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 20 of 23 for “"Solid Fraction"”.
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The impact of stress history of deformable dry granules on the mechanical properties of tablets
… milled granules that are polydisperse in solid fraction, size, and shape are extensively used for compaction studies. Thus, the effect of an individual granule property or an individual component on the compaction properties of dry granules was not adequately separated. To advance the …
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Bubble dynamics on structured surface in microchannel
… tend to stay on top surfaces of pillars at solid fractions greater than 0.162, keeping liquid films underneath the bubbles. On the other hand, on surfaces at solid fraction less than 0.162, bubbles tend to propagate within the pillar unit cells. A flow loop with good degassing and a fluid …
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Modeling the dynamics and stresses of elongated particles in vertical axis mixers
… (DEM) model is used to examine the velocity, solid fraction, and particle orientation fields of non-cohesive, sphero-cylindrical particles agitated in a vertical axis mixer for a range of particle aspect ratios and bed depths. The model is validated against experimental measurements of the …
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Pressure-driven instability in planetary stagnant lids
… resulted in temperatures well in excess of the solidus of silicates, with radiogenic heating also playing a major role. In many cases this results in a partially molten mantle, known as a magma ocean. Both fully solid mantles and magma oceans are noted for their complex fluid dynamics, in …
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Diffusion in an absorbing porous medium : from microscopic geometry to macroscopic transport
… cubes, absorption in the bulk scales with the solid fraction to the two-thirds power. The statistical distribution of reaction rates in these models is found to be inversely related to the reaction rate. A quasi-static Monte-Carlo model is also investigated. The more complex problem of …
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Fabrication and Compressive Behavior of Corrugated Aramid-Epoxy Cellular Solids
<p>Cellular solids are materials whose base material does not always occupy the entire solid fraction available. A number of cellular solids can provide blast protection and absorb impact energy, but few perform well resisting blunt object (ballistic) penetration. In this thesis, a method is …
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Deep Learning Methods for Predicting Fluid Forces in Dense Particle Suspensions
Modelling solid-fluid multiphase flows are crucial to many applications such as fluidized beds, pyrolysis and gasification, catalytic cracking etc. Accurate modelling of the fluid-particle forces is essential for lab-scale and industry-scale simulations. Fluid-particle system solutions can be …
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DEM simulated radial and axial pressure in a cylindrical granular column
… load. In addition, we studied the radial solid fraction to better understand the pattern of radial pressure evolution. The force model that corresponds to linear spring-dashpot model and energy dissipation is simulated by frictional forces: inter-particle and particle-wall. In this model, …
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Direct Simulations of Fluid-Particle Flow in Newtonian and non-Newtonian Fluids Using Coupled Lattice Boltzmann and Discrete Element Methods
… are investigated, as the particle shape and solid fraction vary. An increase of the relative viscosity is observed when the particles become more oblate, accompanied by an increase of particle contacts and contact distance. Particle reorientation is seen to occur systematically in denser …
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Investigation of Momentum and Heat Transfer in Flow Past Suspensions of Non-Spherical Particles
… momentum and heat transfer between the fluid and solid phase is critical to the study of fluid-particle systems. Dense suspensions are characterized by the solid fraction (ratio of solid volume to total volume), the particle Reynolds number, and the shape of the particle. The behavior of …
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The Effect of Crystalline and Amorphous Lactose on Mechanical Properties of Roller Compaction Ribbons and Tablets
… relatively poor binding properties and consolidates mainly by fragmentation due to its `brittleness'. Though this is true of crystalline lactose, previous direct compaction research has found that amorphous lactose is known to be more compressible than its crystalline form. This research …
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Dietary amino acids and their contribution to de novo lipogenesis
… was to investigate the effect of changing the solid/liquid ratio of meals on gastric emptying as well as the effect of changing meal compositions on lipid metabolism. A 5-way crossover human study demonstrated that liquid carbohydrate was the main determinant of gastric emptying rate compared …
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Acoustic measurements of flowing and quasi-static particulate suspensions
Flowing suspensions of solid particles in gas can be found in various industrial applications, as a method for transporting powdered solids (known as "pneumatic conveying"). The problem of measuring the mass concentration of the solid fraction has not yet been satisfactorily resolved. This thesis …
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Hot tearing and constitutive behaviour of semi-solid aluminum alloys
The occurrence of hot tearing during solidification is one of the major factors influencing both the quality and productivity of aluminum castings. In order to reduce the formation of hot tears, quantitative information regarding both hot tearing formation and semi-solid deformation is essential. …
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Nasal delivery of peptides using powder carriers based on starch/poly(acrylic acid)
… nasal formulations was modified by changing the solid fraction of the dispersion (prior to freeze-drying) and by changing the freezing rate during the freeze-drying cycle. The bulk density was mainly determined by the solid fraction of the dispersion: the bulk density of the powders increased …
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The biogeochemistry of 210Pb and 210Po in fresh waters and sediments
… geochemical parameters were measured on the solid fraction and pore waters of two cores taken from the deepest basin in August and September. The radionuclides were two orders of magnitude higher than in overlying water and had steep concentration gradients that could support substantial …
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Characterisation of Tablets and Roller-Compacted Ribbons with Terahertz Time-Domain Pulsed Imaging
… ([150]) values provides foundations to test the solid-fraction ratios of pharma tablets with regard to RI’s being surrogate values to SF/path-length (R2 = 1). Combining transmission principles to the portion of reflected EMR removes the pre-requisite for RI or path-length knowledge, giving +1.5 …
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Wettability on nanoparticle modified surface: for thermal engineering
… implying better wettability of liquid on solid surface, is preferred in some processes of air-conditioning and power-generation systems, such as dehumidification, evaporative cooled condensers, and pool boiling at high heat flux. Recent research in nanofluid boiling has revealed a …
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Vibrated granular matter
… accelerations within a certain interval a solid-like and a gas-like domain coexist. The solid fraction decreases with increasing acceleration and shows hysteresis. Complementary to the experimental studies a molecular dynamics simulation was used to extract local granular temperature, …
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Computational Studies of the Mechanical Response of Nano-Structured Materials
… of metallic bicontinuous lattices with varying solid volume fraction, connectivity, size, surface stress, loading procedures, and solid density. Strain localization and yield response on nanoporous gold lattices as a function of their solid volume fraction are investigated in axially strained …
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