model is nested in a deposition model created by CEL to simulate the cold spray multi-particle deposition process. The Euler-Lagrangian method has the characteristics of high accuracy and robustness, and was selected as the method for multi-particle deposition model simulation; The CEL framework is a feasible method to simulate the actual cold spray multi-particle deposition process. The results show that the CEL framework can simulate the deposition of cold sprayed Al6061 multi-particles on the Al6061 substrate, observe the EVF Void value of the coating, and monitor the porosity of the coating after deposition. It is observed that the maximum substrate surface temperature after deposition is 528.2K and is located at the junction of particle and particle impact; By analyzing the temperature change curve of five points collected on the substrate over time, the curve appears multiple inflection points, indicating that heat transfer occurs between the particles and the substrate during the deposition process; the substrate first heats up and then cools down. During the multi-deposition process, the particles undergo plastic deformation and continuously squeeze the coating, thereby achieving interconnection between the particles and the substrate; Mechanical interlocking between particles forms a coating.
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Phuong, Nguyen Lu, Nguyen Dang Khoa, and Kazuhide Ito. "Comparative numerical simulation of inhaled particle dispersion in upper human airway to analyse intersubject differences." Indoor and Built Environment 29, no. 6 (January 8, 2020): 793–809. http://dx.doi.org/10.1177/1420326x19894128.

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This study predicted the total and regional deposition of particles in realistic upper human airways and demonstrated the effects of intersubject variations in deposition fraction. Two airway models were studied under flow rates ranging from 0.45 to 2.4 m3/h and particle aerodynamic diameters from 1 to 10 μm. The total deposition predictions were validated using in vivo and in vitro experimental data. The intricate airway structures generated heterogeneities of airflow distributions and corresponding particle dispersions and depositions in the models. Nevertheless, with modified inertial parameters, the total deposition fraction curves of the two human upper airway models, as functions of flow rates, converged to a single function. However, regional particle deposition fractions differed significantly among the two models. The surface pressure and wall-shear stress distribution were investigated to assess the relationship of surface pressure and wall-shear stress with hotspot locations in upper airways of both models. For one subject (model A), the central nasal passage regions were found to be sites of higher deposition over the range of particle sizes and flow rates targeted in this study. For the other subject (model B), higher deposition was mostly observed in the vestibule region, caused due to particle inertia as the airway consisted of curvatures. The accelerated flow regions acted as a natural filter to high inertial particles. The results indicated that both total and regional depositions exhibited significant intersubject differences.
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Li, Debo, Qisheng Xu, Yaming Liu, Yin Libao, and Jin Jun. "Numerical Simulation of Particles Deposition in a Human Upper Airway." Advances in Mechanical Engineering 6 (January 1, 2014): 207938. http://dx.doi.org/10.1155/2014/207938.

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Based on the CT scanned images, a realistic geometric model from nasal cavity to upper six-generation bronchia is rebuilt. In order to effectively simulate the particle movement and deposition, LES model is used and the particles are tracked in the frame of Lagrange. Seven kinds of typical particles, including micron particles (1, 5, and 10 μm) and nanoparticles (1, 5, 20, and 100 nm), and three representative respiratory intensities are adopted as computational case, respectively. Deposition efficiency ( D E), deposition concentration ( D C), and capture efficiency ( C E) are introduced. Furthermore, the locations of particle deposition are visualized. The results indicate that the injecting particles from different nasal inlet present “transposition effect.”The D E values of micron particles are much higher than nanoparticles. The particle diameter plays a weaker role in nanoparticle depositions than micron particles. The highest values of D E and D C both occur in nasal cavity, while the highest C E up to 99.5% occurs in bronchus region.
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Lu, Hao, and Li-zhi Zhang. "Particle Deposition Characteristics and Efficiency in Duct Air Flow over a Backward-Facing Step: Analysis of Influencing Factors." Sustainability 11, no. 3 (January 31, 2019): 751. http://dx.doi.org/10.3390/su11030751.

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Dry deposition of airborne particles in duct air flow over a backward-facing step (BFS) is commonly encountered in built environments and energy engineering. However, the understanding of particle deposition characteristics in BFS flow remains insufficient. Thus, this study investigated particle deposition behaviors and efficiency in BFS flow by using the Reynolds stress model and the discrete particle model. The influences of flow velocities, particle diameters, and duct expansion ratios on particle deposition characteristics were examined and analyzed. After numerical validation, particle deposition velocities, deposition efficiency, and deposition mechanisms in BFS duct flow were investigated in detail. The results showed that deposition velocity in BFS duct flow monotonically increases when particle diameter increases. Moreover, deposition velocity falls with increasing expansion ratio but rises with increasing air velocity. Deposition efficiency, the ratio of deposition velocity, and flow drag in a BFS duct is higher for small particles but lower for large particles as compared with a uniform duct. A higher particle deposition efficiency can be achieved by BFS with a smaller expansion ratio. The peak deposition efficiency can reach 33.6 times higher for 1-μm particles when the BFS expansion ratio is 4:3. Moreover, the “particle free zone” occurs for 50-μm particles in the BFS duct and is enlarged when the duct expansion ratio increases.
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Li, Yuan, and Yue Qiu. "Co-Deposition of Binary Particles during Slip Casting Process." Advanced Materials Research 189-193 (February 2011): 2917–20. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.2917.

