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 “"cone and plate"”.
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The stability of viscoelastic fluids in complex flows : the role of shear and extensional rheology
Understanding the flow of polymeric fluids is important for optimizing commercial processes such as injection molding and fiber spinning. The combination of streamwise curvature and elastic normal stresses can lead to the onset of elastic flow instabilities, severely rate-limiting such processes. …
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Rheological investigations of debris flow materials
… viscometer/rheometer was designed, constructed, and used to test the behaviour of coarse grained debris flow materials. A 1/5 scale model was also constructed and used to test fluid-only and grain-fluid mixtures. The 30° inverted cone-and-plate viscometric system produced results comparable to …
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A fundamental study of the flow of dilatant fluids
… physical properties of dilatant fluids, and to propose a theory for the mechanism of dilatancy. In order that the correlation for flow of dilatant fluids in conduits could be tested it was necessary to build a flow apparatus from which pressure drops and flow rates could be measured, to …
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Rheological study of solutions of high concentrations of Carboxymethyl cellulose
… purpose for this thesis is to provide a complete and comprehensive theological study for a high range of CMC concentrations. The objective is to reveal the measurements of steady-state parameters, transient shear stress response, and yield stress of Carboxymethyl Cellulose. Also, the thixotropic, …
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The rheological properties of aqueous polyacrylamide solutions
… or processing aids in the manufacturing of paper and paperboard products. In addition, they have been widely used in enhanced oil recovery. In this thesis, an experimental work has been carried out to provide a complete and comprehensive study of the rheological properties of polyacrylamide …
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An empirical constitutive equation for anti-coagulated human blood
… contains two parameters, the consistency index and the non-Newtonian index for the fluid. Viscometric data, utilizing a cone and plate viscometer, were obtained from anticoagulated blood samples of known hematocrit levels and chemical compositions. A multiple regression technique with apparent …
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Effect of nonionic surfactant (X-100) on the rheological properties of aqueous polyacrylamide solutions
… as thickening agent, for turbulent reduction and many other uses. They have been extensively used in enhanced oil recovery. In many cases, polyacrylamide comes into contact with surfactants which lead to a change in its rheological properties. In this study, an experimental work was carried …
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Droplet coalescence in the shear flow of model emulsions
… to other regions within the flow field. Understanding these different processes, both individually and jointly, is relevant, for example, to the development of morphology in immiscible liquid-liquid systems such as polymer blends formulated using single screw or twin screw extruders. While …
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Development of a Toolkit to Investigate Endocardial Endothelial Cellular Response in Left Ventricular Outflow Tract Pathologies
… factors of DSS membrane formation by isolating and characterizing endocardial endothelial cells (EECs) that line the left ventricular outflow tract (LVOT), modeling the elevated wall shear stress (WSS) observed in DSS patients, and creating a tunable scaffold that can be used to investigate the …
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Characterization of the viscoelastic and flow properties of High Density Polyethylene Resins for Pipes in the Solid and Melt State
… corrosion resistant, unlikely to have leaks, and are low cost. The chain structure of the polymer, the extrusion and cooling conditions, the resulting morphology and the ambient conditions all play an important role in the pipe's performance. A new generation of high density polyethylene …
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Butterflies and batteries : advances in liquid repellent surfaces by anisotropic wetting and lubricant impregnation
… on decreasing the interaction between a liquid and a solid surface by modifying the surface's chemistry and cleverly designing its geometry on nano- and millimetric length scales. This thesis explores two advances to control a liquid's interaction with a surface: 1) deflectable structures that …
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The Dynamic Behavior of a Concentrated Composite Fluid Containing Non-Brownian Glass Fibers in Rheometrical Flows
… The focus of this work is to understand the rheological behavior of these materials and its connection to fiber orientation as determined in simple shear flow. The work includes the development of a novel approach to characterizing the transient rheology; an experimental study of the …
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Synthesis and Photopolymerization of Novel Dimethacrylates
… structural modifications of Bis-GMA in the core and the side chain and required a two-step reaction. The first step was propoxylation or ethoxylation of the bisphenols and the second step was the methacrylation of the resulting products. The core structures are designated by Bis-A for …
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Use of the hole pressure data to obtain N1 at high shear rates for polymer melts
… has been used for both flow visualization and direct pressure measurements of the hole pressure (Ph). The results from these measurements have been used to evaluate the Higashitani-Pritchard-Baird (HPB) equation which has been proposed for determining the magnitude of the primary normal …
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Textured fluids
The rheology and development morphology of textured fluids have been investigated. The first fluid considered in this work was a liquid crystalline polymer consisting of isotropic and anisotropic solutions of poly-p-phenyleneterephthalamide (PPT) in sulfuric acid. The second textured fluid …
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Use of sol chemistry and fine grained precursors in the production of controlled microstructural polycrystalline continuous oxide fibres
… in aqueous media enabled good extrusion and drying characteristics, exhibiting Newtonian flow behaviour and draw down to fired fibre diameters, typically in the range of 10 - 20~m, the finest being almost defect free. The inorganic salt/alkoxide precursor ratio was optimised to 55:45 …
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Characterization of Carbon Mat Thermoplastic Composites: Flow and Mechanical Properties
… porous mat with the carbon fibers well dispersed and randomly oriented in a plane. CMT composites offer substantial cost and weight savings over typical steel construction in new automotive applications. In production vehicles, automotive manufacturers have already begun to use glass mat …
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Leukocyte Response to Elastin-Like Polypeptide Coatings
… due to luminal narrowing from thrombosis and intimal hyperplasia. Current attempts to address this issue include the development of materials that support endothelialisation and protein modification to the material surfaces that reduce thrombosis. The extracellular matrix protein elastin …