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.
Full textGoerg, Kristin A. "A Study of fume particle deposition." Diss., Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/5570.
Full textGötz, 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.
Full textXie, Jing. "Simulation of cold spray particle deposition process." Thesis, Lyon, INSA, 2014. http://www.theses.fr/2014ISAL0044/document.
Full textCold 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
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.
Full textFries, Jerry Stephen 1972. "Enhancement of fine particle deposition to permeable sediments." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/29054.
Full textIncludes 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.
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.
Full textTheerachaisupakij, 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.
Full textLyyränen, 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.
Full textChari, 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.
Full textChiou, M. C. "The role of thermophoresis in sub-micron particle deposition." Thesis, University of Liverpool, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.357412.
Full textKuruneru, Sahan Trushad Wickramasooriya. "Numerical modelling of particle deposition in idealized porous channels." Thesis, Queensland University of Technology, 2015. https://eprints.qut.edu.au/90555/1/Sahan_Kuruneru_Thesis.pdf.
Full textIslam, Mohammad Saidul. "Three-dimensional modelling of particulate deposition in the human respiratory tract." Thesis, Queensland University of Technology, 2018. https://eprints.qut.edu.au/115472/1/115472_9028200_mohammad_saidul_islam_thesis.pdf.
Full textSmith, Christopher Stephen. "Experimental Validation of a Hot Gas Turbine Particle Deposition Facility." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1269547595.
Full textHaberer, Elaine D. (Elaine Denise) 1975. "Particle generation in a chemical vapor deposition/plasma-enhanced chemical vapor deposition interlayer dielectric tool." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/8992.
Full textIncludes bibliographical references (p. 77-79).
The interlayer dielectric plays an important role in multilevel integration. Material choice, processing, and contamination greatly impact the performance of the layer. In this study, particle generation, deposition, and adhesion mechanisms are reviewed. In particular, four important sources of interlayer dielectric particle contamination were investigated: the cleanroom environment, improper wafer handling, the backside of the wafer, and microarcing during process.
by Elaine D. Haberer.
S.M.
Whitaker, Steven Michael. "Informing Physics-Based Particle Deposition Models Using Novel Experimental Techniques to Evaluate Particle-Surface Interactions." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1500473579986028.
Full textCzok, Gregor Sebastian. "Particle coating by chemical vapor deposition in the fluidized bed." Berlin Pro Business, 2005. http://deposit.ddb.de/cgi-bin/dokserv?id=2689065&prov=M&dok_var=1&dok_ext=htm.
Full textNACCACHE, MONICA FEIJO. "STUDY OF PARTICLE DEPOSITION BY THERMOPHORESIS IN OPTICAL FIBER FABRICATION." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1989. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=20358@1.
Full textFUNDAÇÃO DE APOIO À PESQUISA DO ESTADO DO RIO DE JANEIRO
O presente trabalho é uma simulação numérica do processo de deposição de partículas num escoamento laminar no interior de um submetido a um aquecimento externo. A simulação tem como objetivo a modelagem do processo MCVD (Deposição Modificada de Vapor Químico), utilizado na fabricação de pré-formas para a produção de fibras óticas. Neste processo, as partículas carregadas por convenção pelo gás são depositadas na parede interna do tubo devido à força termoforética. A eficiência de deposição é obtida resolvendo-se numericamente as equações diferenciais de conservação de massa, quantidade de movimento linear, energia e espécie químicas (massa de partículas). A última equação foi resolvida utilizando o campo de velocidades calculado adicionando-se a velocidade de escoamento do gás à velocidade termoforética, obtida dos gradientes locais de temperatura. A fim de determinar os efeitos das velocidades termoforéticas axiais na deposição de partículas, as equações que governam o problema foram consideradas na forma elíptica. Os resultados apresentados revelaram que a temperatura de entrada do gás pode gerar um gradiente de temperatura axial que produz velocidades termoforéticas axiais significativas e influenciam marcantemente a eficiência de deposição de partículas.