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Co-deposition of silicon carbide particles and carbon (or carbon sources) particles is essential for preparation of reaction bonded silicon carbide (RBSC) products by slip casting. The way of co-depositing of silicon carbide particles and carbon particles during slip casting process, and the influence of composition of raw particles on particle co-depositing in green bodies were studied. The experiment results show: 1.Co-deposition of binary particles is greatly affected by particle size distribution, and large proportion of rigid SiC particles increases the difficulty in demoulding procedure because of small shrinkage; 2. Dispersants in deposited cake trend to enrich at the surface in contact with mould wall, while this enrichment of dispersant has little effect on mechanical performance of RBSC products; 3. Sharp edges on surface of raw particles could result to friction among particles, which afford strength to green bodies but prevent particles packing more closely.
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Kim, S., S. H. Cho, and H. Park. "Effects of particle size distribution on the cake formation in crossflow microfiltration." Water Supply 2, no. 2 (April 1, 2002): 305–11. http://dx.doi.org/10.2166/ws.2002.0077.

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In crossflow microfiltration, the tendency of particle deposition of polydisperse suspensions has been established experimentally and compared with that of monodisperse suspensions. The mass transfers of particles are different according to size in polydisperse suspensions. The most particles, which deposit to membrane surface without clogging pore in microfiltration, are much larger than 0.1 μm. Among these particles, smaller particles are easier to deposit than larger particles because of shear-induced diffusion and particle deposition depends on the size distribution of small particles. Effective particle diameter is introduced as a representative particle size which can reflect the diffusivity of each particle according to size and it describes the tendency of particle deposition very well in polydisperse suspensions. The effect of effective particle diameter is larger than that of feed concentration. The most important factor affecting particle deposition of polydisperse suspensions is effective particle diameter. The results of our research suggest that the effective particle diameter can be an important factor which can represent the potential for cake formation.
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Iwaoka, Kazuki, Masahiro Hosoda, Shinji Tokonami, Eliza B. Enriquez, Lorna Jean H. Palad, and Reiko Kanda. "DEVELOPMENT OF CALCULATION TOOL FOR RESPIRATORY TRACT DEPOSITION DEPENDING ON AEROSOLS PARTICLE DISTRIBUTION." Radiation Protection Dosimetry 184, no. 3-4 (April 26, 2019): 388–90. http://dx.doi.org/10.1093/rpd/ncz074.

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Abstract Inhalation exposures occur by inhaled radioactive nuclides depositing in the various locations in the respiratory tract (International Commission on Radiological Protection Publication 66). Respiratory tract deposition depends on particle size. The sensitivity to ionising radiation is different among respiratory regions. Under actual atmospheric environments, the radionuclides attach to aerosols of various size in the atmosphere, so the particle size of radionuclides changes differently. Therefore, it is important for the estimation of health impact to calculate the respiratory tract deposition under atmospheric environment wherein the various sizes of radioactive nuclides (i.e. polydisperse particles) exists. In this study, a tool which can calculate the respiratory tract deposition on the basis of polydisperse particle size distribution was developed to estimate dose depending on variable aerosol particle sizes.
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Lu, Hao, Yu Wang, Hongchang Li, and Wenjun Zhao. "Numerical Simulation of Turbulent Structure and Particle Deposition in a Three-Dimensional Heat Transfer Pipe with Corrugation." Energies 17, no. 2 (January 9, 2024): 321. http://dx.doi.org/10.3390/en17020321.

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When colloidal particles are deposited in a heat transfer channel, they increase the flow resistance in the channel, resulting in a substantial decrease in heat transfer efficiency. It is critical to have a comprehensive understanding of particle properties in heat transfer channels for practical engineering applications. This study employed the Reynolds stress model (RSM) and the discrete particle model (DPM) to simulate particle deposition in a 3D corrugated rough-walled channel. The turbulent diffusion of particles was modeled with the discrete random walk model (DRW). A user-defined function (UDF) was created for particle–wall contact, and an improved particle bounce deposition model was implemented. The research focused on investigating secondary flow near the corrugated wall, Q-value standards, turbulent kinetic energy distribution, and particle deposition through validation of velocity in the tube and particle deposition modeling. The study analyzed the impact of airflow velocity, particle size, corrugation height, and corrugation period on particle deposition efficiency. The findings suggest that the use of corrugated walls can significantly improve the efficiency of deposition for particles less than 20 μm in size. Specifically, particles with a diameter of 3 μm showed five times higher efficacy of deposition with a corrugation height of 24 mm compared to a smooth surface.
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Lu, Hao, and Lin Lu. "Investigation of particle deposition efficiency enhancement in turbulent duct air flow by surface ribs with hybrid-size ribs." Indoor and Built Environment 26, no. 5 (August 4, 2016): 608–20. http://dx.doi.org/10.1177/1420326x16662509.

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This study presents the particle deposition enhancement by hybrid-size and same-size surface ribs in turbulent air duct flows using computational fluid dynamics simulation. The Reynolds stress turbulence model with UDF corrections and discrete particle model were adopted to simulate the turbulent air flow fields and particle deposition behaviours, respectively. After numerical validation with the relative literature results, pure particle deposition enhancement ratios, flow drag increase, comprehensive deposition efficiency and deposition enhancement mechanisms were investigated and discussed in details. The findings showed that the hybrid-size ribs with small rib spacing have the best enhancement performance on particle deposition for small particles ([Formula: see text]). Considering the flow drag increase, the maximum deposition efficiency can reach 485 for 1 µm particles for the hybrid-size ribbed cases, while it is just 425 for the same-size ribbed case. Nevertheless, no obvious particle deposition enhancement can be found for large particles ([Formula: see text]) for all types of surface ribs. The hybrid-size surface ribs are more efficient compared with the same-size ribs, which can be applied in the air cleaning equipment to improve the aerosol particle removal performance.
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Niu, Chenchen, Zhen Zhou, Jia Qi, and Xu Yang. "Two-Parameter Probabilistic Model and Experimental Research on Micron Particle Deposition." Applied Sciences 14, no. 14 (July 17, 2024): 6200. http://dx.doi.org/10.3390/app14146200.

