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.
Results
Showing 1 to 20 of 22 for “"droplet growth"”.
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Water droplet growth enhancement through thermal radiation
… explores how thermal radiation affects water droplet growth in the 20 to 100 μm size range. The theory of mass and energy transfer involving thermal radiation for a single droplet is presented. This theory is then extended to predict droplet growth for a given droplet distribution exposed to a …
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A light scattering investigation of droplet growth in nozzle condensation.
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1969.
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Time resolved measurements of droplet growth in a Wilson cloud chamber
"The growth rates of water drops in a Wilson expansion cloud chamber are measured with air, argon and helium as the carrier gas, in the size range of .5 to 10 microns. The drops growing in the supersaturated chamber exhibit oscillations in the scattered intensity as predicted by Mie theory. …
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Modeling and measurement of sodium chloride and ammonium sulfate droplet growth in laminar flow
Cloud droplet growth is governed by a balance between vapor diffusion, Kelvin effect, and Raoult’s law, as expressed in K¨ohler theory. In this study, a thermodynamic droplet growth framework initially developed by Brewster and Li (2021) for radiation-induced cooling of pure water droplets is …
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Droplet growth kinetics on superhydrophobic surfaces and future work on combating cryogenic surface contamination
… first part of this thesis, I discuss my work on droplet growth kinetics during dropwise condensation. Accurate heat transfer predictions during dropwise condensation depend on the growth rates of the condensing droplets. This includes both the heat transfer rate during droplet growth as well as …
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Heat transfer through a condensate droplet on hydrophobic and nanostructured superhydrophobic surfaces
… In this thesis, we reconcile classical droplet growth modeling barriers by utilizing two-dimensional axisymmetric numerical simulations to study individual droplet heat transfer on non-wetting surfaces (90° < θ_a < 170°). Incorporation of an appropriate convective boundary condition at …
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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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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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FoxO1 in the regulation of adipocyte autophagy and biology
… adipocyte biology: (1) to control lipid droplet growth via fat specific protein 27 (FSP27) in adipocytes; and (2) to differentially regulate mitochondrial uncoupling proteins (UCP) that have been implicated in browning of white adipose tissue and redox homeostasis. Mechanistically, FoxO1 …
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Development and characterization of micro/nano structured surfaces for enhanced condensation
… heat transfer performance. We first studied droplet-surface interactions during condensation on superhydrophobic surfaces to understand the emergent droplet wetting morphology. We demonstrated the importance of considering local energy barriers to understand the condensed droplet morphologies …
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Condensation on superhydrophobic copper oxide nanostructures
… driven by surface tension. The increased droplet removal rate and reduced size of departing droplets facilitates improvements over traditional filmwise and dropwise condensation. This work investigates copper oxide nanostructures as a potential substrate for superhydrophobic condensation. …
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Dropwise condensation of water and low surface tension fluids on structured surfaces
… condensation in heat transfer owing to the droplet shedding effects which can efficiently reduce thermal resistance, filmwise condensation still dominates industrial applications currently due to the high costs, low robustness and technical challenges of manufacturing dropwise coatings. …
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Role of Water in the Formation, Transformation and Fate of Secondary Organic Aerosol
… in the suppression of water uptake during droplet growth. Experiments using sulfate particles with different acidity suggest that high molecular weight compounds, formed via acid-catalyzed condensed phase reactions, are the species affecting water uptake kinetics.
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Condensation heat transfer on nanoengineered surfaces
… condensation. Due to their remarkably low droplet adhesion, superhydrophobic surfaces were investigated for application to dropwise condensation. Although precise model superhydrophobic surfaces were necessary to gain insight into these phenomena, it was recognized that wide-scale …
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Radiation-induced condensational growth of cloud-sized mist droplets
Many uncertainties still exist regarding cloud droplet evolution and the production of precipitation from clouds, including the effects of both shortwave and longwave (infrared) thermal radiation. The potential importance of infrared thermal radiation on cloud droplet evolution, particularly at …
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Studies of Turbulent Round Jets Through Experimentation, Simulation, and Modeling
… third problem addressed in this thesis is the growth of liquid droplets by condensation in a turbulent round jet. A vapor-saturated turbulent jet issues into a cold, dry environment. The resulting mixing produces highly inhomogeneous regions of supersaturation, where droplets grow and …
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Localized deformation in soft solids around spherical cavities
… characterization techniques. Driving bubble/droplet growth or contraction provides a way to characterize these materials while avoiding some limitations of traditional techniques. Large deformations in these spherical geometries induce localized deformations at the surface of the cavity. In …
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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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Physically Realistic Rendering of Complex Materials Using Wave optics
… and wave optics to reproduce iridescent water droplets from a cup of hot tea. By qualitative comparisons to photographs, these works demonstrate the importance of integrating wave optics into rendering. In these works, we leverage different computational electromagnetics methods including the …
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Influence of Aerosols During Amine-Based CO2 Capture: Evolution and Control
… was developed to predict the time evolution of droplet growth inside the absorber by solving the general dynamics equation. The coupled model predictions were compared with experiments reported in literature. The model predictions showed that by decreasing amine inlet temperature to the …
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