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 41 for “"Water droplet"”.
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Water droplet growth enhancement through thermal radiation
… thesis 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 …
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Phase-field simulation of freezing water droplet
When a water droplet freezes on a cold plate, a pointy tip forms as the result of volume expansion. In this dissertation, we will introduce a quasi-compressible phase-field model that deals with this non-isothermal three-phase system involving water, ice, and air. The water-ice phase transition and …
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Prediction of water droplet behaviour during fire extinguishment
… the arrival of the fire brigade. As an agent, water has become the most widely used fire suppressant due to its highly effective thermal properties and availability. Specifically, water mist sprays are becoming increasingly popular as total flooding agents, substituting hazardous gaseous …
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Growth rate theory of a single water droplet
Includes bibliographical references (pages 103-104).
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Aircraft Anti-Icing Analysis: Water Droplet Dynamics Under High-Frequency Atomization and Superhydrophobic Effects
… to the weight. Still, complexities arise from water droplets freezing at supercooled levels. A novel approach uses the structure's vibration to induce atomization, a proposed active anti-icing method using high-frequency Piezoelectric Transducer (PZT) vibration and combines it with the passive …
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Impact Dynamics of Water Droplet on Solid Surfaces: Effect of Impact Reynolds Number, Hydrophobicity, Surface Roughness and Temperature
… icing. The impact and freezing process of a water droplet on a cold surface has been investigated over time in order to develop preventative methods for avoiding icing. In the present study, we examined the behavior of a water droplet impacting on an aluminum plate with a surface roughness of …
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Droplet manipulation on structured shape memory polymer surface
… tuning of surface wettability to manipulate water droplets have been widely explored for many applications including digital microfluidics, those based on dynamically changeable surface morphology have remained challenging to achieve. In this work, we present a structured shape memory polymer …
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DEVELOPMENT OF MAGNETIC FABRICS WITH TUNABLE HYDROPHOBICITY
… show that the hydrophobicity (as measured using water droplet contact angle) increases in the presence of a magnetic field and the hysterisis in the advancing/receding contact angle (a measure of the stickiness of the surface) decreases in the presence of a magnetic field. It is also shown that …
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Wireless Dust Sensor Network for a Feedlot Dust Abatement Study
… method of impaction of a dust-air stream into a water droplet capturing images using a low-cost USB microscope. The Box Model was used to calculate the emissions from measured concentrations at a source location and a Gaussian Dispersion Model predicted the concentration at a downwind location. …
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ADDITIVE MANUFACTURING OF SUPERHYDROPHOBIC STAINLESS STEEL COMPOSITES
… hydrodynamic noise as platforms move through the water. This research studied the development of materials that achieve these goals by demonstrating superhydrophobic surface behaviors. Composite materials made up of 316L stainless steel powders and various concentrations of boron nitride nanotubes …
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Heat transfer through a condensate droplet on hydrophobic and nanostructured superhydrophobic surfaces
… is crucial to a wide range of energy and water applications. 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°). …
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Remediation of Soil Hydrophobicity on a Coastal USGA Sand-Based Golf Green
… superintendents and managers, especially as water restrictions intensify. The purpose of this study was to evaluate the effectiveness of thirteen soil surfactants in eliminating LDS and in maximizing root zone soil moisture on a sand based USGA golf green located on the California Central …
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Hydrodynamic and Mass Transport Properties of Microfluidic Geometries
… motion of surfactant-stabilized water droplet pairs in a microchannel as they approach and coalesce under a uniform electric field. Experimental data measuring droplet-droplet separation distance versus time were fitted to a model using the quasi-static force balance between the …
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EM field effects on the surface of polluted HV insulators
… for eventual failure. In this thesis, we examine water droplets on insulator surfaces. Chapter 1 discusses pollution on the surface of high voltage insulators, and chapter 2 considers water droplets on insulator surfaces. Chapter 3 reviews recent work in this area. Chapter 4 presents the aims of …
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Long Time Dynamics of Spherical Objects Governed by Surface Tension
… describes the nonlinear vibration of a spherical water droplet under zero gravity. The equation is legitimately referred as the capillary spherical water waves equation. We develop a toolbox for paradifferential calculus on curved manifolds and prove the local existence for this equation by …
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Self-Assembled Monolayers As Models For Silica
… at the 6-31G* level using commercial software. Water droplet goiniometry found contact angles of 52o, 53o, and 64o for SAMs prepared from 1, 2, and 3, respectively. SAMs of 1 and 2 were found to be hydrophilic. When SAMs prepared from 1, 2, and 3 were silylated with phenyldimethylchlorosilane, …
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Molecular Dynamics Investigation of the Thermodynamics of Nanoscale Droplets and Kinetics of Weakly Correlated Systems
<p>The surface tension of nanoscale droplets of water was studied with molecular dynamics simulations using the BLYPSP-4F water potential. The internal pressure of the droplet was measured using a correlation between the pressure and density, established through a series of bulk simulations …
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Effects of surface parameters on boiling heat transfer phenomena
… coated via boiling induced deposition, CHF of water was found to enhance up to 40% compared to that of the bare tube. This confirms that nanoparticles on the surface is responsible for CHF enhancement for flow boiling. However, existing theories failed to predict the CHF enhancement and the …
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