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The deposition of micron particles in gas pipelines has always been an important problem in ultra-clean ventilation technology in the modern laser fusion, precision electronics, aerospace, and biomedical fields. Combining the mathematical expression of the migration, collision, and deposition of micron particles in a gas pipeline with a simulation of flow fields, a two-parameter particle probability deposition model based on vinl, θcr and collision probability coefficient PP is established, and the distribution law of particle deposition, considering two deposition targets of the pipe wall and deposition layer, is given. Combined with an experiment on particle migration and deposition in a gas pipeline, an interpretation and verification of the particle deposition distribution law are given, and the difference between the model and experiment is discussed through particle deposition efficiency mass distribution. Studies have shown the following: Under the premise of two kinds of deposition targets, different particle sizes in the gas pipeline present different deposition laws; the deposit morphology is a spot deposit of 10 µm particles and a flake deposit of 40 µm particles; the deposit position shows a uniform distribution and a lower wall dominance; and the deposit concentration area of 40 µm shows a more significant distribution. The results are very important for the selection and optimization of gas pipelines for clean spaces.
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Dissertations / Theses on the topic "Particle deposition"

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Leeming, Angus David. "Particle deposition from turbulent flows." Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242996.

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Goerg, Kristin A. "A Study of fume particle deposition." Diss., Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/5570.

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Götz, Christian Walter. "Gas-particle partitioning and particle-bound deposition of semivolatile organic chemicals /." Zürich : ETH, 2007. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17506.

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Xie, Jing. "Simulation of cold spray particle deposition process." Thesis, Lyon, INSA, 2014. http://www.theses.fr/2014ISAL0044/document.

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La projection à froid est une technologie en plein essor pour le dépôt de matériaux à l'état solide. Le procédé de dépôt des particules par pulvérisation à froid est simulé par la modélisation de l'impact à haute vitesse de particules sphériques sur un substrat plat dans diverses conditions. Pour la première fois, nous proposons une approche numérique par couplage Euler-Lagrange (CEL) afin de résoudre ce problème à haute vitesse de déformation. Les capacités de l'approche numérique CEL pour la modélisation du processus de dépôt de projection à froid sont évaluées par une étude paramétrique de : la vitesse d'impact, la température initiale des particules, le coefficient de frottement et le choix des matériaux. Les résultats de la simulation à l'aide de l'approche numérique CEL sont en accord avec les résultats expérimentaux publiés dans la littérature. La méthode CEL est généralement plus précise et plus robuste dans des régimes de déformations élevées. Un nouveau modèle d'empilement de type CFC, inspiré de la structure cristalline, est construit afin d'étudier le taux de porosité des particules déposées et les contraintes résiduelles dans le matériau de substrat pour diverses conditions. Nous pouvons observer non seulement la géométrie 3D de porosités, mais aussi leur répartition et leur évolution pendant les impacts successifs. Pour les particules, une vitesse d'impact et une température initiale élevées, sont des avantages pour produire des revêtements denses par projection à froid. Des contraintes résiduelles de compression existent à l'interface entre les particules et le substrat. Ces dernières sont causées par les grandes amplitudes et vitesses de déformation plastique induites par le procédé. Un second modèle moins complexe pour la modélisation de l'impact multiple oblique a été créé afin de simuler l'érosion de surface. Une forte érosion de surface est le résultat : d'une plus grande vitesse d'impact, d'un coefficient de frottement élevé et d'un angle de contact réduite. Pour un matériau ductile comme le cuivre, il y a deux modes de rupture : le mode 1 de traction et le mode 2 de rupture par cisaillement. Le premier survient principalement en dessous de la surface du substrat et à la périphérie de impacts, tandis que le second intervient de manière prédominante à la surface des impacts. On observe quatre étapes lors de la propagation des fissures : la formation de porosités, de fissures, la croissance de ces dernières, puis une dernière étape de coalescence et rupture. Un critère simple, où la vitesse d'érosion est fonction de l'angle de contact et de la vitesse critique d'érosion lors d'un impact de vitesse normale , est proposé sur la base des résultats des simulations afin de prédire l'initiation de l'endommagement. La déformation plastique équivalente est également un paramètre clef pour identifier l'initiation de l'endommagement, une valeur critique de 1,042 a été trouvée dans notre étude pour le cuivre
Cold spray is a rapidly developing coating technology for depositing materials in the solid state. The cold spray particle deposition process was simulated by modeling the high velocity impacts of spherical particles onto a flat substrate under various conditions. We, for the first time, proposed the Couple Eulerian Lagrangian (CEL) numerical approach to solve the high strain rate deformation problem. The capability of the CEL numerical approach in modeling the Cold Spray deposition process was verified through a systematic parameter study, including impact velocity, initial particle temperature, friction coefficient and materials combination. The simulation results by using the CEL numerical approach agree with the experimental results published in the literature. Comparing with other numerical approaches, which are Lagrangian, ALE and SPH, the CEL analyses are generally more accurate and more robust in higher deformation regimes. Besides simulating the single particle impact problem, we also extended our study into the simulation of multiple impacts. A FCC-like particles arrangement model that inspired by the crystal structure was built to investigate the porosity rate and residual stress of deposited particles under various conditions. We observed not only the 3D profiles of voids, but also their distributions and developments during different procedures. Higher impact velocity and higher initial temperature of particles are both of benefit to produce a denser cold spray coating. The compressive residual stresses existed in the interface between the particle and substrate is mainly caused by the large and fast plastic deformation. Another simplified model for multiple impacts was created for the simulation of surface erosion. A severe surface erosion is the result of a high impact velocity, a high friction coefficient and a low contact angle. Two element failure models suitable for high-strain-rate dynamic problems were introduced in this study. For a ductile material as Copper, it followed two fracture modes in our study, which are tensile failure mode and shear failure mode. The former one mainly occurred beneath the substrate surface and the periphery of substrate craters, nevertheless the latter one was found predominately at the surface of craters. Four steps were found during the propagation of crack: void formation; crack formation; crack growth; coalescence and failure. A simple criterion equation was derived based on the simulation results for predicting the initiation of damage, which the erosion velocity v_{ero} is a function of contact angle and erosion velocity for normal impact v_{pi/2}. The equivalent plastic strain could also be a parameter for identifying the onset of damage, identified as being 1.042 for Copper in our study
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Naseri, Mojghan. "Effect of particle impact velocity on carryover deposition." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape3/PQDD_0021/MQ53345.pdf.

