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Showing 1 to 20 of 109 for “"polydisperse"”.
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Mechanics of polydisperse suspensions
… the results of numerical simulations for polydisperse sedimentation of equal sized spheres, e.g. particles of different density. Using the stokesian dynamics algorithm, mobility matrices are computed for random particle configurations and ensemble averages taken to calculate the mean …
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Network morphologies in monodisperse and polydisperse multiblock terpolymers.
… i) “monodisperse” OSISO pentablocks and ii) polydisperse ISO triblocks. The OSISO pentablocks are synthesized using a protected initiation strategy that required the development of the functional organolithium 3-triisopropylsilyloxy-1- propyllithium (TIPSOPrLi). TIPSOPrLi may be used to …
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Simulation methods for polydisperse, multiphase flows using moment methods
… order to accurately solve for systems containing polydisperse multiphase flows, and flows with velocity distributions. The ability to correctly solve these flows allows for the local segregation of size that is generally not possibly due to the limitations of the standard solution techniques. …
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Evaluation of an Aerodynamic Particle Sizer With Certified Polydisperse Test Dusts
<p>The Aerodynamic Particle Sizer (APS) is a near real time laser particle sizer that counts and sizes particles in the range of 0.5 /xm to 3 0 /xm, which makes it ideal for measuring the particle size distribution of fly ash from coal combustion. While the APS has proven to be a valuable …
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Eulerian modelling and computational fluid dynamics simulation of mono and polydisperse fluidized suspension
… We then address the mathematical modelling of polydisperse fluidized suspensions, which are characterized by a continuous distribution of the particle properties, such as size or velocity. Here we adopt a more powerful modelling approach based on the generalized population balance equation …
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Turbulence Modulation of Polydisperse Particles in a Square Particle-Laden Jet: Numerical Investigation
… investigate the turbulence modulation of polydisperse particles in a square particle-laden jet. Turbulence modulation describes the effects of fluctuating velocity and intensity when the particles and continuous fluid interact in a turbulent flow field. The rate at which turbulence …
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Dynamic Light Scattering for the Characterization of Polydisperse Fractal Systems by the Example of Pyrogenic Silica
Dynamic light scattering (DLS) is a method to size submicron particles by measuring their thermal motion (diffusion) in suspensions and emulsions. However, the validity of the Stokes-Einstein equation that relates the diffusion coefficient and the particle size is limited to spherical particles and …
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Development of a 20-moment Polydisperse and Polykinetic Spray Model Coupled With a Surface Density Approach for the Modelling of the Dense and Disperse Liquid Spray Regimes
… spray regime, the newly developed 20-moment polydisperse, polykinetic AG moment closure approach is used for the modelling of the spray distribution. In this model, statistical spray quantities describing the droplet size/velocity distribution and size-velocity correlations evolve according …
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Random Packs and Their Use in Modeling High Speed Porous Flow
… (LS) packing algorithm to create polydisperse packs of spheres for modeling heterogeneity in solid rocket grains. We have greatly improved upon the computational efficiency of the original algorithm by using hierarchical cells in 3D. The speed-up enables the generation of …
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Energy absorption of reticulated foams filled with shear-thickening silica suspensions
… to create shear thickening fluids. The first are polydisperse and non spherical, with a median diameter of 1.7 ± 1.4 micrometer, while the second are monodisperse spherical particles of 0.3 ± 0.03 micrometer diameter. The particles are dispersed in ethylene glycol at volume fractions of up to …
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Study of dynamics of airflow and aerosol transport and deposition in human upper airways using large-eddy simulations
… Under steady flow, monodisperse (1–10 μm) and polydisperse aerosols are analyzed. The study shows that complex airflow dynamics directly influence aerosol transport and deposition, causing global deposition to increase nonlinearly with particle size and Reynolds number, with the larynx being a …
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Equilíbrio de fases de soluções polidispersas de polímeros
… model was extended to handle multicomponent polydisperse systems. The model was implemented in MATLAB ® and although relatively simple, fitted experimental data accurately after estimation of the polymer-solvent interaction parameter, χij . This concluded that the interaction parameter is a …
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Structure formation and fractionation in systems of colloidal rods
… systems of synthesized mesoscopic rods have a polydisperse length distribution as a consequence of the longitudinal growth process of the rods. For many technical and research applications, a rather small polydispersity is desired in order to have well defined material properties. The …
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Multiphase Flow in Explosive Volcanic Eruptions: Field and Numerical Results
… numerical modeling results of mono- and polydisperse impinging jets with length scales and physical parameters relevant to large explosive volcanic eruptions. Our modeling shows that particle behavior is sensitive to whether a jet is monodisperse or polydisperse. For a monodisperse jet, …
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OpenFOAM Implementation of Microbubble Models for Ocean Applications
… made between the different methods for both polydisperse and monodisperse multiphase flows. A multigroup method for polydisperse bubbly flows with the bubbles binned in terms of mass was selected from the various alternatives, which included other multigroup models and moment methods. The …
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Concentration profiles at amorphous polymer-polymer interfaces
… dynamics for the symmetric monodisperse and polydisperse interfaces, the asymmetric monodisperse interface, the symmetric blend interfaces, and the asymmetric interfaces of two different polymers. The profiles obtained are used to study the properties of corresponding interface. Specular …
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Radiative heat transfer in directly-irradiated high-temperature particle-gas flows
… in transient particle-gas flows featuring polydisperse particles is not reported. Radiative heat transfer in particle-gas flows is the dominant mechanism in solar particle receiver applications. Knowledge of the radiative properties as input of radiative transfer analysis is critical to …
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Radiative heat transfer in directly-irradiated high-temperature particle-gas flows
… in transient particle-gas flows featuring polydisperse particles is not reported. Radiative heat transfer in particle-gas flows is the dominant mechanism in solar particle receiver applications. Knowledge of the radiative properties as input of radiative transfer analysis is critical to …
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