Global ETD Search
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 18 of 18 for “"Particle capture"”.
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Particle Capture by Evaporating Cloud Drops
The capture efficiency was obtained experimentally near 30% relative humidity for cloud drops (56-93 (mu)m radius) with solid spheroidal particles of manganese hypophosphite (0.58-3.2 (mu)m radius) and near 90% relative humidity for drops (60-92 (mu)m radius) with hollow shells of lithium carbonate …
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Low-cost air particulate monitor based on particle capture and imaging
… of a novel PM monitoring method based on capture and imaging are developed and validated. Two capture techniques, electrostatic precipitation (ESP) and fiber-filtration, are demonstrated and verified with corresponding imaging results. Particulates captured either on flat substrate or …
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Observations of a particle capture on a cylindrical collector : implications for particle accumulation and removal in aquatic systems
Capture of suspended particles by cylindrical collectors is an important mechanism in many aquatic processes, such as larval settlement, suspension feeding, and vegetative filtration. The collector Reynolds number (Rec), based on the collector diameter, typically ranges from 1-1000 in aquatic …
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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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PARTICLE REMOVAL IN FLOC BLANKET CLARIFIERS VIA INTERNAL FLOW THROUGH POROUS FRACTAL AGGREGATES
… water treatment train. The mechanism of primary particle removal in floc blanket clarifiers was characterized via size-based performance curves obtained from light blocking particle counters that measured the effluent of a laboratory-scale floc blanket clarifier treating synthetic raw water. …
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Multiphase models of slag layer built-up in solid fuel gasification and combustion
… slag. The model incorporates two submodels for particle capture and wall burning; takes into consideration the temperature and composition dependent properties of slag, the contribution of momentum of captured particles and the possibility of slag resolidification. The model predicts the local …
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Hydrodynamic studies and mathematical modeling of fine coal flotation
The probability of particle capture by an isolated bubble rising through a suspension of particles has been determined using fundamental principles of fluid mechanics. This analysis has allowed the rate constant for flotation to be evaluated as functions of bubble sine, particle size, flotation …
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Scavenging of atmospheric particles by water drops
<p>"In the first paper, the mechanisms of particle capture and coalescence of aerosols by a moving water drop in the atmosphere are studied using the boundary-layer flow approximation. The particle trajectory is computed by solving the equations of motion of the particle both outside and inside the …
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Size based separation of submicron nonmagnetic particles through magnetophoresis in structured obstacle arrays
… size based separation technology for nonmagnetic particles in the submicron size range utilizing magnetophoretic forces. When a nonmagnetic particle is immersed in a magnetic fluid and subjected to magnetic field gradients, it behaves like a magnetic hole and experiences magnetic buoyancy forces …
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Effects of Dissolved Gas Supersaturation and Bubble Formation on Water Treatment Plant Performance
… Gas bubbles attached to coagulated floc particles can reduce settling efficiency and create "floating floc." In laboratory experiments, bubbles formed on the surface of the mixing paddle, since this was the location of minimum pressure within the system. The formation and stability of …
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Nanoporous elements in microfluidics for multi-scale separation of bioparticles
The efficient isolation of specific bioparticles in lab-on-a-chip platforms is important for many applications in clinical diagnostics and biomedical research. The majority of microfluidic devices designed for specific particle isolation are constructed of solid materials such as silicon, glass, or …
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Feedbacks between plants, flow, and particle fate
Environmental flows carry a wide variety of particles that interact with vegetation. Vegetated canopies are anchored by sediment, release pollen and seeds to colonize new ground, rely on nutrients carried by sediment, and may be killed by disease spores. While the influence of vegetation on flow …
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Droplet and Particle Dynamics in Aerosol Reactors and Environmental System
… for the large-scale production of nanoparticles. Synthesis of particles with a desired the size and morphology is of key importance for exploiting their properties for their use in several emerging technologies. In contrast to useful nanomaterials, the aerosols from industrial flue gas, …
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Nanoscale structural/chemical characterization of manganese oxide surface layers and nanoparticles, and the associated implications for drinking water
… coating layers are composed of nanoscale particles and films. Hence, understanding the nanoscale particle and film formation mechanisms is essential to comprehend the complexity of soluble contaminant removal processes. The primary objective of this study was to understand the initial …
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Design and Numerical Simulation of the Real-time Particle Charge and Size Analyser
… charge and size distribution of aerosol particles play a very important role in many industrial applications. Due to the complexity and the probabilistic nature of the different charging mechanisms often acting simultaneously, it is difficult to theoretically predict the charge …
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VEHICLES¿ NON-EXHAUST EMISSIONS: SETUP OF EXPERIMENTAL APPROACHES FOR ON-ROAD CHARACTERIZATION OF TIRE WEAR AND ROAD DUST PARTICLES
… particularly those from tire and road wear particles (TRWPs), have emerged as a dominant and under-investigated source of airborne particulate matter. TRWPs are mechanically generated, chemically complex, and highly variable, posing challenges for both environmental monitoring and regulatory …
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Mathematical modeling of membrane filtration
… fouling mechanisms: (i) adsorption of very small particles within membrane pores; and (ii) blocking of entire pores by large particles. Asymptotic techniques are used based on the small pleat aspect ratio to solve the model, and solutions are compared to those for the closest-equivalent unpleated …
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Measurements and Modeling of Coal Ash Deposition in an Entrained-Flow Reactor
… measurements in on a simulated boiler tube where particle mass deposited and ash size distribution are measured. Several model components governing various aspects of ash deposition have been incorporated into the UDF which has been implemented in a quasi-unsteady Computation Fluid Dynamics (CFD) …