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Fries, Jerry Stephen 1972. "Enhancement of fine particle deposition to permeable sediments." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/29054.

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Thesis (Ph. D.)--Joint Program in Oceanography (Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, and the Woods Hole Oceanographic Institution), 2002.
Includes bibliographical references (leaves 137-143).
Predictions of deposition rate are integral to the transport of many constituents including contaminants, organic matter, and larvae. Review of the literature demonstrates a general appreciation for the potential control of deposition by bed roughness, but no direct tests involving flat sediment beds. Understanding the mechanisms at work for flat sediment beds would provide the basis for exploring more complicated bed conditions and the incorporation of other transport processes, such as bioturbation and bedload transport. Generally, fine particle deposition rates are assumed to be equivalent to the suspension settling velocity, therefore, deposition rates in excess of settling are considered enhanced. Flume observations of deposition were made using treatments that covered a wide range of flow, particle, and bed conditions. Specific treatments demonstrated large enhancements (up to eight times settling). Delivery of particles to the interface is important, but models based on delivery alone failed to predict the observed enhancement. This necessitated the development of a new model based on a balance between delivery and filtration in the bed. Interfacial diffusion was chosen as a model for particle delivery. Filtration of particles by the bed is a useful framework for retention, but the shear in the interstitial flow may introduce additional factors not included in traditional filtration experiments.
(cont.) The model performed well in prediction of flow conditions, but there remained a discrepancy between predictions and observed deposition rate, especially for treatments with significant enhancement. Fluid flow predictions by the model, such as slip at the sediment water interface and fluid penetration into the sediment, appeared to be supported by flume experiments. Therefore, failure to predict the magnitude of enhancement was attributed to far greater filtration efficiencies for the sediment water interface than those measured in sediment columns. Emerging techniques to directly measure fluid and particle motion at the interface could reveal these mechanisms. The observation of enhanced deposition to flat sediment beds reinforces the importance of permeable sediments to the mediation of transport from the water column to the sediment bed.
by Jerry Stephen Fries.
Ph.D.
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Forsyth, Peter. "High temperature particle deposition with gas turbine applications." Thesis, University of Oxford, 2017. http://ora.ox.ac.uk/objects/uuid:61556237-feed-43cb-9f4a-d0aed00ca3f8.

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This thesis describes validated improvements in the modelling of micron-sized particle deposition within gas turbine engine secondary air systems. The initial aim of the research was to employ appropriate models of instantaneous turbulent flow behaviour to RANS CFD simulations, allowing the trajectory of solid particulates in the flow to be accurately predicted. Following critical assessment of turbophoretic models, the continuous random walk (CRW) model was chosen to predict instantaneous fluid fluctuating velocities. Particle flow, characterised by non-dimensional deposition velocity and particle relaxation time, was observed to match published experimental vertical pipe flow data. This was possible due to redefining the integration time step in terms of Kolmagorov and Lagrangian time scales, reducing the disparity between simulations and experimental data by an order of magnitude. As no high temperature validation data for the CRW model were available, an experimental rig was developed to conduct horizontal pipe flow experiments under engine realistic conditions. Both the experimental rig, and a new particulate concentration measurement technique, based on post test aqueous solution electrical conductivity, were qualified at ambient conditions. These new experimental data compare well to published data at non-dimensional particle relaxation times below 7. Above, a tail off in the deposition rate is observed, potentially caused by a bounce or shear removal mechanism at higher particle kinetic energy. At elevated temperatures and isothermal conditions, similar behaviour is observed to the ambient data. Under engine representative thermophoretic conditions, a negative gas to wall temperature gradient is seen to increase deposition by up to 4.8 times, the reverse decreasing deposition by a factor of up to 560 relative to the isothermal data. Numerical simulations using the CRW model under-predict isothermal deposition, though capturing relative thermophoretic effects well. By applying an anisotropic Lagrangian time scale, and cross trajectory effects of the external gravitational force, good agreement was observed, the first inclusion of the effect within the CRW model. A dynamic mesh morphing method was then developed, enabling the effect of large scale particle deposition to be included in simulations, without continual remeshing of the fluid domain. Simulation of an impingement jet array showed deposition of characteristic mounds up to 30% of the hole diameter in height. Simulation of a passage with film-cooling hole off-takes generated hole blockage of up to 40%. These cases confirmed that the use of the CRW generated deposition locations in line with scant available experimental data, but widespread airline fleet experience. Changing rates of deposition were observed with the evolution of the deposits in both cases, highlighting the importance of capturing changing passage geometry through dynamic mesh morphing. The level of deposition observed, was however, greater than expected in a real engine environment and identifies a need to further refine bounce-stick and erosion modelling to complement the improved prediction of impact location identified in this thesis.
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Theerachaisupakij, Woraporn. "Particle-layer formation in aerosol flow by simultaneous deposition and reentrainment of fine particles." 京都大学 (Kyoto University), 2002. http://hdl.handle.net/2433/149824.

