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 162 for “"droplet size"”.
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Effects of Flow Rate and Droplet Size on Double Emulsion Morphology
… of three fluids, an air bubble and oil droplet in water. The experimental results have been compared to a morphology diagram based on the spreading factors that depend on the interfacial tension between two fluids. The possible morphologies are complete engulfment, partial engulfment, …
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Instrument for the measurement of the droplet size distribution in clouds
Thesis (Sc.D.) Massachusetts Institute of Technology. Dept. of Meteorology, 1952.
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Effects of droplet size on intrusion of sub-surface oil spills
This thesis explores the effects of droplet size on droplet intrusion in sub-surface oil spills. Laboratory experiments were performed where glass beads of various sizes, which serve to simulate oil droplets in deepsea oil spills, were released vertically in a quiescent salinity stratified ambient …
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Production of emulsions with controlled droplet size containing bioactive compounds using membranes
En el presente trabajo, se han preparado emulsiones simples y dobles, de interés en la industria alimentaria, farmacéutica y cosmética, conteniendo biocompuestos con capacidad antioxidante, tanto de carácter lipófilo (luteína), como hidrófilo (resveratrol). Para ello, se utilizaron diferentes …
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Oscillating Dispersed-Phase Co-Flow Microfluidic Droplet Generation: Effects on Jet Length and Droplet Size
Droplet-based microfluidics have emerged as versatile platforms offering unique advantages in biology and chemistry. Although there is adequate control on size and monodispersity, most conventional microfluidic techniques cannot generate more than one droplet size at a time in a continuous and …
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Laboratory studies of the biodegradation of chemically dispersed oil: effect of droplet size and nutrient amendment
… concentration of nutrients in water and on the droplet size distribution. Using water from the shorelines of Atlantic City, we placed the water with oil and dispersant inside EPA Baffled Flasks and placed them on rotatory shakers. We selected two speeds: high (250 rpm) and low (125 rpm). We also …
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Characterization of Black Liquor Sprays for Application to Entrained-Flow Processes
… images analyzed with computer code to produce droplet size data and macroscopic spray characteristics such as mass distribution. Fluid flow rates were measured to allow relevant dimensionless groups for the spray to be calculated. A 1000 degree C tubular furnace was placed around the spray to …
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Dairy ingredients-based emulsions and beta-carotene delivery
… four model O/W emulsions with different initial droplet size, oil phase compositions, emulsifiers, and water phase compositions. A representative lipophilic bioactive nutrient, β-carotene, was encapsulated into these model emulsions. Emulsion properties, and the in vitro digestion, release, …
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Preparation and Evaluation of Oil-in-Water Self-Nanoemulsifying Systems with Potential for Pulmonary Delivery
… for clarity, precipitation, zeta potential, and droplet size distribution. Nanoemulsions were characterized using dynamic light scattering, electrophoretic light scattering, transmission electron microscopy and differential scanning calorimetry. The droplet size analysis was done using Dynamic …
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Studies on the fluidised bed granulation process.
… by studying the spray characteristics and droplet size of the atomised granulating solution, and investigating powder bed hydrophobicity. Spray characteristics of the atomised granulating solution were measured using a Malvern ST 1800 Particle and Droplet Size Analyser. A direct correlation …
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Development of High-Speed Camera Techniques for Droplet Measurement in Annular Flows
… a specific focus on the annular flow regime's droplet behavior. The study aims to contribute to the evaluation of safety and efficiency in nuclear reactors that handle fluids transitioning between liquid and gas states for thermal energy transport. Central to the investigation is the collection …
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Radiative impacts on water mist/cloud droplet condensative growth
The effect of thermal radiation on cloud droplet evolution was investigated both experimentally and theoretically. Droplet size measurements were conducted on laminar, saturated water mist flowing through a tube apparatus with an inner wall cooled to induce radiative heat transfer from the mist …
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Equilibrium Conditions of Hydrate-Forming Pickering Emulsions
… include freezing and melting of the dispersed droplets. New phase equilibrium data of (cyclopentane hydrate + water 60:40) emulsions, in the concentration range from 0.1 to 2% of Span 80, is determined at atmospheric pressure (101.325 kPa). Requirements for thermodynamic validity of the …
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Microfluidic emulsion characterization for the development of armored droplet arrays
… device to produce monodisperse water droplets in a polymer flow with sufficient spacing to polymerize a protective shell around the droplets using continuous flow lithography. Contact angle measurements and surface tension measurements were used to determine how wettable the polymer is …
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Seeking Understanding of Acoustics and Spray Character in a Three-Stream Pulsating Transonic Airblast Injector
… Unexpectedly, a new trend for temporal mean droplet size, when normalized by distance from the nozzle, versus distance from the nozzle has been found, which took a common form among all geometries and feed materials tested. Therefore, there is some value to simulate air-water flows, first, to …
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Water-in Water (W/W) Emulsion Drug Delivery Systems
… in terms of the polydispersity and/or average droplet sizes of the resulting emulsions. Optical microscopy images were examined to determine the average droplet size in each case. The average droplet size obtained with the syringe pump (~ 20 µm) was larger than that obtained using the …
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Transient behavior of liquid jets injected normal to a high velocity gas stream
… atomization of liquid jets in a crossflow on the size of droplets within the spray plume was experimentally determined. Water and water/methanol mixtures were injected normal to a high velocity air stream at Mach numbers of 0.48 and 3.0 with ambient stagnation temperature and respective stagnation …
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Optimisation of Mare's Tail coalescer technology.
… type of coalescer used in the coalescence of oil droplets that are finely dispersed in the produced water stream with less or no chemicals. This thesis describes the work done under the auspices of the knowledge transfer partnership (KTP) between Opus Plus Ltd. and Robert Gordon University (RGU), …
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Droplet coalescence in the shear flow of model emulsions
During the flow of an emulsion, droplets of the dispersed phase can deform, breakup, coalesce or migrate 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 …
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Design and Experimental Characterization of Electrostatically Assisted Automotive Fuel Injectors
… the spray, Fraunhofer diffraction to measure droplet size, and particle image velocimetry to measure droplet velocities. Results showed application of charge results in increased spray penetration during early injection, increased droplet axial velocities, and reduced spray-to-spray variations …
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