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 74 for “"Dispersed Phase"”.
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Dispersed-phase transformation toughening in ultrahigh-strength steels
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1988.
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Oscillating Dispersed-Phase Co-Flow Microfluidic Droplet Generation: Effects on Jet Length and Droplet Size
… regime to an instable jetting regime at high d-phase flow rates. We applied nozzle oscillatory motion to generate an axial shear gradient as well as inducing an additional transverse drag force. We hypothesized that the combined effects of axial and transverse drags can be used for overcoming …
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The influence of the dispersed phase on the convective heat transfer in dispersed flow film boiling
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1990.
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The effect of interfacial compositions on the dispersed phase-induced gelation and controlled digestion of mono and bilayer nanoemulsions
… mono and di-glycerides) removal from the aqueous phase. The removal of excess Citrem increased the viscosity, yield stress and storage moduli of nanoemulsions, more significantly at smaller droplet sizes. It was attributed to a change in inter-droplet interaction from non-DLVO oscillatory …
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Two-phase flows accompanying fires in enclosures
The dispersed phase that accompanies enclosure fires, for example, soot, ash, sprinkler droplets and extinguishing powder, could exert a significant influence on the dynamics of the background fluid. In this thesis, the results of a numerical study into the effects of this dispersed phase on the …
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Liquid-liquid extraction in a pilot scale rotating disc contactor
… effects of drop size, drop size-distribution and dispersed phase hold-up on the performance of the R.D.C. established. The results obtained for the two-phase system C1airso1-water have been compared with published correlations: since most of these correlations are based on data obtained from …
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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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On the reduction of oxygen from dispersed media
The reduction of oxygen from an organic phase dispersed in a concentrated electrolyte is investigated. Dispersed organic phases are used to enhance oxygen transport in fermenters and artificial blood substitutes. This work evaluates the feasibility of using a dispersed organic phase to transport …
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Mechanisms of liquid extraction in a pilot plant sieve plate column
… were studied with the system Clairsol 350 (dispersed) and water.The parameters investigated included jet length, dispersed phase hold-up, coalesced dispersed phase and flocculation zone height beneath the plates, mean drop size and drop size distribution as a function of phase velocities. …
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Liquid-Liquid Extraction in Agitated Contactors Involving Droplet Coalescence and Redispersion
… in terms of the rate of energy imparted to the dispersed phase, and whether contact is stagewise 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 …
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Sintesi e caratterizzazione di nanocompositi aerogel altamente porosi per applicazioni catalitiche
… aerogels, made out of an active nanophase dispersed in a highly porous amorphous silica matrix. These nanocomposites have unique properties which mainly depend on the composition, size and distribution of the nanoparticles and on the morphology and porosity of the matrix. Highly …
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A study on green water problem with dam break model and the BIV technique
… air-water mixture, which includes a continuous phase and a dispersed phase. The continuous phase is explored with the dam break model by three main approaches, namely analytical, experimental and numerical. Analytically, both the Eulerian and Lagrangian Stoker solutions are introduced to study …
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Desulphurisation of iron-carbon melts.
… data indicated two dominant mechanisms, slag phase control followed by dispersed phase control.The initial desulphurisation period was attributed to conditions imposed at the droplet-slag interface by slag phase controlled decarburisation in conjunction with the presence of FeO.A finite carbon …
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Freeze-Casting For Facile Synthesis Of Novel Porous Materials
… porous materials from mixtures comprised of a dispersed phase (colloidal and/or solutal) and a liquid dispersant, typically water. Cooling the mixture to temperatures below the freezing point of water causes nucleation and growth of ice crystals along the thermal gradient. Exclusion of the …
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Large Scale Hydrodynamic Simulations of Emulsions and Foams
… for large scale monodisperse systems, higher dispersed phase volume fractions, and tighter simulation error tolerance. Zinchenko and Davis performed three-dimensional at volume fractions up to 55%. Owing to this limitation, their study exhibited no disorder to order transitions, deviation from …
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Microporous polymeric membranes via melt processing
… glass transition temperature (T_g) of the minor phase. Crazing structure is initiated during the post-step treatments. The dimensions of the crazes are then enlarged by a series of stretching processes that comprise consecutive steps of cold stretching followed by hot stretching. Rates of craze …
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The oxidation of ilmenite: a kinetic study
… (Fe₂Ti₃O₉) and hematite (Fe₂O₃) in a finely dispersed phase at temperatures below about 800°C, with pseudobrookite (Fe₂TiO₅) and rutile (TiO₂) being stable above this temperature.
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A study of liquid-liquid extraction in a sieve plate column
… Important design parameters i.e. flooding, dispersed phase hold-up, drop size distribution, mean drop size, coalescence/flocculation zone height beneath a plate and jetting phenomena were investigated under non-mass transfer and mass transfer conditions in a 0.45m diameter, 2.3m high sieve …
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Properties and foaming behaviour of thermoplastic olefin blends based on linear and branched polypropylene
… blended matrix of linear and branched PP with a dispersed phase of an ethylene-octene copolymer was performed. Blends containing branched PP showed improved stiffness and flexural properties. Given that the morphology and interfacial tension of the blends remain virtually unaffected, these …
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Perturbation Solution of Air-Water Mixture for Jet Noise Reduction
… the underlying jet dynamics. Two classes of multiphase media are examined: a gaseous carrier phase containing dispersed liquid droplets, and a liquid carrier phase containing entrained air bubbles. For both systems, suspended and dispersed regimes are represented through a generalized perturbation …
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