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Lyyränen, Jussi. "Particle formation, deposition, and particle induced corrosion in large-scale medium-speed diesel engines /." Espoo VTT, 2006. http://www.vtt.fi/inf/pdf/publications/2006/P598.pdf.

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Chari, Geethanjali. "Enhanced submicron particle deposition using thermophoresis and roughness elements." Thesis, Imperial College London, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.428552.

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Books on the topic "Particle deposition"

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(Firm), Knovel, ed. Particle deposition and aggregation: Measurement, modelling, and simulation. [Oxford England]: Butterworth-Heinemann, 1998.

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Fries, Jerry Stephen. Enhancement of fine particle deposition to permeable sediments. Cambridge, Mass: Massachusetts Institute of Technology, 2002.

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Naseri, Mojghan. Effect of particle impact velocity on carryover deposition. Ottawa: National Library of Canada, 2000.

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Aitken, R. J. Large particle and wall deposition effects in inhalable samplers. [Sudbury]: HSE Books, 1996.

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Lyyränen, Jussi. Particle formation, deposition, and particle induced corrosion in large-scale medium-speed diesel engines. [Espoo, Finland]: VTT Technical Research Centre of Finland, 2006.

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Mittal, K. L., and Rajiv Kohli. Developments in surface contamination and cleaning: Particle deposition, control and removal. Amsterdam: Elsevier/William Andrew, 2010.

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Leonard, Stockburger, and Atmospheric Research and Exposure Assessment Laboratory (U.S.), eds. A regional fine particle field study: Data base and initial results : project summary. Research Triangle Park, NC: U.S. Environmental Protection Agency, Atmospheric Research and Exposure Assessment Laboroatory, 1991.

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Turner, C. W. Modelling magnetite particle deposition in nuclear steam generators and comparisons with plant data. Chalk River, Ont: Chalk River Laboratories, 1994.

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Yung, Bruce Pak Keung. Particle deposition and re-entrainment in relation to the hydrodynamics at a surface. Birmingham: University of Birmingham, 1986.

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R, McFarland Andrew, U.S. Nuclear Regulatory Commission. Office of Nuclear Regulatory Research. Division of Regulatory Applications., and Texas A & M University. Dept. of Mechanical Engineering., eds. DEPOSITION, software to calculate particle penetration through aerosol transport lines: Draft report for comment. Washington, DC: Division of Regulatory Applications, Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission, 1991.

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Book chapters on the topic "Particle deposition"

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Adamczyk, Zbigniew, and Malgorzata Nattich-Rak. "Particle Deposition." In Encyclopedia of Colloid and Interface Science, 868–910. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-20665-8_126.

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Adachi, Motoaki, and Kikuo Okuyama. "Particle Deposition in Air." In Ultraclean Surface Processing of Silicon Wafers, 67–81. Berlin, Heidelberg: Springer Berlin Heidelberg, 1998. http://dx.doi.org/10.1007/978-3-662-03535-1_6.

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Adachi, Motoaki, and Kikuo Okuyama. "Particle Deposition in Plasma." In Ultraclean Surface Processing of Silicon Wafers, 82–91. Berlin, Heidelberg: Springer Berlin Heidelberg, 1998. http://dx.doi.org/10.1007/978-3-662-03535-1_7.

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Kodama, Tetsuro. "Particle Deposition in Vacuum." In Ultraclean Surface Processing of Silicon Wafers, 92–104. Berlin, Heidelberg: Springer Berlin Heidelberg, 1998. http://dx.doi.org/10.1007/978-3-662-03535-1_8.

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Shimada, Manabu, Shuji Matsusaka, and Hiroaki Masuda. "Particle Deposition and Reentrainment." In Powder Technology Handbook, 121–27. Fourth edition. | Boca Raton, FL : Taylor & Francis Group, LLC, 2020.: CRC Press, 2019. http://dx.doi.org/10.1201/b22268-17.

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Messenger, George C., and Milton S. Ash. "Particle Penetration and Energy Deposition." In Single Event Phenomena, 61–87. Boston, MA: Springer US, 1997. http://dx.doi.org/10.1007/978-1-4615-6043-2_3.

