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 16 of 16 for “"Droplet Coalescence"”.
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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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Liquid-Liquid Extraction in Agitated Contactors Involving Droplet Coalescence and Redispersion
… or differential. In the high energy contactors a droplet coalescence-redispersion mechanism predominates, The literature pertaining to these extractors has been examined and the important phenomena such as droplet break-up and coalescence, phase inversion, mass transfer and backmixing have been …
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Revitalizing Simulations of Colloidal and Interfacial Systems: From Atomistic Trajectories to Data-Centric Insights
… between asphaltene aggregation and water-in-oil droplet coalescence. Molecular Dynamics (MD) simulations conducted in pentane solvents reveal the mutual influences of asphaltene and water droplets, highlighting a nonmonotonic trend in polyaromatic stacking with increasing droplet sizes. An …
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A moving mesh method for non-isothermal multiphase flows
… $Oh$). For the example of a circular/spherical droplet, the interfacial tension and the associated pressure jump are exactly balanced numerically and thus the static Laplace solution exists in our method. The stability of this solution is examined numerically. The amplitude of the dimensionless …
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Effect of composition on empirical stability trends for oil-in-water emulsions
… strength, surfactant type or concentration, droplet size, pH and calcium(II) concentration. Stabilities were measured by droplet size changes, planar interface oil droplet coalescence times, creaming rates and photography. Stability trends between methods were compared. Conclusions were …
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Mercury Amalgam Electrodeposition on Metal Microelectrodes
… Among these local phenomena, nucleation and droplet interactions appear critical. The former sets the formation rate and the size of the isolated mercury droplets that are initially formed at the surface of the electrode. An understanding of the latter is necessary to determine the droplet …
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Numerical Modeling of Deformation, Oscillation, Spreading and Collision Characteristics of Droplets in an Electric Field
… in many fast-growing technologies, where droplet movement and deformation can be controlled to enhance heat transfer and mass transport. Several complex EHD problems existing in many applications were investigated in this thesis. Firstly, this thesis presents the results of numerical …
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A study of lithographic ink and water interactions
… nature of processes at the interface affecting droplet fragmentation, droplet coalescence and time-dependency. Slippage occurred in the hydrophobic systems to a greater extent compared with the hydrophilic systems increasing with water concentrations from 0 to 25% water. Droplet size …
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Multiscale Modelling of Biomolecular Phase Behaviour
… the molecular connectivity inside protein droplets, favouring their stability. In addition, I present a pioneering chemically specific coarse-grained force field for intrinsically disordered proteins that explicitly considers the effect of solvent in phase separation of proteins. I find our …
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Electrostatic charging of jumping droplets on superhydrophobic nanostructured surfaces : fundamental study and applications
… condensation heat transfer, where the low droplet surface adhesion and small droplet departure sizes increase the condensation heat transfer coefficient. Specifically, when two or more small (~10-100 [mu]m) droplets coalesce on a superhydrophobic surface, they can spontaneously jump away …
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Investigation of Asphaltene Adsorption at Liquid-Liquid and Liquid-Solid Interfaces
… interface like the amphiphiles and hinder water droplet coalescence, resulting in the stabilization of water-in-oil emulsions. Also, in the upstream production, depending on the temperature and pressure, asphaltenes can precipitate and deposit onto the reservoir rocks, the wellbores and the …
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Multiphase Flow Dynamics in Confined Domains—A DNS Study of Bubbly, Thermal and Riblet-Induced Turbulence
… enhances heat transfer by up to 10\% due to droplet-induced energy transfer to smaller turbulent scales, even though global turbulence intensity is reduced. Varying viscosity ratios further amplifies mixing: at a volume fraction of 20\% and a viscosity ratio of 10, heat transport rises by …
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Radio frequency plasma synthesis of ultrafine titanium carbide powders
… Ti suboxide particles that then grew by liquid droplet coalescence. Ultrafine cuboid or rhomboid single-crystal particles up to 25 nm across parallel faces were almost always observed and were homogenously nucleated TiCxOz particles with x close to 0.99 and z close to 0 that grew by a gas-solid …
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Multifunktionsfeldeffekttransistoren zur Strömungs-, Chemo- und Biosensorik in Lab on a Chip-Systemen
In dieser Arbeit wird eine neue Methode und ein neuartiges FET -Sensorelement zum Nachweis von Flüssigkeitsbewegungen vorgestellt, das zudem bei Bedarf auch als Chemo- oder Biosensor fungieren kann. Das Einsatzspektrum von FET-basierten Sensoren in Lab on a Chip-Systemen wird dadurch entscheidend …
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Coalescence-induced nanodroplet jumping
Made available in DSpace on 2016-07-07T20:35:12Z (GMT). No. of bitstreams: 2 CHA-THESIS-2016.pdf: 2224018 bytes, checksum: 497c21f5ec14cea688f8b206e81b1b44 (MD5) LICENSE.txt: 4210 bytes, checksum: b076c2ca76ed752c030fdb8c95f208df (MD5) Previous issue date: 2016-04-28
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Enhanced coalescence-induced jumping droplet departure
… in recent years due to its ability to shed water droplets at length scales three decades smaller than the capillary length (~ 1mm) via coalescence induced droplet jumping. Jumping-droplet condensation has been demonstrated to enhance heat transfer, anti-icing, and self-cleaning efficiency, and is …