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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 42 for “"Spherical particle"”.
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A Study of Holography for Spherical Particle Size Analysis
Made available in DSpace on 2014-12-08T22:24:43Z (GMT). No. of bitstreams: 1 7000993.pdf: 3734326 bytes, checksum: c9841c37f43a9a6098caecc71639ea09 (MD5) Previous issue date: 1969
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Interaction Between a Spherical Particle and Wall -Bounded Flows at Finite Reynolds Number
… we investigate the interaction of a finite-sized particle embedded in a turbulent channel flow. Particles of various sizes have been located at two specific wall-normal locations, the buffer region and the channel center. Near-wall region mechanisms are observed consisting of such different events …
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On the Response of a Spherical Particle to Unsteady Flows at Finite Reynolds Numbers
… of turbulence on the motion of a freely settling particle is also investigated. In all cases considered, the inertial response time of the particle is the same as the Kolmogorov time scale of the freestream turbulence. Over the parameter range considered, turbulence is found to have a minor effect …
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Diffusive and convective transport of a polar, orentable spherical particle near an adsorbing wall
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1995.
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Application of a Non-intrusive Optical Non-spherical Particle Sizing Sensor at Turboshaft Engine Inlet
… dangerous. In order to combat these issues, a particle sensor with the ability to monitor in-stream particulate size, shape, and mass flow rate is necessary. Our team with the Advanced Propulsion and Power Laboratory developed a non-intrusive optical sensor that is able to characterize …
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Learning-Based Control for Optically Trapped Non-Spherical Particles
… in most situations, becomes significant toparticle dynamics when the particle size is on the micron-scale or smaller. An optical tweezers system harnesses the momentum of light to manipulate these small particles by trapping them near the focal point of a sharply focused laser beam. Since …
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Magnetic iron oxide nanoparticles: synthesis, characteristics, magnetic behavior, and biomedical applications
Magnetic iron oxide nanoparticles are attracting increasing attention due to their interesting properties that can be applied in a great number of applications such as catalysis and biomedicine. This thesis focuses on the synthesis, characteristics, and biomedical applications of iron oxide …
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The Role of Instantaneous Forces in Particle Movement
… are needed to determine the point at which a particle will move. Turbulent fluctuations in velocity seem to have an effect of particle entrainment. The fluctuations in velocity can be several times greater than their time averaged counterparts. These short durations of high velocity often …
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Modeling and simulation of micro/nano-rod distribution in micro channel flows
<p>"The behavior of a typical nanorod particle in microscale flows was theoretically investigated, considering the effect of the wall on the rotational and translation motions of the non-spherical particle. Initially, a systematic method using Brownian dynamics simulation of the rotational motion …
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Impact Characterization of Earth Entry Vehicle for Terminal Landing (on Soil)
… arbitrary Lagrangian-Eulerian (ALE), and spherical particle hydrodynamics (SPH) are compared to determine their relative accuracy in modeling soil deformation and EEV acceleration. Experimentally validated soil material parameters and element formulations were then used in parametric …
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Silica mesocellular foam and carbon nanofoam for fine chemical synthesis and separation
… phase. In packed-bed applications, narrow particle and pore size distributions and uniform particle shape would lead to improved separations. Thus, spherical stationary phase particles are often preferred, but the challenge has been to combine spherical particle morphologies, high surface …
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Study of Fluid Forces and Heat Transfer on Non-spherical Particles in Assembly Using Particle Resolved Simulation
… systems. Most of the studies have focused on spherical particle shapes, however, in most natural and industrial processes, the particle shape is seldom spherical. In fact, particle shape is one of the important parameters that can have a significant impact on momentum, heat and mass transfer, …
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Tartaglia, Zigzag et Flips : les particules denses à haut Reynolds
… The turbulent behavior of the flow around a spherical particle provides lateral forces with complex temporal dependency. This induces zigzag trajectories which are occasionally observed in volley, soccer and baseball. We inspect the condition of occurrence of this phenomenon. Then, the case …
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Induced-charge electrokinetics at large voltages
… puzzles include strange behavior of colloidal particles, high-frequency flow reversal in microfluidic ACEO pumps, and concentration dependence of electrokinetic slip. Theoretical developments would help not only in exploiting poorly understood effects favorably, but also in building more …
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Production of nanocrystalline rdx by ress : development and material characterization
… reduction, the effect at the nano-scale particle size has not been investigated. To generate nanocrystalline RDX a recrystallization process was developed based on rapid expansion of supercritical solutions (RESS). Compressed carbon dioxide was utilized as the solvent for RDX. Effect of …
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CFD – DEM Modeling and Parallel Implementation of Three Dimensional Non- Spherical Particulate Systems
… combustion, blood cellular systems and granular particles in fluidized beds, have often been computationally represented using spherical surfaces, even though the majority of particles in archetypal fluid-solid systems are non-spherical. While spherical particles are more cost-effective to …
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THE REACTIVITY OF SOME TRANSITION METAL NITRIDES AND CARBIDES
… the reaction takes place at the surface of a spherical particle of diminishing size as the reaction pioceeds. Surface area measurements and electron microscopy have been utilized to study the ability of the product formed during the oxidations to sinter. X-ray diffractometry has been used to …
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Numerical study of particle dynamics in a falling-ball viscometer
The falling-ball viscometer is a device where a spherical particle falls along the axis of a circular cylinder filled with viscous fluid. The various classical results for this device are developed under the assumption that the Reynolds number of the flow is zero, i.e., Stoke's flow. Inertial …
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Theoretical investigations of the role of excluded volume, topological constraints, and attractive forces in the slow dynamics of soft matter systems
… of excluded volume and attractive forces in spherical particle liquids, and (ii) the role of connectivity and topological constraints in polymeric liquids. The former studies are primarily discussed in Chapters 3 and 4, where we answer questions about the interplay of repulsive and attractive …
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Stratification in Drying Particle Suspensions
… studies of drying suspensions of bidisperse nanoparticle mixtures. I first use an explicit solvent model to investigate how the structure of the dry film depends on the evaporation rate of the solvent and the initial volume fractions of the nanoparticles. My simulation results show that the …
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