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Minier, Jean-Pierre. "A General Introduction to Particle Deposition." In Particles in Wall-Bounded Turbulent Flows: Deposition, Re-Suspension and Agglomeration, 1–36. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-41567-3_1.

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A. Aziz, Nurhanani, M. H. Zawawi, N. M. Zahari, Aizat Mazlan, Aizat Abas, Aqil Azman, and Muhammad Naqib Nashrudin. "Particle Deposition Analysis Using DPM-DEM." In Lecture Notes in Civil Engineering, 433–43. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-5543-2_35.

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Semleit, D., A. Trampe, and H. Fissan. "Development of a particle deposition meter." In Particles on Surfaces: Detection, Adhesion and Removal, Volume 7, 27–40. London: CRC Press, 2023. http://dx.doi.org/10.1201/9780429070716-4.

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Li, K. Q., G. C. Gong, and S. H. Zou. "Simulation of Indoor Fine Suspension Particle Deposition." In New Trends in Fluid Mechanics Research, 599. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-75995-9_199.

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Conference papers on the topic "Particle deposition"

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Yap, Y. F., F. M. Vargas, and J. C. Chai. "A Level-Set Method for Multi-Species Particle Deposition." In ASME 2013 Heat Transfer Summer Conference collocated with the ASME 2013 7th International Conference on Energy Sustainability and the ASME 2013 11th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/ht2013-17130.

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Often in a general deposition process, there exist multiple species particle depositing simultaneously. These species particles is different from each other both chemically and physically. Prediction of these processes requires separate treatment for each species. This article presents a level-set formulation for multi-species particle deposition where each species particles depositing with its respective deposition reaction order. The approach is verified via a one-dimensional multi-species deposition and the limiting case of one-species deposition. Applications of the framework to multi-species particle deposition in a square enclosure, a channel with flowing fluid and a lid-driven cavity are then demonstrated.
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Jubery, Talukder Z., Shiv G. Kapoor, and John E. Wentz. "Effect of Inter-Particle Interaction on Particle Deposition in a Cross-Flow Microfilter." In ASME 2013 International Manufacturing Science and Engineering Conference collocated with the 41st North American Manufacturing Research Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/msec2013-1211.

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Recent studies show that inter-particle interaction can affect particle trajectories and particle deposition causing fouling in the microfilters used for metal working fluids (MWFs). Inter-particle interaction depends on various factors: particle geometry and surface properties, membrane pore geometry and surface properties, MWF’s properties and system operating conditions, etc. A mathematical model with a Langevin equation for particle trajectory and a hard sphere model for particle deposition has been used to study the effect of particle’s size, particle’s surface zeta potential, inter-particle distance, and shape of membrane pore wall surface on particle trajectory and its deposition on membrane pore wall. The study reveals that bigger particles have a lesser tendency to be deposited on membrane pore walls than smaller particles. The shape of the membrane pore wall surface can also affect the particle deposition behavior.
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Chen, Jim S., and Jinho Kim. "Micro Particle Transport and Deposition in Human Upper Airways." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-42928.

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The hazard caused by inhaled particles depends on the site at which they deposit within the respiratory system. Knowledge of respiratory aerosol deposition rates and locations is necessary to (1) evaluate potential health effects and establish critical exposure limits and (2) design effective inhaled medications that target specific lung regions. Particles smaller than 10 μm in diameter can be breathed into lungs and are known as inhalable particles, while most of larger particles settle in mouth and nose. Inhalable particles settle in different regions of the lungs and the settling regions depends on the particle size. The motion of a particle is mainly affected by the inertia of the particle and by the particle’s aerodynamic drag. The most important dimensionless parameters in the prediction of particle motion are the flow Reynolds number and the Stoke number, which combines the effects of particle diameter, particle density, shape factor and slip factor. The purpose of this study is to investigate the airflows in human respiratory airways. The influence of particle size on transport and deposition patterns in the 3-D lung model of the human airways is the primary concern of this research. The lung model developed for this research extends from the trachea to the segmental bronchi and it is based on Weibel’s model. The velocity field of air is studied and particle transport and deposition are compared for particles in the diameter range of 1 μm – 100 μm (G0 to G2) and 0.1 μm – 10 μm (G3 to G5) at airflow rates of 6.0, 16.7, and 30.0 L/min, which represent breathing at rest, light activity, and heavy activity, respectively. The investigation is carried out by computational fluid dynamics (CFD) using the software Fluent 6.2. Three-dimensional, steady, incompressible, laminar flow is simulated to obtain the flow field. The discrete phase model (DPM) is then employed to predict the particle trajectories and the deposition efficiency by considering drag and gravity forces. In the present study, the Reynolds number in the range of 200 – 2000 and the Stoke number in the range of 10−5 – 0.12 are investigated. For particle size over 10 μm, deposition mainly occurs by inertial impaction, where deposition generally increases with increases in particle size and flow rate. Most of the larger micron sized particles are captured at the bifurcations, while submicron sized particles flow with the fluid into the lung lower airways. The trajectories of submicron sized particles are strongly influenced by the secondary flow in daughter branches. The present results of particle deposition efficiency in the human upper airways compared well with data in the literature.
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Tian, L., G. Ahmadi, P. K. Hopke, and Y. S. Cheng. "Flow and Particle Deposition in Asymmetric Human Airways." In ASME 2006 2nd Joint U.S.-European Fluids Engineering Summer Meeting Collocated With the 14th International Conference on Nuclear Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/fedsm2006-98198.

