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 22 for “"Dense Suspensions"”.
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Relaxation behavior of dense suspensions
Dense suspensions of solid particles in Newtonian fluids exhibit a variety of non-Newtonian behaviors depending on the shear stress applied to the suspension and the particle mass fraction ([mathematical symbol]m). Suspensions at sufficiently high fm shear-thicken dramatically and eventually shear …
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Mechanical properties of dense suspensions: Variations with interaction potential
… of interparticle potential on the rheology of dense suspensions was studied experimentally. Monodisperse submicron silica particles in aqueous solutions were used as model suspensions. The interaction potential between the particles was manipulated from repulsive to attractive by adjusting the …
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Glassy viscoelasticity of dense suspensions of soft colloids and structure & miscibility of soft filler polymer nanocomposites
In this thesis, we studied two soft condensed matter systems. The first part of the thesis studied the glassy viscoelasticity of dense suspensions of soft colloids and the second part of the thesis studied the structure and miscibility of soft filler polymer nanocomposites (PNCs). In the first part …
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Batch and continuous production of stable dense suspensions of drug nanoparticles in a wet stirred media mill
… milling for the production of drug nanoparticle suspensions. However, a fundamental scientific/engineering understanding of various aspects of this process is still lacking. These challenges include elucidation of the governing mechanism(s) during nanoparticle formation and physical stabilization …
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Relaxation of Dense Suspension
Dense suspensions exhibit complex rheological behavior by behaving liquid-like at low shear stresses and solid-like at high shear stresses. The microscopic interactions between individual particles create non-Newtonian macroscopic behaviors by transitioning from hydrodynamic interactions to …
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Dynamic behavior of unsteady turbulent motion in pipe flows of dense gas-solid suspensions
Unsteady stratified motions in dense gas-solid suspension in horizontal pipe flows at low velocities have been observed, but the means for predicting these motions are lacking. For a dense suspension, the effects of particle-particle interaction, the damping of fluid motion by particles and the …
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Dynamics and Structures of Phospholipid Assemblies
… as a unique system, in which the vesicles in dense suspensions exhibits dynamical features corresponding to their soft, hollow and polydisperse characteristics. (2) Shape transformation of lipid membrane. Seeking a general understanding of shape deformations associated with biological …
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Characterization of Protein Interactions in Eye Lens Crystallin Proteins and Crystallization
… through light scattering properties of dense suspensions. One context where protein interactions have an impact on the state of aggregation is in protein crystallization. Crystallization of globular macromolecules is a difficult process. Often identification of the conditions resulting …
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The effects of concentration, interaction, size distribution and shape anisotropy on rheology of colloidal mixtures
… studies the rheological properties of dense colloidal mixtures. Particular interest is focused on the role of volume fraction and strength of interactions that lead to glass or gel formation. Variables studied include particle concentration, strength of attraction, particle size …
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Computer simulation studies of dense suspension rheology. Computational studies of model sheared fluids; elucidation, interpretation and description of the observed rheological behaviour of simple colloidal suspensions in the granulo-viscous domain by Non-Equilibrium Particulate Dynamics.
… flow phenomenology commonly seen in dense suspensions are investigated by particulate-dynamics computer-simulations. The objectives of these investigations are: (i) to establish the origins of various aspects of dense suspension rheology such as shear-thinning, shear thickening and …
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Instabilities in particle-laden flows
… processes and in nature. Dry granular flows and suspensions have been well studied and present a broad range of problems in terms of rheology and instabilities. In both cases, new phenomena are continually discovered. Indeed, complex behavior can be exhibited whether the granular media acts like …
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Self-organisation of confined active matter
… This thesis analyses the self-organisation of dense bacterial suspensions in three different microchambers: flattened drops, racetracks and lattices of cavities. Suspensions of swimming bacteria are well-known to spontaneously form macroscopic quasi-turbulent patterns such as jets and swirls. …
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Applications of a novel many-component Lattice Boltzmann simulation
… many important systems which involve the flow of dense suspensions of deformable particles; blood is an example. However, the modeling of such materials represents a considerable challenge to established methods such as computational fluid dynamics (CFD). In this PhD project, work has been …
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Confined Flow of Attractive Colloidal Suspensions
… While the flow properties of hard-sphere suspensions in micro-scale geometries have been studied extensively, the effects of interparticle attractions and particle size dispersity on the confined flow properties of particulate suspensions are not well understood. We used confocal …
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Fracture Morphologies in Particulate Suspensions
… drying and discontinuously shearthickening suspensions shear-jam and fracture under applied stress. In both systems, the morphology and dynamics of fracture reveal the internal stresses in the material: craquelures in old paintings reveal details of the painting technique used; crack …
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Investigating multi-directional inhomogeneous granular suspensions
… Several models of granular flow and granular suspensions (where a viscous fluid is present in the voids between the granular particles) have been proposed in the last decade and a half. These models are unified in the way that dimensional analysis is employed to describe bulk properties of the …
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Applications of Data-Driven Learning Models in Fluid Mechanics: Solid-Fluid Multiphase Systems and Bat Flight
… drag force modeling for particulate suspensions, (2) reduced-order modeling (ROM) for flow predictions in randomly arranged solid arrays, and (3) data-driven analysis of bat flight kinematics. First, we address the challenge of accurately predicting individual particle drag forces in …
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Rheology of polyelectrolyte multilayer modified suspension
… modified colloids. Thereby, the focus lies on dense colloidal suspensions for which the individual motion of single particles is strongly restricted by the neighboring particles. Then, the suspensions show simultaneously elastic and viscous properties with dominating solid-like behavior at …
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Direct visualization of electron transport among nonconjugated polymeric redox-active colloids via fluorescence microscopy
… collision and energy transport in colloidal suspensions, understanding energy transfer in redox-active polymers and particulate media has potential to impact flow batteries, organic electronics and accelerate discovery of redox-based conducting polymers with improved CT properties. 2) The …
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Confinement-mediated accumulation and collective dynamics of microswimmers
… present an experimental setup to investigate suspensions of magnetotactic bacteria. The experiments were carried out during a visit to the group of Prof. Kari Dalnoki-Veress (McMaster University). These bacteria synthesize nanomagnets in their cytoplasm and align passively with external …
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