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 27 for “"droplet size distribution"”.
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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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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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Fatores críticos na emulsificação por membranas : caracterização e avaliação do processo
… were varied. Emulsions were characterized for size and droplet size distribution (DSD), besides their stability. Both the morphology and hidrophilycity of the membranes are important to determine the droplets size distribution. Experimental conditions, such as applied pressure and continuous …
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Flow and separation of the oil from compressor discharge to external separator
… techniques in this dissertation. Oil droplets are formed by oil film breakup during the periodic reed valve movement. The oil droplets are then entrained by the refrigerant vapor inside the discharge plenum and leave the compressor to form a mist-annular developing flow in the …
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Numerical modeling of the early stage of cloud formation in a simulation chamber
… been developed to simulate the growth of cloud droplets by condensation upon a spectrum of hygroscopic nuclei. The model is applicable to cloud simulation chamber conditions as well as to the study of the role of these nuclei on cloud base microstructure.</p> <p>Equations are given for the …
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Mixing and Evaporation at the Cloud Edge and Angular Dynamics of Small Crystals in Viscous Flow
… water in atmospheric clouds distributes over droplets of different sizes is important for the initiation of rainfall, and for the optical properties of the atmosphere. Droplet-number densities and droplet-size distributions change rapidly at turbulent cloud edges, where mixing of cloudy and …
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Enhanced Structure and Crystallinity of Semiconducting Polymer Films Through Electrospray Deposition
… stresses as the means of generating charged droplets. The fundamental working principles of electrospray have previously been extensively studied and demonstrated to have monodisperse droplet size distribution, good stability and scalability. Electrospray is a bottom-up deposition method …
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CFD Modelling of the Mixture Preparation in a Modern Gasoline Direct Injection Engine and Correlations with Experimental PN Emissions
… with the Rosin–Rammler (RR) mono-modal droplet size distribution. RD outperformed KH–RT in terms of prediction when comparing numerical spray tip penetration and droplet size characteristics to the experimental counterparts. Then, the modelling protocol incorporated droplet-wall …
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Experimental investigation of liquid fragmentation in hypersonic cross flow
… studied throughout the experimental campaign. Droplet size measurements are analyzed and treated to characterize the atomization process of the liquid jet. The Sauter Mean Diameter and the standard deviation of the droplet size distribution are calculated and presented as a function of location …
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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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The atomisation of detergent slurries
… determine the conditions under which the optimum droplet size distribution (ie., narrowest size range with a minimum of fines and over-sized agglomerates), is generated in sprays from centrifugal pressure nozzles. A range of non-Newtonian detergent slurries were tested but the results are of wider …
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Liquid-vapor phase change phenomena for heat exchangers and electronics cooling
… generation, and water desalination. Jumping-droplet condensation of water has recently been shown to have a 10X heat transfer enhancement compared to state-of-the-art filmwise condensation due to the removal of condensate at much smaller length scales (~ 1µm) than what is capable with …
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Tunable Liquid Crystal Photonic Devices
… nanoscale PDLC device that has inhomogeneous droplet size distribution. In such a PDLC, the inhomogeneous droplet size distribution is obtained by exposing the LC/monomer with a non-uniform ultraviolet (UV) light. An electrically tunable-efficiency Fresnel lens is devised for the first time …
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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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Ambit of Multiphase CFD in Modelling Transport Processes Related to Oil Spill Scenario and Microfluidics
… and presence of local turbulence enhances the droplet disintegration process. The oil droplets contain a plethora of hydrocarbons which are soluble in water. In deep spill scenarios, droplets spend large amounts of time in water column; hence, the dissolution process of soluble hydrocarbons …
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An investigation of the molecular structure, composition and biophysical properties of gum Arabic
… with literature values. The hydrodynamic size of the molecules present in the gums was studied using dynamic light scattering and it was found that molecular association occurred in solution over time which was inhibited in the presence of an electrolyte. The comparison of droplet size …
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Signal sampling and processing in magnetic resonance applications
… is recommended for extracting parameter distributions which are a priori known to be composed of sparse features. $L_1$ regularization is shown to be stable at signal-to-noise ratios < 20 and capable of resolving relaxation time constants and diffusion coefficients which differ by as …
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Unsteady Wetness Effects in Low Pressure Steam Turbines
Accurate prediction of the droplet size distribution in steam turbines is crucial for the correct analysis of wetness losses and other two-phase effects. Measurements taken in the later stages of LP turbines have shown broader size distributions with larger average sizes than those predicted by …
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Improving Evaporative Light Scattering Detector performance using Experiments and Modelling
… index of refraction) to outputs (spray droplet size distribution, light scattering intensity). This study investigates the particle morphology and size distribution of analytes dried through an ELSD by employing multiple particle sizing techniques, including the Phase Doppler Particle …
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Rheologie komplexer Flüssigkeiten
… were evaluated by optical microscopy while droplet size and droplet size distribution were studied by flow particle image analysis (FPIA). 0.3 - 4.0 wt% of hydrophobically modified (hm)-(acrylic acid)copolymers and hm-(poly)urethans were combined with 0.0 - 2.0 wt% low molecular surfactant …
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