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Transport and deposition of particles in human upper thoracic airways is important to understand their toxicology and the effect of exposure to environmental particulate matter as well as in the design of inhalation drug delivery devices. In the past, limited studies have employed 3-D asymmetric models to study the airflow through human lung, although tracheobronchial branching is generally asymmetric. Also limited work has been devoted to the study of particle deposition in upper airways where turbulence is important to particle depositions. It is also known that the asymmetry of the airways has a profound effect on the airflow fields and particle transport and deposition. The present study is concerned with providing a more accurate computational model for lung deposition. A realistic 3-D asymmetric bifurcation representation of human upper tracheobronchial tree has been developed to simulate the airflow field characterizing the inspiratory flow conditions using a turbulence Reynolds stress transport model. A Lagrangian particle trajectory analysis was also used for analyzing particle transport and deposition patterns in the upper tracheobronchial tree.
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Dicuangco, Mercy, Susmita Dash, Justin A. Weibel, and Suresh V. Garimella. "Evaporative Particle Deposition on Superhydrophobic Surfaces." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-63928.

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The ability to control the size, shape, and location of particulate deposits is important in patterning, nanowire growth, sorting biological samples, and many other industrial and scientific applications. It is therefore of interest to understand the fundamentals of particle deposition via droplet evaporation. In the present study, we experimentally probe the assembly of particles on superhydrophobic surfaces by the evaporation of sessile water droplets containing suspended latex particles. Superhydrophobic surfaces are known to result in a significant decrease in the solid-liquid contact area of a droplet placed on such a substrate, thereby increasing the droplet contact angle and reducing the contact angle hysteresis. We conduct experiments on superhydrophobic surfaces of different geometric parameters that are maintained at different surface temperatures. The transient droplet shape and wetting behavior during evaporation are analyzed as a function of substrate temperature as well as surface morphology. During the evaporation process, the droplet exhibits a constant contact radius mode, a constant contact angle mode, or a mixed mode in which the contact angle and contact radius change simultaneously. The evaporation time of a droplet can be significantly reduced with substrate heating as compared to room-temperature evaporation. To describe the spatial distribution of the particle residues left on the surfaces, qualitative and quantitative evaluations of the deposits are presented. The results show that droplet evaporation on superhydrophobic surfaces, driven by mass diffusion under isothermal conditions or by substrate heating, suppresses particle deposition at the contact line. This preempts the so-called coffee-ring and allows active control of the location of particle deposition.
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Abuzeid, Salem, and Ahmed A. Busnaina. "Simulation of Submicron Particle Deposition in Laminar and Turbulent Stagnation Point Flows." In ASME 1991 International Computers in Engineering Conference and Exposition. American Society of Mechanical Engineers, 1991. http://dx.doi.org/10.1115/cie1991-0070.

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Abstract The two dimensional laminar and turbulence stagnation-point flow over a wafer surface within a cleanroom environment are numerically simulated. This study shows the relationship between particle capture area on the wafer and the particle size and flow conditions. The mean flow field is simulated using a two equation k-ϵ turbulence model. Trajectories of aerosol particles are evaluated by solving the corresponding Lagrangian equation of motion that includes effects of drag, gravity, lift force, Brownian motion and turbulence fluctuations. The Brownian motion is modeled as a white noise process and turbulence fluctuation is assumed to behave as Gaussian random process. Simulations are carried out for aerosol particles (of various sizes) released at different locations over the surface. Depositions of particles on the wall are evaluated and a capture area which varies with particle sizes is produced. The results show that Brownian motion becomes very significant when turbulence fluctuations start to disappear near the wall for particles smaller than 1 μm in diameter. The results also show that, deposition of particles in turbulent flows are usually higher than that in laminar flows for all particle sizes considered. The effect of fluid on particle deposition rate is predicted for fluid of air and water. The results show that, particles deposition rate in air is higher than that in water.
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Hsu, Kwen, Brett Barker, Bruce Varney, Andrew Boulanger, Vy Nguyen, and Wing F. Ng. "Review of Heated Sand Particle Deposition Models." In ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/gt2018-75723.

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Sand & dust ingestion is a critical issue for aero engines as the particles can deposit on surfaces in the hot sections of the engine. These deposits can block cooling holes, damage to components and alter the gas path geometry leading to performance loss and potentially power failure. A number of sand particle deposition models have been developed in recent years with the goal of developing a predictive tool for sand deposition. These models utilize different approaches for modeling the particle-surface physics and were developed using either purely material property theories or experimental data from different sources or both. Comparing these models can be difficult due to differences in material assumptions and different test cases. In this study, a CFD simulation was conducted of the Virginia Tech Aerothermal rig experiments and some selected depositions models were applied. The results were compared to each other and the rig results so that their accuracy, performance, and recommended improvements could be discussed.
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Abuzeid, Salem, and Ahmed A. Busnaina. "Electrostatic Effects on Submicron Particles Deposition." In ASME 1991 International Computers in Engineering Conference and Exposition. American Society of Mechanical Engineers, 1991. http://dx.doi.org/10.1115/cie1991-0078.