The present work sets forth a numeriacal simulation of the processo f particle deposition in a laminar pipe flow subjected to external heating. The simulation is aimed at modeling the MCVD (Modified Chemical vapor Deposition) process utilized in the frabication or performs for optical fiver production. In this process, the particles convected with the carrier gas are deposited on the inner wall of the pipe due to thermophoretic forces. The deposition efficiency is obtained by numerically solving the differential equations governing conservation of mass, momentum, energy, and chemical species (particle concentration). The latter equation was solved utilizing a velocity field calculated by adding the carrier gas velocity to the thermophoretic velocity, obtained from the local temperature gradients. In order to assess the effects of axial thermophoretic velocities on particle deposition, the governing equations were considered in their elliptic form. The results presented revealed that the inlet which produce significant axial thermophoretic velocities and markedly influence the particle deposition efficiency.
Liebhart, Ewlad. "Particle deposition and cake formation in filters with shearing flows." Thesis, Kingston University, 2000. http://eprints.kingston.ac.uk/20654/.
Full textFor double layer interacting particles the effects of shear are noticed at an earlier stage in the filtration process as particle interactions transmit the forces exerted externally on the mixture. The overall stiffness due to shearing is then estimated (stability is here required) and it is shown that the normal stress on the medium is reduced due to the fluctuations induced by the shearing. A lattice-Boltzmann simulation of the same configuration confirms this interesting result. A crossflow setup has been analysed. A somewhat simplified one dimensional investigation is presented. The key point is that the edge of the cake near the septum is defined by the edge of stability analysis and this piece of information enables a full survey of experimental results with a wide range of process parameters (feed solidosity, crossflow velocity, crossflow pressure, particle type, pH).
Fan, Jianhua. "Numerical study of particle transport and deposition in porous media." Thesis, Rennes, INSA, 2018. http://www.theses.fr/2018ISAR0003/document.
Full textThe objective of the present research was to numerically investigate the transport and deposition of particles in porous media at the pore scale. Firstly, a developed coupled lattice Boltzmann method (LBM) and discrete element method (DEM) is used to simulate the fluid-particle flow. LBM is employed to describe the fluid flow around fibers whereas DEM is used to deal with the particle dynamics. The corresponding method is two-way coupling in the sense that particle motion affects the fluid flow and reciprocally. It allowed us to predict the capture efficiency and pressure drop at the initial stage of filtration process. The quality factor is also calculated for determining the filtration performance. Secondly, we focus on the study the capture efficiency of single fiber with circular, diamond and square cross-section, respectively. The results of LBM-DEM for filtration process of single circular fiber agree well with the empirical correlation. The impaction of particles on the front side of square-shaped fiber is more favorable than those on circular and diamond cases. However, diamond fiber exhibits a good filtration performance. Then the variations of quality factor due to the different orientation angle and aspect ratio of rectangular fiber were studied using LBM-DEM. For each case, we have found the optimal value of the windward area to which corresponds a maximum value of the quality factor. The comparison of the performance of the different forms of fibers shows that the largest quality factor is obtained for square fiber oriented with angle π/4.Finally, the influence of the arrangement of fiber on filtration performance is analyzed by considering the staggered configuration. Simulations conducted for several particle size and density show that the diamond with staggered array performs better for large particles and high particle-to-fluid density ratio in terms of quality factor. The present study provide an insight to optimize the filtration process and predict filtration performance
Ai, Jun. "Particle scale and bulk scale investigation of granular piles and silos." Thesis, University of Edinburgh, 2010. http://hdl.handle.net/1842/4616.
Full textPlewacki, Nicholas. "Modeling High Temperature Deposition in Gas Turbines." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1587714424017527.
Full textLutro, Henrik Fahre. "The Effect of Thermophoresis on the Particle Deposition on a Cylinder." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for fysikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-18489.
