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 85 for “"high-viscosity"”.
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Agitation, mixing and mass transfer in simulated high viscosity fermentation broths
… to determine the effect on k\(_L\)a of varying viscosity, agitator speed and type and air flow rate. Increasing solution viscosity results in poorer gas-liquid mixing and a reduction in k\(_L\)a, as has been found by earlier workers. Thus high agitator speeds and power inputs are required to …
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Design, construction, and testing of a ram extruder for high viscosity polymers.
Massachusetts Institute of Technology. Dept. of Mechanical Engineering. Thesis. 1973. M.S.
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Investigating the performance of high viscosity friction reducers used for proppant transport during hydraulic fracturing
<p>"Over the last few recent years, high viscosity friction reducers (HVFRs) have been successfully used in the oil and gas industry across all premier shale plays in North America including Permian, Bakken, and Eagle Ford. However, selecting the most suitable fracture fluid system plays an …
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The Comprehensive Study of High Viscosity Friction Reducers in High-TDS and High-Temperature Environments
<p>"High viscosity friction reducers (HVFRs) have been recently gaining more attention and increasing in use, not only as friction-reducing agents but also as proppant carriers. Reusing of produced water has also been driven by both environmental and economic benefits. Currently, most friction …
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Mechanistic study of slug formation and evolution in high-viscosity-liquid/High-density-gas multiphase flows in channels/pipes
… regime transitions compared to conventional low-viscosity-oil/low-density-gas flows. Many traditional flow regime models for these oil/gas flows result in O(1) prediction errors when applied to high-viscosity-oil/high-density-gas flows because they fail to account for the complex change in …
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Optical Measurements of High-Viscosity Materials Using Variations of Laser Intensity Incident on a Semi-Rigid Vessel for use in Additive Manufacturing
… capabilities. This includes fabrication with high-viscosity materials of many new classes of material compositions, such as doping for magnetic or electrically conducting polymers. These additives complicate the materials deposition process by requiring complex, non-linear calibration to …
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High Pressure Nuclear Magnetic Resonance Studies of Viscous Fluids
… of the common hydrodynamic relationships at high viscosity. The overall objective of this work, then, is to provide a foundation for the systematic investigation of high viscosity fluid dynamics, as has been carried out for low viscosity liquids in this laboratory.
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Binary molecular diffusivities in liquids: prediction and comparison with experimental data
… adequately the diffusivities for most low viscosity as well as for some moderately high viscosity systems. The high viscosity system diffusivities are more accurately predicted by three modified absolute rate theory equations. An important result of this study was the observation that the …
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n.m.r. Studies of Supercooled Viscous Fluids and Silica Gels (Nmr)
… applicability of the hydrodynamic equations to high viscosity systems is investigated at a molecular level in a series of selectively deuterated compounds of varying molecular symmetry and structure. Pressure is used as an experimental variable to extend the range of observable viscosities, and …
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Mass transfer studies in heavy oil recovery using solvents
… oil, sometimes called bitumen, is known for its high viscosity (above 100 cp) and low API gravity (below 22⁰). In most cases, viscosity reduction is needed for the final product. There is a considerable amount of heavy oil in Alberta, Canada and the world's largest heavy oil deposit is in …
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Investigation of alternative jet fuels in gas turbine combustion systems using x-ray radiography
… which is specifically formulated to be a high-viscosity jet fuel. The fuels are tested over a range of fuel flow rates and inlet air preheat temperatures to establish the effect of various combustor conditions on the atomization and vaporization processes. The phase contrast imaging shows …
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Rheology of concentrated protein solutions and attractive colloidal dispersions
Therapeutic protein products with high solution concentration often possess extremely high viscosity and have difficulties in processing and delivery. It is desirable to predict and control the viscosity of protein solutions based on their interactions at the molecular level. Fundamental …
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Enhancing the injectability of high concentration drugs via core annular flows
High concentration drug formulations that can be delivered via subcutaneous injections offer tremendous benefits to global health, but their high viscosity prevents injectability through medical needles. Current approaches to solve this problem face several challenges ranging from cross …
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Analysis of droplet behavior on a rotating surface in atomization-based cutting fluid systems for micro-machining
… approach to the design of ACF systems for high cooling and lubrication performance in micro-machining. On the experimental front, micro-turning experiments are carried out and the cutting performance evaluated for varying cutting fluids and at different droplet speeds. Micro-turning …
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Modeling and design of semi-solid flow batteries
… and operation implications. Because of the high viscosity of semi-solid flow battery suspensions, alternative modes of operation not typically used in conventional redox flow battery systems must be explored to reduce pumping energy losses. Modeling results are presented and compared to …
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Identification of tephras from the Eastern Mediterranean using solid state techniques
… that the magmas involved in the eruptions were high-viscosity magmas.
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Automated liquid dispensing pin for DNA microarray applications
… fabrication with the goals of smaller spot size, higher yield, more efficient usage of biological materials, and capability to handle high viscosity liquids. The new system is based on active sensing and control and it is part of a fully integrated robotic microarray system for genomic and …
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Design and fabrication of a piezoelectric stack actuator for use in a needle-free jet injector
… have been designed for fluids with a similar viscosity to water. Here we design an actuator for use with high viscosity fluids and non-newtonian fluids. The piezoelectric stack actuator presented in this work has been designed to deliver injection volumes of up to 30 microliters while …
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The nutritive, rheological and sensory quality of selected indigenous complementary foods used for 6 – 24 months infants and young children in African communities
… infants and young children. The flow properties (viscosity) of common indigenous/locally available African CPs (n = 8) plus CACFs (n = 23) were investigated at shear rates 0.001/s – 1000/s and 40 °C, using a rotational rheometer. The perception of the oral texture of the selected African CPs, …
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Numerical Analysis of Biodiesel Combustion in a Direct Injection Compression Ignition Engine
… against pressure and temperature data across high and low temperature combustion regimes. The third phase of the work was focused on creating a combustion model for biodiesel. The fourth and final phase was to test the biodiesel combustion model in the pertinent combustion regimes. The …
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