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Abstract Laminar air flow in a two-dimensional stagnation point flow is numerically simulated. This geometry resemble the flow of air in clean room over a clean bench. The Lagrangian equation of motion of aerosol particle that includes effects of drag, gravity, lift force, Brownian motion and electrostatic force is solved numerically. The Brownian force is simulated as a Gaussian white noise random process. Trajectories of aerosol particles in the flow are evaluated and a deposition capture area which varies with particle sizes is produced. The effects of particle diameter and surface voltage on particle capture area (deposition area) are shown. Different surface voltages of 0.0, 1.0, and 4.0 kv/cm are considered. The results show that, deposition of particles increases as the surface voltage increases for all particle sizes considered. Also, the particles which have a minimum capture area are in the range of 0.50–1.0 μm. This implies that the particles which have a minimum deposition rate are in that range.
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Jiang, Lei-Yong, Patrick Trembath, Prakash Patnaik, and Michele Capurro. "Particle Rebound/Deposition Modelling in Engine Hot Sections." In ASME Turbo Expo 2022: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/gt2022-80013.

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Abstract The current state of the art in experimental and analytical research on environmental particle ingestion related to engine hot sections was reviewed, with greater emphasis focussed on sand particles. From these efforts, the available experimental data for model calibration were identified, and a particle rebound/deposition model has been developed. A semi-empirical approach is selected to model sand particles bouncing off metal surfaces, where the coefficients of restitution measured in a temperature range of 297–1323 K from Delimont et al are used to calculate particle bounce-back velocity components. The developed deposition model is based on non-dimensional parameters and the analysis over more than seventy experimental datasets related to particle deposition in engine hot sections carried out by Suman et al. Moreover, the metal surface temperature, one of two critical parameters in particle deposition, is also included in the model. The developed rebound/deposition model was successfully implemented into the ANSYS CFD Premium solver and checked step by step. The model is calibrated by two cases: sand [or Arizona road dust (ARD)] particle impingement on a circular plate and Mt. St. Helens volcanic ash (comparable with ARD particles in terms of chemical composition) impinging on a first-stage air-cooled nozzle guide vane (NGV). For the former case, the calibrated model predicts fairly well the variation of particle capture efficiencies with flow/particle temperatures. The latter case indicates that the particle capture efficiency at engine operating conditions can be assessed by the developed model. Due to the lack of experimental data that would permit a full calibration/validation, for the time being it could be only used under limited conditions. Certainly, the model will be continuously improved as the relevant experimental data appears.
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Lesniewski, Thomas K. "Particle deposition in confined vessels." In SPIE Optics + Photonics, edited by O. Manuel Uy, Sharon A. Straka, John C. Fleming, and Michael G. Dittman. SPIE, 2006. http://dx.doi.org/10.1117/12.674657.

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Reports on the topic "Particle deposition"

1

Sippola, Mark Raymond. Particle deposition in ventilation ducts. Office of Scientific and Technical Information (OSTI), September 2002. http://dx.doi.org/10.2172/810494.

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Tien, C. Particle Deposition in Granular Media. Office of Scientific and Technical Information (OSTI), January 1992. http://dx.doi.org/10.2172/6672557.

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Tien, Chi. Particle deposition in granular media. Office of Scientific and Technical Information (OSTI), January 1990. http://dx.doi.org/10.2172/6909361.

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Morton, D. S. Colloidal particle deposition in turbulent flow. Office of Scientific and Technical Information (OSTI), May 1994. http://dx.doi.org/10.2172/10157881.

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Tien, C. Particle Deposition in Granular Media. Final report. Office of Scientific and Technical Information (OSTI), December 1992. http://dx.doi.org/10.2172/10140326.

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Tien, Chi. Particle deposition in granular media: Progress report. Office of Scientific and Technical Information (OSTI), January 1987. http://dx.doi.org/10.2172/5524563.

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Tien, Chi. Particle deposition in granular media: Progress report. Office of Scientific and Technical Information (OSTI), January 1989. http://dx.doi.org/10.2172/5763546.

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Cohen, B. S. Particle deposition in human and canine tracheobronchial casts. Office of Scientific and Technical Information (OSTI), November 1991. http://dx.doi.org/10.2172/5309552.

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Cohen, B. S. Particle deposition in human and canine tracheobronchial casts. Office of Scientific and Technical Information (OSTI), January 1991. http://dx.doi.org/10.2172/6251234.

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Bigl, Matthew, Samuel Beal, and Charles Ramsey. Determination of residual low-order detonation particle characteristics from Composition B mortar rounds. Engineer Research and Development Center (U.S.), August 2022. http://dx.doi.org/10.21079/11681/45260.

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Empirical measurements of the spatial distribution, particle-size distribution, mass, morphology, and energetic composition of particles from low-order (LO) detonations are critical to accurately characterizing environ-mental impacts on military training ranges. This study demonstrated a method of generating and characterizing LO-detonation particles, previously applied to insensitive munitions, to 81 mm mortar rounds containing the conventional explosive formulation Composition B. The three sampled rounds had estimated detonation efficiencies ranging from 64% to 82% as measured by sampled residual energetic material. For all sampled rounds, energetic deposition rates were highest closer to the point of detonation; however, the mass per radial meter varied. The majority of particles (>60%), by mass, were <2 mm in size. However, the spatial distribution of the <2 mm particles from the point of detonation varied be-tween the three sampled rounds. In addition to the particle-size-distribution results, several method performance observations were made, including command-detonation configurations, sampling quality control, particle-shape influence on laser-diffraction particle-size analysis (LD-PSA), and energetic purity trends. Overall, this study demonstrated the successful characterization of Composition B LO-detonation particles from command detonation through combined analysis by LD-PSA and sieving.
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