Full textNordlund, Markus. "Permeability modelling and particle deposition mechanisms related to advanced composites manufacturing /." Luleå : Division of Fluid Mechanics, Luleå University of Technology, 2006. http://epubl.ltu.se/1402-1544/2006/45/LTU-DT-0645-SE.pdf.
Full textKnutsen, Jeffrey Steven. "Membrane bioseparations: Cellulase recovery, particle deposition, and second osmotic virial coefficients." Diss., Connect to online resource, 2005. http://wwwlib.umi.com/dissertations/fullcit/3165833.
Full textKavanagh, Andrew John. "Energy deposition in the lower auroral ionosphere through energetic particle precipitation." Thesis, Lancaster University, 2002. http://eprints.lancs.ac.uk/6758/.
Full textDegereji, Mohammed Usman. "Predictive modelling of ash particle deposition in a PF combustion furnace." Thesis, University of Leeds, 2011. http://etheses.whiterose.ac.uk/21122/.
Full textSacco, Craig A. "The Effects of Pressure on Particle Deposition in an Impinging Flow." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1471873647.
Full textPatel, Hardik Dipan. "Experimental Investigation of Initial Onset of Sand Deposition in the Turbine Section of Gas Turbines." Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/56595.
Full textMaster of Science
Stone, Peter Michael. "The particle size selectivity of suspended sediment delivery from drainage basins." Thesis, University of Exeter, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337807.
Full textHealy, David Patrick. "On the full Lagrangian approach and thermophoretic deposition in gas-particle flows." Thesis, University of Cambridge, 2003. https://www.repository.cam.ac.uk/handle/1810/219497.
Full textSegal, Rebecca Anne. "Patterns of air flow and particle deposition in the diseased human lung." NCSU, 2001. http://www.lib.ncsu.edu/theses/available/etd-20010702-165013.
Full textSEGAL, REBECCA ANNE. Patterns of air flow and particle depositionin the diseased human lung. (Under the direction of Michael Shearer.)In this work, we investigate particle deposition and air flow in thehuman lung. In particular we are interested in how the motion ofparticulate matter and air is affected by the presence of lungdisease. Patients with compromised lung function are more sensitiveto air pollution; understanding the extent of that sensitivity canlead to more effective air quality standards. Also, understanding ofair flow andparticle trajectories could lead to the development of better aerosoldrugs to treat the lung diseases.We focus our efforts on twodiseases: chronic obstructive pulmonary disease (COPD) and bronchialtumors. Because COPD affects the majority of airways in a patientwith the disease, we are able to take a more global approach toanalyzing the effects of the disease. Using a FORTRAN codewhich computes total deposition in the lung over the course of onebreath, we modified the pre-existing code to account forthe difference between healthy subjects and patients with COPD. Usingthe model, itwas possible to isolate the different disease components of COPD andsimulate their effects separately. It was determined thatthe chronic bronchitis component of COPD was responsible for the increaseddeposition seen in COPD patients.While COPD affects the whole lung, tumors tend to belocalized to one or several airways. This led us to investigate theeffects of bronchial tumors in detail within these individualairways. Using a computational fluid dynamics package, FIDAP, wedefined a Weibel type branching network of airways.In particular, we modeled theairways of a four-year-old child.In the work with the tumors, we ran numerous simulations with variousinitial velocities and tumor locations. It was determined that tumorslocated on the carinal ridge had the dominant effect on the flow. Athigher initial velocities, areas of circulation developed downstreamfrom the tumors. Extensive simulations were run with a 2-D model. Theresults from the 2-D model were then compared with some initial 3-Dsimulations.In the development of the FIDAP model, we avoided thecomplications of flow past the larynx, by limiting the model togenerations 2-5 of the Weibel lung. We developed a realistic inletvelocity profile to be used as the input into the model. The skewednature ofthis inlet profile led to thequestion of boundary layer development and the determination of theentrance length needed to achieve fully developed parabolicflow. Simple scale analysis of the Navier-Stokes equations did notcapture the results we were seeing with the CFD simulations.We turned to a more quantitative, energy correctionanalysis to determine the theoretical entrance length.In conclusion, the presence of disease in the lunghas a large effect both on global deposition patterns and on localizedairflow patterns. This indicates the need for different protocolsregarding susceptibility of people to airborne pollutants that take intoaccount lung disease. It also suggests that treatment should accountfor changes in airflow in the diseased lung.
Schröder, Franka [Verfasser]. "Particle Deposition Driven by Vortex Pairs in the Human Lung / Franka Schröder." München : Verlag Dr. Hut, 2015. http://d-nb.info/1076437761/34.
Full textSimmons, Kathy. "An investigation into the deposition of particulate material on ceramic particle filters." Thesis, University of Nottingham, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243347.
Full textParker, Simon Toby. "An investigation into the effects of complex topography on particle dry deposition." Thesis, University of Birmingham, 2004. http://etheses.bham.ac.uk//id/eprint/1471/.
Full textMorrison, Troy. "Particle characterization for an eight inch wafer tungsten chemical vapor deposition system." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/28051.
Full textNi, Peiyuan. "A Study on Particle Motion and Deposition Rate : Application in Steel Flows." Doctoral thesis, KTH, Tillämpad processmetallurgi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-161915.
Full textQC 20150326
Wolff, Trent M. "The Effect of Particle Size on Deposition in an Effusion Cooling Geometry." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1523800099698799.
Full textSamaha, Mohamed Jr. "Characterization of Superhydrophobic Surfaces Fabricated Using AC-Electrospinning and Random Particle Deposition." VCU Scholars Compass, 2012. http://scholarscompass.vcu.edu/etd/2741.
Full textRobertson, Zachary Burton Smith. "Deposition of Newtonian Particles Entrained in a Turbulent Axisymmetric Free Jet." Thesis, Virginia Tech, 2012. http://hdl.handle.net/10919/31884.
Full textMaster of Science
He, Congrong. "Airborne Particles in Indoor Residential Environment: Source Contribution, Characteristics, Concentration, and Time Variability." Thesis, Queensland University of Technology, 2005. https://eprints.qut.edu.au/16017/1/Congrong_He_Thesis.pdf.
Full textHe, Congrong. "Airborne Particles in Indoor Residential Environment: Source Contribution, Characteristics, Concentration, and Time Variability." Queensland University of Technology, 2005. http://eprints.qut.edu.au/16017/.
Full textMorana, Roberto. "The influence of particle type and process conditions on electrodeposited composite coatings." Thesis, Loughborough University, 2006. https://dspace.lboro.ac.uk/2134/8045.
Full textHeald, John Graham Charles. "Development of probabilistic prediction methods for graded sediment from discrete particle simulations." Thesis, University of Aberdeen, 2001. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU485587.
Full textSannes, Kevin Markle 1964. "Finite element analysis of aerosol particle deposition on surfaces inside a clean room." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/277120.
Full textWebb, Joshua J. "The Effect of Particle Size and Film Cooling on Nozzle Guide Vane Deposition." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1313528110.
Full textCasaday, Brian Patrick. "Investigation of Particle Deposition in Internal Cooling Cavities of a Nozzle Guide Vane." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1376651156.
Full textLawrence, Michael James. "An Experimental Investigation of High Temperature Particle Rebound and Deposition Characteristics Applicable to Gas Turbine Fouling." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1376653488.
Full textWaterfall, Benjamin Diarmuid. "The particle size dynamics of fine sediment delivery processes in the Yorkshire Ouse river basin." Thesis, University of Exeter, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267236.
Full textWu, Genfa. "Energetic Deposition of Niobium Thin Film in Vacuum." Diss., Virginia Tech, 2002. http://hdl.handle.net/10919/28110.
Full textPh. D.